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Soloviev Z, Bullock JMA, James JMB, Sauerwein AC, Nettleship JE, Owens RJ, Hansen DF, Topf M, Thalassinos K. Structural mass spectrometry decodes domain interaction and dynamics of the full-length Human Histone Deacetylase 2. Biochim Biophys Acta Proteins Proteom 2022; 1870:140759. [PMID: 35051665 PMCID: PMC8825994 DOI: 10.1016/j.bbapap.2022.140759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Accepted: 01/11/2022] [Indexed: 11/30/2022]
Abstract
Human Histone Deacetylase 2 (HDAC2) belongs to a conserved enzyme superfamily that regulates deacetylation inside cells. HDAC2 is a drug target as it is known to be upregulated in cancers and neurodegenerative disorders. It consists of globular deacetylase and C-terminus intrinsically-disordered domains [1-3]. To date, there is no full-length structure of HDAC2 available due to the high intrinsic flexibility of its C-terminal domain. The intrinsically-disordered domain, however, is known to be important for the enzymatic function of HDAC2 [1, 4]. Here we combine several structural Mass Spectrometry (MS) methodologies such as denaturing, native, ion mobility and chemical crosslinking, alongside biochemical assays and molecular modelling to study the structure and dynamics of the full-length HDAC2 for the first time. We show that MS can easily dissect heterogeneity inherent within the protein sample and at the same time probe the structural arrangement of the different conformers present. Activity assays combined with data from MS and molecular modelling suggest how the structural dynamics of the C-terminal domain, and its interactions with the catalytic domain, regulate the activity of this enzyme.
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Affiliation(s)
- Zoja Soloviev
- Institute of Structural and Molecular Biology, Division of Biosciences, University College London, London WC1E 6AR, UK.
| | - Joshua M A Bullock
- Institute of Structural and Molecular Biology, Birkbeck College, University of London, London WC1E 7HX, UK
| | - Juliette M B James
- Institute of Structural and Molecular Biology, Division of Biosciences, University College London, London WC1E 6AR, UK
| | - Andrea C Sauerwein
- Institute of Structural and Molecular Biology, Birkbeck College, University of London, London WC1E 7HX, UK
| | - Joanne E Nettleship
- PPUK, Research Complex at Harwell, Rutherford Appleton Laboratory, Oxford OX11 0FA, UK; Division of Structural Biology, University of Oxford, The Wellcome Centre for Human Genetics, Headington, Oxford, UK
| | - Raymond J Owens
- PPUK, Research Complex at Harwell, Rutherford Appleton Laboratory, Oxford OX11 0FA, UK; Division of Structural Biology, University of Oxford, The Wellcome Centre for Human Genetics, Headington, Oxford, UK
| | - D Flemming Hansen
- Institute of Structural and Molecular Biology, Division of Biosciences, University College London, London WC1E 6AR, UK
| | - Maya Topf
- Institute of Structural and Molecular Biology, Birkbeck College, University of London, London WC1E 7HX, UK; Centre for Structural Systems Biology, Heinrich-Pette-Institut, Leibniz-Institut für Experimentelle Virologie, Hamburg, Germany
| | - Konstantinos Thalassinos
- Institute of Structural and Molecular Biology, Division of Biosciences, University College London, London WC1E 6AR, UK.
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2
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Lukacik P, Owen CD, Harris G, Bolla JR, Picaud S, Alibay I, Nettleship JE, Bird LE, Owens RJ, Biggin PC, Filippakopoulos P, Robinson CV, Walsh MA. The structure of nontypeable Haemophilus influenzae SapA in a closed conformation reveals a constricted ligand-binding cavity and a novel RNA binding motif. PLoS One 2021; 16:e0256070. [PMID: 34653190 PMCID: PMC8519434 DOI: 10.1371/journal.pone.0256070] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Accepted: 07/29/2021] [Indexed: 12/04/2022] Open
Abstract
Nontypeable Haemophilus influenzae (NTHi) is a significant pathogen in respiratory disease and otitis media. Important for NTHi survival, colonization and persistence in vivo is the Sap (sensitivity to antimicrobial peptides) ABC transporter system. Current models propose a direct role for Sap in heme and antimicrobial peptide (AMP) transport. Here, the crystal structure of SapA, the periplasmic component of Sap, in a closed, ligand bound conformation, is presented. Phylogenetic and cavity volume analysis predicts that the small, hydrophobic SapA central ligand binding cavity is most likely occupied by a hydrophobic di- or tri- peptide. The cavity is of insufficient volume to accommodate heme or folded AMPs. Crystal structures of SapA have identified surface interactions with heme and dsRNA. Heme binds SapA weakly (Kd 282 μM) through a surface exposed histidine, while the dsRNA is coordinated via residues which constitute part of a conserved motif (estimated Kd 4.4 μM). The RNA affinity falls within the range observed for characterized RNA/protein complexes. Overall, we describe in molecular-detail the interactions of SapA with heme and dsRNA and propose a role for SapA in the transport of di- or tri-peptides.
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Affiliation(s)
- Petra Lukacik
- Diamond Light Source, Harwell Science & Innovation Campus, Didcot, Oxfordshire, United Kingdom
- Research Complex at Harwell, Harwell Science and Innovation Campus, Didcot, Oxfordshire, United Kingdom
| | - C. David Owen
- Diamond Light Source, Harwell Science & Innovation Campus, Didcot, Oxfordshire, United Kingdom
- Research Complex at Harwell, Harwell Science and Innovation Campus, Didcot, Oxfordshire, United Kingdom
| | - Gemma Harris
- Research Complex at Harwell, Harwell Science and Innovation Campus, Didcot, Oxfordshire, United Kingdom
| | - Jani Reddy Bolla
- Department of Chemistry, University of Oxford, Oxford, United Kingdom
| | - Sarah Picaud
- Structural Genomics Consortium, University of Oxford, Oxford, United Kingdom
| | - Irfan Alibay
- Department of Biochemistry, University of Oxford, Oxford, United Kingdom
| | - Joanne E. Nettleship
- Research Complex at Harwell, Harwell Science and Innovation Campus, Didcot, Oxfordshire, United Kingdom
- Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, United Kingdom
| | - Louise E. Bird
- Research Complex at Harwell, Harwell Science and Innovation Campus, Didcot, Oxfordshire, United Kingdom
- Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, United Kingdom
| | - Raymond J. Owens
- Research Complex at Harwell, Harwell Science and Innovation Campus, Didcot, Oxfordshire, United Kingdom
- Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, United Kingdom
| | - Philip C. Biggin
- Department of Biochemistry, University of Oxford, Oxford, United Kingdom
| | | | - Carol V. Robinson
- Department of Chemistry, University of Oxford, Oxford, United Kingdom
| | - Martin A. Walsh
- Diamond Light Source, Harwell Science & Innovation Campus, Didcot, Oxfordshire, United Kingdom
- Research Complex at Harwell, Harwell Science and Innovation Campus, Didcot, Oxfordshire, United Kingdom
- * E-mail:
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3
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Yassin AA, Alwani M, Talib R, Almehmadi Y, Nettleship JE, Alrumaihi K, Albaba B, Kelly DM, Saad F. Long-term testosterone therapy improves liver parameters and steatosis in hypogonadal men: a prospective controlled registry study. Aging Male 2020; 23:1553-1563. [PMID: 33439074 DOI: 10.1080/13685538.2020.1867094] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) is associated with cardiovascular disease (CVD) and both are prevalent in men with testosterone deficiency. Long-term effects of testosterone therapy (TTh) on NAFLD are not well studied. This observational, prospective, cumulative registry study assesses long-term effects of testosterone undecanoate (TU) on hepatic physiology and function in 505 hypogonadal men (T levels ≤350 ng/dL). Three hundred and twenty one men received TU 1000 mg/12 weeks for up to 12 years following an initial 6-week interval (T-group), while 184 who opted against TTh served as controls (C-group). T-group patients exhibited decreased fatty liver index (FLI, calculated according to Mayo Clinic guidelines) (83.6 ± 12.08 to 66.91 ± 19.38), γ-GT (39.31 ± 11.62 to 28.95 ± 7.57 U/L), bilirubin (1.64 ± 4.13 to 1.21 ± 1.89 mg/dL) and triglycerides (252.35 ± 90.99 to 213 ± 65.91 mg/dL) over 12 years. Waist circumference and body mass index were also reduced in the T-group (107.17 ± 9.64 to 100.34 ± 9.03 cm and 31.51 ± 4.32 to 29.03 ± 3.77 kg/m2). There were 25 deaths (7.8%) in the T-group of which 11 (44%) were cardiovascular related. In contrast, 28 patients (15.2%) died in C-group, and all deaths (100%) were attributed to CVD. These data suggest that long-term TTh improves hepatic steatosis and liver function in hypogonadal men. Improvements in liver function may have contributed to reduced CVD-related mortality.
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Affiliation(s)
- Aksam A Yassin
- Department of Surgery, Division of Urology/Andrology & Men's Health, Hamad Medical Corporation, Doha, Qatar
- Weill Cornell Medical School (WCM-Q), Doha, Qatar
- Center of Medicine and Health Sciences, Dresden International University, Dresden, Germany
- Institute of Urology & Andrology, Andrology Program, Norderstedt, Germany
| | - Mustafa Alwani
- School of Medicine, University of Science and Technology Jordan, Irbid, Jordan
| | - Riadh Talib
- Department of Surgery, Division of Urology/Andrology & Men's Health, Hamad Medical Corporation, Doha, Qatar
- Weill Cornell Medical School (WCM-Q), Doha, Qatar
| | - Yousef Almehmadi
- Institute of Urology & Andrology, Andrology Program, Norderstedt, Germany
- Rabigh Medical College, King Abdulaziz University, Rabigh, Saudi Arabia
| | - Joanne E Nettleship
- Department of Oncology and Metabolism, Medical School, University of Sheffield, Sheffield, UK
| | - Khalid Alrumaihi
- Department of Surgery, Division of Urology/Andrology & Men's Health, Hamad Medical Corporation, Doha, Qatar
- Weill Cornell Medical School (WCM-Q), Doha, Qatar
- Center of Medicine and Health Sciences, Dresden International University, Dresden, Germany
| | - Bassam Albaba
- Center of Medicine and Health Sciences, Dresden International University, Dresden, Germany
| | - Daniel M Kelly
- Department of Oncology and Metabolism, Medical School, University of Sheffield, Sheffield, UK
- Biomolecular Research Centre, Sheffield Hallam University, Sheffield, UK
| | - Farid Saad
- Center of Medicine and Health Sciences, Dresden International University, Dresden, Germany
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4
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Ditsiou A, Cilibrasi C, Simigdala N, Papakyriakou A, Milton-Harris L, Vella V, Nettleship JE, Lo JH, Soni S, Smbatyan G, Ntavelou P, Gagliano T, Iachini MC, Khurshid S, Simon T, Zhou L, Hassell-Hart S, Carter P, Pearl LH, Owen RL, Owens RJ, Roe SM, Chayen NE, Lenz HJ, Spencer J, Prodromou C, Klinakis A, Stebbing J, Giamas G. The structure-function relationship of oncogenic LMTK3. Sci Adv 2020; 6:6/46/eabc3099. [PMID: 33188023 PMCID: PMC7673765 DOI: 10.1126/sciadv.abc3099] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Accepted: 09/30/2020] [Indexed: 05/10/2023]
Abstract
Elucidating signaling driven by lemur tyrosine kinase 3 (LMTK3) could help drug development. Here, we solve the crystal structure of LMTK3 kinase domain to 2.1Å resolution, determine its consensus motif and phosphoproteome, unveiling in vitro and in vivo LMTK3 substrates. Via high-throughput homogeneous time-resolved fluorescence screen coupled with biochemical, cellular, and biophysical assays, we identify a potent LMTK3 small-molecule inhibitor (C28). Functional and mechanistic studies reveal LMTK3 is a heat shock protein 90 (HSP90) client protein, requiring HSP90 for folding and stability, while C28 promotes proteasome-mediated degradation of LMTK3. Pharmacologic inhibition of LMTK3 decreases proliferation of cancer cell lines in the NCI-60 panel, with a concomitant increase in apoptosis in breast cancer cells, recapitulating effects of LMTK3 gene silencing. Furthermore, LMTK3 inhibition reduces growth of xenograft and transgenic breast cancer mouse models without displaying systemic toxicity at effective doses. Our data reinforce LMTK3 as a druggable target for cancer therapy.
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Affiliation(s)
- Angeliki Ditsiou
- Department of Biochemistry and Biomedicine, School of Life Sciences, University of Sussex, Falmer, Brighton BN1 9QG, UK
| | - Chiara Cilibrasi
- Department of Biochemistry and Biomedicine, School of Life Sciences, University of Sussex, Falmer, Brighton BN1 9QG, UK
| | - Nikiana Simigdala
- Center of Basic Research, Biomedical Research Foundation of the Academy of Athens, 11527 Athens, Greece
| | - Athanasios Papakyriakou
- Institute of Biosciences and Applications, National Centre for Scientific Research "Demokritos," 15341 Athens, Greece
| | - Leanne Milton-Harris
- Department of Biochemistry and Biomedicine, School of Life Sciences, University of Sussex, Falmer, Brighton BN1 9QG, UK
| | - Viviana Vella
- Department of Biochemistry and Biomedicine, School of Life Sciences, University of Sussex, Falmer, Brighton BN1 9QG, UK
| | - Joanne E Nettleship
- Division of Structural Biology, University of Oxford, The Wellcome Centre for Human Genetics Headington, Oxford OX3 7BN, UK
- Protein Production UK, Research Complex at Harwell, Harwell Science and Innovation Campus, Didcot OX11 0FA, UK
| | - Jae Ho Lo
- Division of Medical Oncology, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Shivani Soni
- Division of Medical Oncology, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Goar Smbatyan
- Division of Medical Oncology, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Panagiota Ntavelou
- Center of Basic Research, Biomedical Research Foundation of the Academy of Athens, 11527 Athens, Greece
| | - Teresa Gagliano
- Department of Biochemistry and Biomedicine, School of Life Sciences, University of Sussex, Falmer, Brighton BN1 9QG, UK
| | - Maria Chiara Iachini
- Department of Biochemistry and Biomedicine, School of Life Sciences, University of Sussex, Falmer, Brighton BN1 9QG, UK
| | - Sahir Khurshid
- Faculty of Medicine, Division of Systems Medicine, Department of Metabolism, Digestion and Reproduction, Imperial College, Sir Alexander Fleming Building, South Kensington Campus, London SW7 2AZ, UK
| | - Thomas Simon
- Department of Biochemistry and Biomedicine, School of Life Sciences, University of Sussex, Falmer, Brighton BN1 9QG, UK
| | - Lihong Zhou
- Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Science Park Road, Falmer, Brighton BN1 9RQ, UK
| | - Storm Hassell-Hart
- Department of Chemistry, School of Life Sciences, University of Sussex, Falmer, Brighton BN1 9QJ, UK
| | - Philip Carter
- Faculty of Medicine, Department of Surgery and Cancer, Imperial College, London W12 0NN, UK
| | - Laurence H Pearl
- Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Science Park Road, Falmer, Brighton BN1 9RQ, UK
| | - Robin L Owen
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, UK
| | - Raymond J Owens
- Division of Structural Biology, University of Oxford, The Wellcome Centre for Human Genetics Headington, Oxford OX3 7BN, UK
- Protein Production UK, Research Complex at Harwell, Harwell Science and Innovation Campus, Didcot OX11 0FA, UK
- The Rosalind Franklin Institute, Harwell Campus, Didcot OX11 0FA, UK
| | - S Mark Roe
- Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Science Park Road, Falmer, Brighton BN1 9RQ, UK
| | - Naomi E Chayen
- Faculty of Medicine, Division of Systems Medicine, Department of Metabolism, Digestion and Reproduction, Imperial College, Sir Alexander Fleming Building, South Kensington Campus, London SW7 2AZ, UK
| | - Heinz-Josef Lenz
- Division of Medical Oncology, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - John Spencer
- Department of Chemistry, School of Life Sciences, University of Sussex, Falmer, Brighton BN1 9QJ, UK
| | - Chrisostomos Prodromou
- Department of Biochemistry and Biomedicine, School of Life Sciences, University of Sussex, Falmer, Brighton BN1 9QG, UK
| | - Apostolos Klinakis
- Center of Basic Research, Biomedical Research Foundation of the Academy of Athens, 11527 Athens, Greece
| | - Justin Stebbing
- Faculty of Medicine, Department of Surgery and Cancer, Imperial College, London W12 0NN, UK
| | - Georgios Giamas
- Department of Biochemistry and Biomedicine, School of Life Sciences, University of Sussex, Falmer, Brighton BN1 9QG, UK.
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5
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Torini JR, de Freitas Fernandes A, Balasco Serrão VH, Romanello L, Bird LE, Nettleship JE, Owens RJ, Brandão-Neto J, Zeraik AE, DeMarco R, D'Muniz Pereira H. Characterization of a Schistosoma mansoni NDPK expressed in sexual and digestive organs. Mol Biochem Parasitol 2019; 231:111187. [PMID: 31103556 DOI: 10.1016/j.molbiopara.2019.111187] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 05/09/2019] [Accepted: 05/13/2019] [Indexed: 12/20/2022]
Abstract
Nucleoside diphosphate kinases (NDPKs) are crucial to keep the high triphosphate nucleotide levels in the biological process. The enzymatic mechanism has been extensively described; however, the structural characteristics and kinetic parameters have never been fully determined. In Schistosoma mansoni, NDPK (SmNDPK) is directly involved in the pyrimidine and purine salvage pathways, being essential for nucleotide metabolism. The SmNDPK enzymatic activity is the highest of the known purine metabolisms when compared to the mammalian NDPKs, suggesting the importance of this enzyme in the worm metabolism. Here, we report the recombinant expression of SmNDPK that resulted in 1.7 and 1.9 Å apo-form structure in different space-groups, as well as the 2.1 Å SmNDPK.ADP complex. The binding and kinetic assays reveal the ATP-dependence for enzyme activation. Moreover, in situ hybridization showed that SmNDPK transcripts are found in reproductive organs and in the esophagus gland of adult worms, which can be intrinsically related with the oviposition and digestive processes. These results will help us fully understand the crucial participation of this enzyme in Schistosoma mansoni and its importance for the pathology of the disease.
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Affiliation(s)
- Juliana Roberta Torini
- Laboratório de Biologia Estrutural, Instituto de Física de São Carlos, Universidade de São Paulo, 13563-120, São Carlos, SP, Brazil
| | - Adriano de Freitas Fernandes
- Laboratório de Biologia Estrutural, Instituto de Física de São Carlos, Universidade de São Paulo, 13563-120, São Carlos, SP, Brazil
| | - Vitor Hugo Balasco Serrão
- Laboratório de Biologia Estrutural, Instituto de Física de São Carlos, Universidade de São Paulo, 13563-120, São Carlos, SP, Brazil; Department of Medicine Pathobiology, University of Toronto, M5S 1A8, Toronto, Canada.
| | - Larissa Romanello
- Laboratório de Biologia Estrutural, Instituto de Física de São Carlos, Universidade de São Paulo, 13563-120, São Carlos, SP, Brazil
| | - Louise E Bird
- OPPF-UK, Research Complex at Harwell, Rutherford Appleton Laboratory, Oxford, OX11 0FA, UK
| | - Joanne E Nettleship
- OPPF-UK, Research Complex at Harwell, Rutherford Appleton Laboratory, Oxford, OX11 0FA, UK
| | - Raymond J Owens
- OPPF-UK, Research Complex at Harwell, Rutherford Appleton Laboratory, Oxford, OX11 0FA, UK
| | - José Brandão-Neto
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, UK
| | - Ana Eliza Zeraik
- Laboratório de Biologia Estrutural, Instituto de Física de São Carlos, Universidade de São Paulo, 13563-120, São Carlos, SP, Brazil
| | - Ricardo DeMarco
- Laboratório de Biologia Estrutural, Instituto de Física de São Carlos, Universidade de São Paulo, 13563-120, São Carlos, SP, Brazil
| | - Humberto D'Muniz Pereira
- Laboratório de Biologia Estrutural, Instituto de Física de São Carlos, Universidade de São Paulo, 13563-120, São Carlos, SP, Brazil
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6
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Ren J, Nettleship JE, Harris G, Mwangi W, Rhaman N, Grant C, Kotecha A, Fry E, Charleston B, Stuart DI, Hammond J, Owens RJ. The role of the light chain in the structure and binding activity of two cattle antibodies that neutralize bovine respiratory syncytial virus. Mol Immunol 2019; 112:123-130. [PMID: 31100550 PMCID: PMC6677920 DOI: 10.1016/j.molimm.2019.04.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 04/10/2019] [Accepted: 04/29/2019] [Indexed: 12/22/2022]
Abstract
The Fab structures of two cattle antibodies (B4 and B13) that neutralise bRSV have been solved. The light chain plays a critical role in the folding and positioning of CDR H3 of the heavy chains. The H3 loop plays a dominant role in antigen-binding.
Cattle antibodies have unusually long CDR3 loops in their heavy chains (HCs), and limited light chain (LC) diversity, raising the question of whether these mask the effect of LC variation on antigen recognition. We have investigated the role of the LC in the structure and activity of two neutralizing cattle antibodies (B4 and B13) that bind the F protein of bovine respiratory syncytial virus (bRSV). Recombinant Fab fragments of B4 and B13 bound bRSV infected cells and showed similar affinities for purified bRSV F protein. Exchanging the LCs between the Fab fragments produced hybrid Fabs: B13* (B13 HC/B4 LC) and B4* (B4 HC/B13 LC). The affinity of B13* to the F protein was found to be two-fold lower than B13 whilst the binding affinity of B4* was reduced at least a hundred-fold compared to B4 such that it no longer bound to bRSV infected cells. Comparison of the structures of B4 and B13 with their LC exchanged counterparts B4* and B13* showed that paratope of the HC variable domain (VH) of B4 was disrupted on pairing with the B13 LC, consistent with the loss of binding activity. By contrast, B13 H3 adopts a similar conformation when paired with either B13 or B4 LCs. These observations confirm the expected key role of the extended H3 loop in antigen-binding by cattle antibodies but also show that the quaternary LC/HC subunit interaction can be crucial for its presentation and thus the LC variable domain (VL) is also important for antigen recognition.
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Affiliation(s)
- Jingshan Ren
- The Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, Roosevelt Drive, Oxford, OX3 7BN, UK
| | - Joanne E Nettleship
- The Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, Roosevelt Drive, Oxford, OX3 7BN, UK; Research Complex at Harwell, R92 Rutherford Appleton Laboratory, Didcot, OX11 0FA, UK
| | - Gemma Harris
- Research Complex at Harwell, R92 Rutherford Appleton Laboratory, Didcot, OX11 0FA, UK
| | - William Mwangi
- The Pirbright Institute, Ash Road, Pirbright, Woking, GU24 0NF, UK
| | - Nahid Rhaman
- The Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, Roosevelt Drive, Oxford, OX3 7BN, UK; Research Complex at Harwell, R92 Rutherford Appleton Laboratory, Didcot, OX11 0FA, UK
| | - Clare Grant
- The Pirbright Institute, Ash Road, Pirbright, Woking, GU24 0NF, UK
| | - Abhay Kotecha
- The Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, Roosevelt Drive, Oxford, OX3 7BN, UK
| | - Elizabeth Fry
- The Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, Roosevelt Drive, Oxford, OX3 7BN, UK
| | - Bryan Charleston
- The Pirbright Institute, Ash Road, Pirbright, Woking, GU24 0NF, UK
| | - David I Stuart
- The Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, Roosevelt Drive, Oxford, OX3 7BN, UK
| | - John Hammond
- The Pirbright Institute, Ash Road, Pirbright, Woking, GU24 0NF, UK
| | - Raymond J Owens
- The Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, Roosevelt Drive, Oxford, OX3 7BN, UK; Research Complex at Harwell, R92 Rutherford Appleton Laboratory, Didcot, OX11 0FA, UK.
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7
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Awanye AM, Chang CM, Wheeler JX, Chan H, Marsay L, Dold C, Rollier CS, Bird LE, Nettleship JE, Owens RJ, Pollard AJ, Derrick JP. Immunogenicity profiling of protein antigens from capsular group B Neisseria meningitidis. Sci Rep 2019; 9:6843. [PMID: 31048732 PMCID: PMC6497663 DOI: 10.1038/s41598-019-43139-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Accepted: 04/11/2019] [Indexed: 11/29/2022] Open
Abstract
Outer membrane vesicle (OMV)- based vaccines have been used to provide strain-specific protection against capsular group B Neisseria meningitidis infections, but the full breadth of the immune response against the components of the OMV has not been established. Sera from adults vaccinated with an OMV vaccine were used to screen 91 outer membrane proteins (OMPs) incorporated in an antigen microarray panel. Antigen-specific IgG levels were quantified pre-vaccination, and after 12 and 18 weeks. These results were compared with IgG levels from mice vaccinated with the same OMV vaccine. The repertoires of highly responding antigens in humans and mice overlapped, but were not identical. The highest responding antigens to human IgG comprised four integral OMPs (PorA, PorB, OpcA and PilQ), a protein which promotes the stability of PorA and PorB (RmpM) and two lipoproteins (BamC and GNA1162). These observations will assist in evaluating the role of minor antigen components within OMVs in providing protection against meningococcal infection. In addition, the relative dominance of responses to integral OMPs in humans emphasizes the importance of this subclass and points to the value of maintaining conformational epitopes from integral membrane proteins in vaccine formulations.
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Affiliation(s)
- Amaka M Awanye
- Lydia Becker Institute of Immunology and Inflammation, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, M13 9PL, UK
| | - Chun-Mien Chang
- Lydia Becker Institute of Immunology and Inflammation, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, M13 9PL, UK
| | - Jun X Wheeler
- National Institute for Biological Standards and Control, Blanche Lane, South Mimms, Hertfordshire, EN6 3QG, UK
| | - Hannah Chan
- National Institute for Biological Standards and Control, Blanche Lane, South Mimms, Hertfordshire, EN6 3QG, UK
| | - Leanne Marsay
- Oxford Vaccine Group, Department of Paediatrics, University of Oxford, and the NIHR Oxford Biomedical Research Centre, Oxford, OX3 7LE, UK
| | - Christina Dold
- Oxford Vaccine Group, Department of Paediatrics, University of Oxford, and the NIHR Oxford Biomedical Research Centre, Oxford, OX3 7LE, UK
| | - Christine S Rollier
- Oxford Vaccine Group, Department of Paediatrics, University of Oxford, and the NIHR Oxford Biomedical Research Centre, Oxford, OX3 7LE, UK
| | - Louise E Bird
- Oxford Protein Production Facility, Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Didcot, OX11 0FA, UK
| | - Joanne E Nettleship
- Oxford Protein Production Facility, Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Didcot, OX11 0FA, UK
| | - Raymond J Owens
- Oxford Protein Production Facility, Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Didcot, OX11 0FA, UK
| | - Andrew J Pollard
- Oxford Vaccine Group, Department of Paediatrics, University of Oxford, and the NIHR Oxford Biomedical Research Centre, Oxford, OX3 7LE, UK
| | - Jeremy P Derrick
- Lydia Becker Institute of Immunology and Inflammation, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, M13 9PL, UK.
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8
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Abstract
Production of high quality protein is an essential step for both structural and functional studies. Throughput has increased in the past decade by the use of streamlined workflows with standard operating procedures and automation. In this chapter, we describe the Oxford Protein Production Facility (OPPF) pipeline for protein production, from conception, through vector construction, to expression and purification. Results from projects run in the OPPF demonstrate the value of using parallel expression screening of intracellular proteins in both E. coli and insect cells. Transient expression in Human Embryonic Kidney (HEK) cells is used exclusively for production of secreted glycoproteins. Protein purification and quality assessment are independent of the expression system and enable sample preparation to be simplified and streamlined.
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Affiliation(s)
- Joanne E Nettleship
- Research Complex at Harwell, Rutherford Appleton Laboratory Harwell Oxford, Oxford, UK
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Oxford, UK
| | - Heather Rada
- Research Complex at Harwell, Rutherford Appleton Laboratory Harwell Oxford, Oxford, UK
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Oxford, UK
| | - Raymond J Owens
- Research Complex at Harwell, Rutherford Appleton Laboratory Harwell Oxford, Oxford, UK.
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Oxford, UK.
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9
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Kim YC, Lopez-Camacho C, Nettleship JE, Rahman N, Hill ML, Silva-Reyes L, Ortiz-Martinez G, Figueroa-Aguilar G, Mar MA, Vivanco-Cid H, Rollier CS, Zitzmann N, Viveros-Sandoval ME, Owens RJ, Reyes-Sandoval A. Optimization of Zika virus envelope protein production for ELISA and correlation of antibody titers with virus neutralization in Mexican patients from an arbovirus endemic region. Virol J 2018; 15:193. [PMID: 30587198 PMCID: PMC6307127 DOI: 10.1186/s12985-018-1104-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Accepted: 12/04/2018] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND Zika virus (ZIKV) has become a global threat with immediate need for accurate diagnostics, efficacious vaccines and therapeutics. Several ZIKV envelope (Env)-based vaccines have been developed recently. However, many commercially available ZIKV Env are based on the African lineage and produced in insect cells. Here, we sought to produce Asian-lineage ZIKV Env in mammalian cells for research and clinical applications. METHODS We designed various gene expression constructs to optimize the production of ZIKV using prM-Env and full or C-terminal truncations of Env; with or without a rat CD4 fusion partner to allow large-scale production of soluble protein in mammalian HEK293 cells. Protein expression was verified by mass spectrometry and western-blot with a pan-flavivirus antibody, a ZIKV Env monoclonal antibody and with immune sera from adenoviral (ChAdOx1) ZIKV Env-vaccinated mice. The resulting Env-CD4 was used as a coating reagent for immunoassay (ELISA) using both mouse and human seropositive sera. RESULTS Replacement of the C-terminus transmembrane Env domain by a rat CD4 and addition of prM supported optimal expression and secretion of Env. Binding between the antigens and the antibodies was similar to binding when using commercially available ZIKV Env reagents. Furthermore, antibodies from ZIKV patients bound ZIKV Env-CD4 in ELISA assays, whereas sera from healthy blood donors yielded minimal OD background. The serological outcomes of this assay correlated also with ZIKV neutralisation capacity in vitro. CONCLUSIONS Results obtained from this study indicate the potential of the Asian-lineage Zika Env-CD4 and Env proteins in ELISA assays to monitor humoral immune responses in upcoming clinical trials as well as a sero-diagnostic tool in ZIKV infection.
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Affiliation(s)
- Young Chan Kim
- The Jenner Institute, Nuffield Department of Medicine, The Henry Wellcome Building for Molecular Physiology, University of Oxford, Old Road Campus Research Building. Roosevelt Drive, Oxford, OX3 7DQ, UK.,Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford, UK
| | - Cesar Lopez-Camacho
- The Jenner Institute, Nuffield Department of Medicine, The Henry Wellcome Building for Molecular Physiology, University of Oxford, Old Road Campus Research Building. Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Joanne E Nettleship
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford, UK.,Rutherford Appleton Laboratory, OPPF-UK, Research Complex at Harwell, Oxford, UK
| | - Nahid Rahman
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford, UK.,Rutherford Appleton Laboratory, OPPF-UK, Research Complex at Harwell, Oxford, UK
| | - Michelle L Hill
- Oxford Glycobiology Institute, Department of Biochemistry, University of Oxford, South Parks Road, Oxford, OX1 3QU, UK
| | - Laura Silva-Reyes
- Oxford Vaccine Group, Department of Paediatrics, University of Oxford and the NIHR Oxford Biomedical Research Centre, Centre for Clinical Vaccinology and Tropical Medicine, Churchill Hospital, Oxford, UK
| | - Georgina Ortiz-Martinez
- Laboratorio de Hemostasia y Biología Vascular. División de Estudios de Posgrado. Facultad de Ciencias Médicas y Biológicas "Dr. Ignacio Chávez", Universidad Michoacana de San Nicolás de Hidalgo, UMSNH, Morelia, Mexico.,UMSNH-Oxford University of Oxford Clinical Research Laboratory (UMOCRL), Faculty of Biological and Medical Sciences "Dr. Ignacio Chávez", Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico
| | - Gloria Figueroa-Aguilar
- Laboratorio Estatal de Salud Pública, Secretaría de Salud de Michoacán, Morelia, Michoacán, Mexico
| | - María Antonieta Mar
- HGZMF No. 12 Lázaro Cárdenas Michoacán dirección av. Lázaro Cárdenas No. 154 Col. Centro Lázaro Cárdenas Michoacán, Veracruz, Mexico
| | - Héctor Vivanco-Cid
- Instituto de Investigaciones Médico-Biológicas, Universidad Veracruzana, Veracruz, Mexico
| | - Christine S Rollier
- Oxford Vaccine Group, Department of Paediatrics, University of Oxford and the NIHR Oxford Biomedical Research Centre, Centre for Clinical Vaccinology and Tropical Medicine, Churchill Hospital, Oxford, UK
| | - Nicole Zitzmann
- Oxford Glycobiology Institute, Department of Biochemistry, University of Oxford, South Parks Road, Oxford, OX1 3QU, UK
| | - Martha Eva Viveros-Sandoval
- Laboratorio de Hemostasia y Biología Vascular. División de Estudios de Posgrado. Facultad de Ciencias Médicas y Biológicas "Dr. Ignacio Chávez", Universidad Michoacana de San Nicolás de Hidalgo, UMSNH, Morelia, Mexico.,UMSNH-Oxford University of Oxford Clinical Research Laboratory (UMOCRL), Faculty of Biological and Medical Sciences "Dr. Ignacio Chávez", Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico
| | - Raymond J Owens
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford, UK.,Rutherford Appleton Laboratory, OPPF-UK, Research Complex at Harwell, Oxford, UK
| | - Arturo Reyes-Sandoval
- The Jenner Institute, Nuffield Department of Medicine, The Henry Wellcome Building for Molecular Physiology, University of Oxford, Old Road Campus Research Building. Roosevelt Drive, Oxford, OX3 7DQ, UK.
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10
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Yogavel M, Nettleship JE, Sharma A, Harlos K, Jamwal A, Chaturvedi R, Sharma M, Jain V, Chhibber-Goel J, Sharma A. Structure of 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase-dihydropteroate synthase from Plasmodium vivax sheds light on drug resistance. J Biol Chem 2018; 293:14962-14972. [PMID: 30104413 DOI: 10.1074/jbc.ra118.004558] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 08/08/2018] [Indexed: 11/06/2022] Open
Abstract
The genomes of the malaria-causing Plasmodium parasites encode a protein fused of 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase (HPPK) and dihydropteroate synthase (DHPS) domains that catalyze sequential reactions in the folate biosynthetic pathway. Whereas higher organisms derive folate from their diet and lack the enzymes for its synthesis, most eubacteria and a number of lower eukaryotes including malaria parasites synthesize tetrahydrofolate via DHPS. Plasmodium falciparum (Pf) and Plasmodium vivax (Pv) HPPK-DHPSs are currently targets of drugs like sulfadoxine (SDX). The SDX effectiveness as an antimalarial drug is increasingly diminished by the rise and spread of drug-resistant mutations. Here, we present the crystal structure of PvHPPK-DHPS in complex with four substrates/analogs, revealing the bifunctional PvHPPK-DHPS architecture in an unprecedented state of enzymatic activation. SDX's effect on HPPK-DHPS is due to 4-amino benzoic acid (pABA) mimicry, and the PvHPPK-DHPS structure sheds light on the SDX-binding cavity, as well as on mutations that effect SDX potency. We mapped five dominant drug resistance mutations in PvHPPK-DHPS: S382A, A383G, K512E/D, A553G, and V585A, most of which occur individually or in clusters proximal to the pABA-binding site. We found that these resistance mutations subtly alter the intricate enzyme/pABA/SDX interactions such that DHPS affinity for pABA is diminished only moderately, but its affinity for SDX is changed substantially. In conclusion, the PvHPPK-DHPS structure rationalizes and unravels the structural bases for SDX resistance mutations and highlights architectural features in HPPK-DHPSs from malaria parasites that can form the basis for developing next-generation anti-folate agents to combat malaria parasites.
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Affiliation(s)
- Manickam Yogavel
- From the Molecular Medicine-Structural Parasitology Group, International Centre for Genetic Engineering and Biotechnology, New Delhi 110067, India,
| | - Joanne E Nettleship
- the Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, United Kingdom, and.,the Oxford Protein Production Facility, United Kingdom Research Complex at Harwell, Rutherford Appleton Laboratory, Oxford OX11 0FA, United Kingdom
| | - Akansha Sharma
- From the Molecular Medicine-Structural Parasitology Group, International Centre for Genetic Engineering and Biotechnology, New Delhi 110067, India
| | - Karl Harlos
- the Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, United Kingdom, and
| | - Abhishek Jamwal
- From the Molecular Medicine-Structural Parasitology Group, International Centre for Genetic Engineering and Biotechnology, New Delhi 110067, India
| | - Rini Chaturvedi
- From the Molecular Medicine-Structural Parasitology Group, International Centre for Genetic Engineering and Biotechnology, New Delhi 110067, India
| | - Manmohan Sharma
- From the Molecular Medicine-Structural Parasitology Group, International Centre for Genetic Engineering and Biotechnology, New Delhi 110067, India
| | - Vitul Jain
- the Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, United Kingdom, and
| | - Jyoti Chhibber-Goel
- From the Molecular Medicine-Structural Parasitology Group, International Centre for Genetic Engineering and Biotechnology, New Delhi 110067, India
| | - Amit Sharma
- From the Molecular Medicine-Structural Parasitology Group, International Centre for Genetic Engineering and Biotechnology, New Delhi 110067, India
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11
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Hannon C, Cruz-Migoni A, Platonova O, Owen RL, Nettleship JE, Miller A, Carr SB, Harris G, Rabbitts TH, Phillips SEV. Cloning, purification and structure determination of the HIV integrase-binding domain of lens epithelium-derived growth factor. Acta Crystallogr F Struct Biol Commun 2018; 74:143-149. [PMID: 29497017 PMCID: PMC5947699 DOI: 10.1107/s2053230x18001553] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Accepted: 01/23/2018] [Indexed: 12/04/2022] Open
Abstract
Lens epithelium-derived growth factor (LEDGF)/p75 is the dominant binding partner of HIV-1 integrase in human cells. The crystal structure of the HIV integrase-binding domain (IBD) of LEDGF has been determined in the absence of ligand. IBD was overexpressed in Escherichia coli, purified and crystallized by sitting-drop vapour diffusion. X-ray diffraction data were collected at Diamond Light Source to a resolution of 2.05 Å. The crystals belonged to space group P21, with eight polypeptide chains in the asymmetric unit arranged as an unusual octamer composed of four domain-swapped IBD dimers. IBD exists as a mixture of monomers and dimers in concentrated solutions, but the dimers are unlikely to be biologically relevant.
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Affiliation(s)
- Clare Hannon
- Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DS, England
- West Suffolk Hospital, Hardwick Lane, Bury St Edmunds IP33 2QZ, England
| | - Abimael Cruz-Migoni
- Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DS, England
| | - Olga Platonova
- Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DS, England
| | - Robin L. Owen
- Diamond Light Source, Rutherford Appleton Laboratory, Didcot OX11 0DE, England
| | - Joanne E. Nettleship
- Oxford Protein Production Facility, Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot OX11 0FA, England
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, England
| | - Ami Miller
- Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DS, England
| | - Stephen B. Carr
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, England
- Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot OX11 0FA, England
| | - Gemma Harris
- Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot OX11 0FA, England
| | - Terence H. Rabbitts
- Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DS, England
| | - Simon E. V. Phillips
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, England
- Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot OX11 0FA, England
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12
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Tiede C, Bedford R, Heseltine SJ, Smith G, Wijetunga I, Ross R, AlQallaf D, Roberts APE, Balls A, Curd A, Hughes RE, Martin H, Needham SR, Zanetti-Domingues LC, Sadigh Y, Peacock TP, Tang AA, Gibson N, Kyle H, Platt GW, Ingram N, Taylor T, Coletta LP, Manfield I, Knowles M, Bell S, Esteves F, Maqbool A, Prasad RK, Drinkhill M, Bon RS, Patel V, Goodchild SA, Martin-Fernandez M, Owens RJ, Nettleship JE, Webb ME, Harrison M, Lippiat JD, Ponnambalam S, Peckham M, Smith A, Ferrigno PK, Johnson M, McPherson MJ, Tomlinson DC. Affimer proteins are versatile and renewable affinity reagents. eLife 2017; 6:e24903. [PMID: 28654419 PMCID: PMC5487212 DOI: 10.7554/elife.24903] [Citation(s) in RCA: 121] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Accepted: 06/07/2017] [Indexed: 12/11/2022] Open
Abstract
Molecular recognition reagents are key tools for understanding biological processes and are used universally by scientists to study protein expression, localisation and interactions. Antibodies remain the most widely used of such reagents and many show excellent performance, although some are poorly characterised or have stability or batch variability issues, supporting the use of alternative binding proteins as complementary reagents for many applications. Here we report on the use of Affimer proteins as research reagents. We selected 12 diverse molecular targets for Affimer selection to exemplify their use in common molecular and cellular applications including the (a) selection against various target molecules; (b) modulation of protein function in vitro and in vivo; (c) labelling of tumour antigens in mouse models; and (d) use in affinity fluorescence and super-resolution microscopy. This work shows that Affimer proteins, as is the case for other alternative binding scaffolds, represent complementary affinity reagents to antibodies for various molecular and cell biology applications.
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Affiliation(s)
- Christian Tiede
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
- Astbury Centre for Structural and Molecular Biology, University of Leeds, Leeds, United Kingdom
| | - Robert Bedford
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
- Astbury Centre for Structural and Molecular Biology, University of Leeds, Leeds, United Kingdom
| | - Sophie J Heseltine
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
- Astbury Centre for Structural and Molecular Biology, University of Leeds, Leeds, United Kingdom
| | - Gina Smith
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
| | - Imeshi Wijetunga
- Leeds Institute of Cancer Studies and Pathology, University of Leeds, Leeds, United Kingdom
| | - Rebecca Ross
- Leeds Institute of Cancer Studies and Pathology, University of Leeds, Leeds, United Kingdom
| | - Danah AlQallaf
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
| | | | - Alexander Balls
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
| | - Alistair Curd
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
| | - Ruth E Hughes
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
| | - Heather Martin
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
| | - Sarah R Needham
- Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
| | - Laura C Zanetti-Domingues
- Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
| | | | | | - Anna A Tang
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
| | - Naomi Gibson
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
| | - Hannah Kyle
- Avacta Life Sciences, Wetherby, United Kingdom
| | | | - Nicola Ingram
- Leeds Institute of Cancer Studies and Pathology, University of Leeds, Leeds, United Kingdom
| | - Thomas Taylor
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
| | - Louise P Coletta
- Leeds Institute of Cancer Studies and Pathology, University of Leeds, Leeds, United Kingdom
| | - Iain Manfield
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
- Astbury Centre for Structural and Molecular Biology, University of Leeds, Leeds, United Kingdom
| | - Margaret Knowles
- Leeds Institute of Cancer Studies and Pathology, University of Leeds, Leeds, United Kingdom
| | - Sandra Bell
- Leeds Institute of Biomedical and Clinical Sciences, University of Leeds, Leeds, United Kingdom
| | - Filomena Esteves
- Leeds Institute of Cancer Studies and Pathology, University of Leeds, Leeds, United Kingdom
| | - Azhar Maqbool
- Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds, United Kingdom
| | - Raj K Prasad
- Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds, United Kingdom
| | - Mark Drinkhill
- Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds, United Kingdom
| | - Robin S Bon
- Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds, United Kingdom
| | | | | | - Marisa Martin-Fernandez
- Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
| | - Ray J Owens
- Oxford Protein Production Facility UK, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
| | - Joanne E Nettleship
- Oxford Protein Production Facility UK, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
| | - Michael E Webb
- School of Chemistry, University of Leeds, Leeds, United Kingdom
| | - Michael Harrison
- School of Biomedical Sciences, University of Leeds, Leeds, United Kingdom
| | - Jonathan D Lippiat
- School of Biomedical Sciences, University of Leeds, Leeds, United Kingdom
| | - Sreenivasan Ponnambalam
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
- Astbury Centre for Structural and Molecular Biology, University of Leeds, Leeds, United Kingdom
| | - Michelle Peckham
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
- Astbury Centre for Structural and Molecular Biology, University of Leeds, Leeds, United Kingdom
| | | | | | | | - Michael J McPherson
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
- Astbury Centre for Structural and Molecular Biology, University of Leeds, Leeds, United Kingdom
| | - Darren Charles Tomlinson
- School of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom
- Astbury Centre for Structural and Molecular Biology, University of Leeds, Leeds, United Kingdom
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13
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Palazzo L, Daniels CM, Nettleship JE, Rahman N, McPherson RL, Ong S, Kato K, Nureki O, Leung AKL, Ahel I. ENPP1 processes protein ADP-ribosylation in vitro. FEBS J 2016; 283:3371-88. [PMID: 27406238 PMCID: PMC5030157 DOI: 10.1111/febs.13811] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 06/27/2016] [Accepted: 07/11/2016] [Indexed: 12/30/2022]
Abstract
ADP-ribosylation is a conserved post-translational protein modification that plays a role in all major cellular processes, particularly DNA repair, transcription, translation, stress response and cell death. Hence, dysregulation of ADP-ribosylation is linked to the physiopathology of several human diseases including cancers, diabetes and neurodegenerative disorders. Protein ADP-ribosylation can be reversed by the macrodomain-containing proteins PARG, TARG1, MacroD1 and MacroD2, which hydrolyse the ester bond known to link proteins to ADP-ribose as well as consecutive ADP-ribose subunits; targeting this bond can thus result in the complete removal of the protein modification or the conversion of poly(ADP-ribose) to mono(ADP-ribose). Recently, proteins containing the NUDIX domain - namely human NUDT16 and bacterial RppH - have been shown to process in vitro protein ADP-ribosylation through an alternative mechanism, converting it into protein-conjugated ribose-5'-phosphate (R5P, also known as pR). Though this protein modification was recently identified in mammalian tissues, its physiological relevance and the mechanism of generating protein phosphoribosylation are currently unknown. Here, we identified ectonucleotide pyrophosphatase/phosphodiesterase 1 (ENPP1) as the first known mammalian enzyme lacking a NUDIX domain to generate pR from ADP-ribose on modified proteins in vitro. Thus, our data show that at least two enzyme families - Nudix and ENPP/NPP - are able to metabolize protein-conjugated ADP-ribose to pR in vitro, suggesting that pR exists and may be conserved from bacteria to mammals. We also demonstrate the utility of ENPP1 for converting protein-conjugated mono(ADP-ribose) and poly(ADP-ribose) into mass spectrometry-friendly pR tags, thus facilitating the identification of ADP-ribosylation sites.
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Affiliation(s)
- Luca Palazzo
- Sir William Dunn School of PathologyUniversity of OxfordUK
| | - Casey M. Daniels
- Department of Biochemistry and Molecular BiologyBloomberg School of Public HealthJohns Hopkins UniversityBaltimoreMDUSA,Present address: Laboratory of Systems BiologyNational Institute of Allergy and Infectious DiseasesNational Institutes of HealthBethesdaMD20892USA
| | - Joanne E. Nettleship
- OPPF‐UKThe Research Complex at HarwellRutherford Appleton LaboratoryHarwell OxfordUK,Division of Structural BiologyHenry Wellcome Building for Genomic MedicineUniversity of OxfordUK
| | - Nahid Rahman
- OPPF‐UKThe Research Complex at HarwellRutherford Appleton LaboratoryHarwell OxfordUK,Division of Structural BiologyHenry Wellcome Building for Genomic MedicineUniversity of OxfordUK
| | - Robert Lyle McPherson
- Department of Biochemistry and Molecular BiologyBloomberg School of Public HealthJohns Hopkins UniversityBaltimoreMDUSA
| | - Shao‐En Ong
- Department of PharmacologyUniversity of WashingtonSeattleWAUSA
| | - Kazuki Kato
- Department of Biophysics and BiochemistryGraduate School of ScienceThe University of TokyoJapan
| | - Osamu Nureki
- Department of Biophysics and BiochemistryGraduate School of ScienceThe University of TokyoJapan
| | - Anthony K. L. Leung
- Department of Biochemistry and Molecular BiologyBloomberg School of Public HealthJohns Hopkins UniversityBaltimoreMDUSA,Department of OncologyJohns Hopkins University School of MedicineBaltimoreMDUSA
| | - Ivan Ahel
- Sir William Dunn School of PathologyUniversity of OxfordUK
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14
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Valente M, Timm J, Castillo-Acosta VM, Ruiz-Pérez LM, Balzarini T, Nettleship JE, Bird LE, Rada H, Wilson KS, González-Pacanowska D. Cell cycle regulation and novel structural features of thymidine kinase, an essential enzyme in Trypanosoma brucei. Mol Microbiol 2016; 102:365-385. [PMID: 27426054 DOI: 10.1111/mmi.13467] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/17/2016] [Indexed: 11/28/2022]
Abstract
Thymidine kinase (TK) is a key enzyme in the pyrimidine salvage pathway which catalyzes the transfer of the γ-phosphate of ATP to 2'-deoxythymidine (dThd) forming thymidine monophosphate (dTMP). Unlike other type II TKs, the Trypanosoma brucei enzyme (TbTK) is a tandem protein with two TK homolog domains of which only the C-terminal one is active. In this study, we establish that TbTK is essential for parasite viability and cell cycle progression, independently of extracellular pyrimidine concentrations. We show that expression of TbTK is cell cycle regulated and that depletion of TbTK leads to strongly diminished dTTP pools and DNA damage indicating intracellular dThd to be an essential intermediate metabolite for the synthesis of thymine-derived nucleotides. In addition, we report the X-ray structure of the catalytically active domain of TbTK in complex with dThd and dTMP at resolutions up to 2.2 Å. In spite of the high conservation of the active site residues, the structures reveal a widened active site cavity near the nucleobase moiety compared to the human enzyme. Our findings strongly support TbTK as a crucial enzyme in dTTP homeostasis and identify structural differences within the active site that could be exploited in the process of rational drug design.
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Affiliation(s)
- Maria Valente
- Instituto de Parasitología y Biomedicina "López-Neyra", Consejo Superior de Investigaciones Científicas, Granada, Spain
| | - Jennifer Timm
- York Structural Biology Laboratory, Department of Chemistry, University of York, York, YO10 5DD, UK
| | - Víctor M Castillo-Acosta
- Instituto de Parasitología y Biomedicina "López-Neyra", Consejo Superior de Investigaciones Científicas, Granada, Spain
| | - Luis M Ruiz-Pérez
- Instituto de Parasitología y Biomedicina "López-Neyra", Consejo Superior de Investigaciones Científicas, Granada, Spain
| | - Tom Balzarini
- Instituto de Parasitología y Biomedicina "López-Neyra", Consejo Superior de Investigaciones Científicas, Granada, Spain
| | - Joanne E Nettleship
- The Oxford Protein Production Facility, Research Complex at Harwell, Rutherford Appleton Laboratory, R92 Harwell, Didcot, Oxfordshire, OX11 0FA, UK
| | - Louise E Bird
- The Oxford Protein Production Facility, Research Complex at Harwell, Rutherford Appleton Laboratory, R92 Harwell, Didcot, Oxfordshire, OX11 0FA, UK
| | - Heather Rada
- The Oxford Protein Production Facility, Research Complex at Harwell, Rutherford Appleton Laboratory, R92 Harwell, Didcot, Oxfordshire, OX11 0FA, UK
| | - Keith S Wilson
- York Structural Biology Laboratory, Department of Chemistry, University of York, York, YO10 5DD, UK.
| | - Dolores González-Pacanowska
- Instituto de Parasitología y Biomedicina "López-Neyra", Consejo Superior de Investigaciones Científicas, Granada, Spain.
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15
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Baxter EW, Robinson JI, Tomlinson DC, Foster RJ, Owen RL, Win SJ, Nettleship JE, Tiede C, Kankanala J, Owens RJ, Fishwick CWG, McPherson MJ, Morgan AW. A7.08 Novel agents for blocking the interaction of immune complexes with the activatory FCγRIIIA receptor. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-209124.139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Ren J, Nettleship JE, Males A, Stuart DI, Owens RJ. Crystal structures of penicillin-binding protein 3 in complexes with azlocillin and cefoperazone in both acylated and deacylated forms. FEBS Lett 2016; 590:288-97. [PMID: 26823174 PMCID: PMC4764023 DOI: 10.1002/1873-3468.12054] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Revised: 12/18/2015] [Accepted: 01/01/2016] [Indexed: 11/10/2022]
Abstract
Penicillin‐binding protein 3 (PBP3) from Pseudomonas aeruginosa is the molecular target of β‐lactam‐based antibiotics. Structures of PBP3 in complexes with azlocillin and cefoperazone, which are in clinical use for the treatment of pseudomonad infections, have been determined to 2.0 Å resolution. Together with data from other complexes, these structures identify a common set of residues involved in the binding of β‐lactams to PBP3. Comparison of wild‐type and an active site mutant (S294A) showed that increased thermal stability of PBP3 following azlocillin binding was entirely due to covalent binding to S294, whereas cefoperazone binding produces some increase in stability without the covalent link. Consistent with this, a third crystal structure was determined in which the hydrolysis product of cefoperazone was noncovalently bound in the active site of PBP3. This is the first structure of a complex between a penicillin‐binding protein and cephalosporic acid and may be important in the design of new noncovalent PBP3 inhibitors.
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Affiliation(s)
- Jingshan Ren
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Oxford, UK
| | - Joanne E Nettleship
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Oxford, UK.,OPPF-UK, The Research Complex at Harwell, Rutherford Appleton Laboratory, Oxfordshire, UK
| | - Alexandra Males
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Oxford, UK.,OPPF-UK, The Research Complex at Harwell, Rutherford Appleton Laboratory, Oxfordshire, UK
| | - David I Stuart
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Oxford, UK.,Diamond Light Sources, Harwell Science and Innovation Campus, Didcot, UK
| | - Raymond J Owens
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Oxford, UK.,OPPF-UK, The Research Complex at Harwell, Rutherford Appleton Laboratory, Oxfordshire, UK
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Bird LE, Nettleship JE, Järvinen V, Rada H, Verma A, Owens RJ. Expression Screening of Integral Membrane Proteins by Fusion to Fluorescent Reporters. Advances in Experimental Medicine and Biology 2016; 922:1-11. [DOI: 10.1007/978-3-319-35072-1_1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Yassin A, Nettleship JE, Talib RA, Almehmadi Y, Doros G. Effects of testosterone replacement therapy withdrawal and re-treatment in hypogonadal elderly men upon obesity, voiding function and prostate safety parameters. Aging Male 2016; 19:64-9. [PMID: 26742589 DOI: 10.3109/13685538.2015.1126573] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Whether testosterone replacement therapy (TRT) is a lifelong treatment for men with hypogonadism remains unknown. We investigated long-term TRT and TRT withdrawal on obesity and prostate-related parameters. Two hundred and sixty-two hypogonadal patients (mean age 59.5) received testosterone undecanoate in 12-week intervals for a maximum of 11 years. One hundred and forty-seven men had TRT interrupted for a mean of 16.9 months and resumed thereafter (Group A). The remaining 115 patients were treated continuously (Group B). Prostate volume, prostate-specific antigen (PSA), residual voiding volume, bladder wall thickness, C-reactive protein (CRP), aging male symptoms (AMS), International Index of erectile function - erectile function (IIEF-EF) and International Prostate Symptoms Scores (IPSS) were measured over the study period with anthropometric parameters of obesity, including weight, body mass index (BMI) and waist circumference. Prior to interruption, TRT resulted in improvements in residual voiding volume, bladder wall thickness, CRP, AMS, IIEF-EF, IPSS and obesity parameters while PSA and prostate volume increased. TRT interruption reduced total testosterone to hypogonadal levels in Group A and resulted in worsening of obesity parameters, AMS, IPSS, residual voiding volume and bladder wall thickness, IIEF-EF and PSA while CRP and prostate volume were unchanged until treatment resumed whereby these effects were reversed. TRT interruption results in worsening of symptoms. Hypogonadism may require lifelong TRT.
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Affiliation(s)
- Aksam Yassin
- a Institute of Urology & Andrology , Norderstedt , Germany
- b Department of Preventive Medicine, Men's Health Programme , Dresden International University , Dresden , Germany
- c Department of Urology , School of Medicine, Gulf Medical University , Ajman , UAE
| | | | - Raidh A Talib
- e Department of Urology & Andrology , Hamad Medical Corporation , Doha , Qatar , and
| | | | - Gheorge Doros
- f Boston University School of Public Health , Boston , MA , USA
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Arena de Souza V, Scott DJ, Nettleship JE, Rahman N, Charlton MH, Walsh MA, Owens RJ. Comparison of the Structure and Activity of Glycosylated and Aglycosylated Human Carboxylesterase 1. PLoS One 2015; 10:e0143919. [PMID: 26657071 PMCID: PMC4676782 DOI: 10.1371/journal.pone.0143919] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 11/11/2015] [Indexed: 11/25/2022] Open
Abstract
Human Carboxylesterase 1 (hCES1) is the key liver microsomal enzyme responsible for detoxification and metabolism of a variety of clinical drugs. To analyse the role of the single N-linked glycan on the structure and activity of the enzyme, authentically glycosylated and aglycosylated hCES1, generated by mutating asparagine 79 to glutamine, were produced in human embryonic kidney cells. Purified enzymes were shown to be predominantly trimeric in solution by analytical ultracentrifugation. The purified aglycosylated enzyme was found to be more active than glycosylated hCES1 and analysis of enzyme kinetics revealed that both enzymes exhibit positive cooperativity. Crystal structures of hCES1 a catalytically inactive mutant (S221A) and the aglycosylated enzyme were determined in the absence of any ligand or substrate to high resolutions (1.86 Å, 1.48 Å and 2.01 Å, respectively). Superposition of all three structures showed only minor conformational differences with a root mean square deviations of around 0.5 Å over all Cα positions. Comparison of the active sites of these un-liganded enzymes with the structures of hCES1-ligand complexes showed that side-chains of the catalytic triad were pre-disposed for substrate binding. Overall the results indicate that preventing N-glycosylation of hCES1 does not significantly affect the structure or activity of the enzyme.
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Affiliation(s)
- Victoria Arena de Souza
- UK OPPF-UK, The Research Complex at Harwell, Rutherford Appleton Laboratory Harwell Oxford, Oxfordshire, United Kingdom
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Roosevelt Drive, Oxford, United Kingdom
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, United Kingdom
| | - David J. Scott
- The Research Complex at Harwell, Rutherford Appleton Laboratory Harwell Oxford, Oxfordshire, United Kingdom
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Sutton Bonington, Leicestershire, United Kingdom
| | - Joanne E. Nettleship
- UK OPPF-UK, The Research Complex at Harwell, Rutherford Appleton Laboratory Harwell Oxford, Oxfordshire, United Kingdom
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Roosevelt Drive, Oxford, United Kingdom
| | - Nahid Rahman
- UK OPPF-UK, The Research Complex at Harwell, Rutherford Appleton Laboratory Harwell Oxford, Oxfordshire, United Kingdom
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Roosevelt Drive, Oxford, United Kingdom
| | - Michael H. Charlton
- Chroma Therapeutics Ltd., 93 Innovation Drive Milton Park, Abingdon, United Kingdom
| | - Martin A. Walsh
- The Research Complex at Harwell, Rutherford Appleton Laboratory Harwell Oxford, Oxfordshire, United Kingdom
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, United Kingdom
- * E-mail: (MAW); (RJO)
| | - Raymond J. Owens
- UK OPPF-UK, The Research Complex at Harwell, Rutherford Appleton Laboratory Harwell Oxford, Oxfordshire, United Kingdom
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Roosevelt Drive, Oxford, United Kingdom
- * E-mail: (MAW); (RJO)
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Almehmadi Y, Yassin AA, Nettleship JE, Saad F. Testosterone replacement therapy improves the health-related quality of life of men diagnosed with late-onset hypogonadism. Arab J Urol 2015; 14:31-6. [PMID: 26966591 PMCID: PMC4767784 DOI: 10.1016/j.aju.2015.10.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Revised: 10/09/2015] [Accepted: 10/24/2015] [Indexed: 01/03/2023] Open
Abstract
Objectives To test the hypothesis that testosterone replacement therapy (TRT) improves the long-term health-related quality of life (HRQoL) of men with late-onset hypogonadism (LOH), as studies have shown that sub-physiological testosterone levels have a negative impact on psychological (e.g. mood, vitality, libido and sexual interest) and physical features (e.g. erectile function and physical strength), all of which contribute to a sense of well-being. Patients and methods In all, 261 patients (mean age 58 years) diagnosed with LOH were treated with long-acting intramuscular testosterone undecanoate (TU) for up to 5 years. Health quality indicators including the International Prostate Symptom Score (IPSS), the five-item version of the International Index of Erectile Function (IIEF-5), the Aging Males’ Symptoms (AMS) scale, and the percentage of patients reporting joint and muscle pain were measured at baseline and at each visit. The means were then plotted over time in parallel with mean total testosterone (TT) levels. Results Both the mean IPSS and AMS scores fell significantly within the first 3 months and the mean IIEF-5 score and TT levels increased within the first 3 months. All four parameters continued to improve over the course of the trial. The percentage of patients reporting both joint and muscle pain decreased during TRT. Conclusions This prospective, observational and longitudinal analysis shows a clear improvement in both psychological and physical characteristics as physiological testosterone levels are reached and maintained contributing to an improvement in the HRQoL in men with diagnosed LOH.
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Affiliation(s)
| | - Aksam A Yassin
- Institute of Urology/Andrology, Norderstedt-Hamburg, Germany; Dresden International University, Dresden, Germany; Gulf Medical University School of Medicine, Ajman, United Arab Emirates
| | - Joanne E Nettleship
- Department of Human Metabolism, University of Sheffield, Sheffield, South Yorkshire, UK
| | - Farid Saad
- Gulf Medical University School of Medicine, Ajman, United Arab Emirates; Global Medical Affairs Men's Healthcare, Bayer Pharma AG, Berlin, Germany
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21
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Yassin AA, Nettleship JE, Almehmadi Y, Yassin DJ, El Douaihy Y, Saad F. Is there a relationship between the severity of erectile dysfunction and the comorbidity profile in men with late onset hypogonadism? Arab J Urol 2015; 13:162-8. [PMID: 26413340 PMCID: PMC4563011 DOI: 10.1016/j.aju.2015.06.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2015] [Revised: 06/05/2015] [Accepted: 06/08/2015] [Indexed: 12/22/2022] Open
Abstract
Objective To determine whether the severity of erectile dysfunction (ED) in a man diagnosed with late-onset hypogonadism (LOH) gives information about his metabolic syndrome state, as patients with LOH often have sexual symptoms and associated cardiovascular and metabolic comorbidities, but the role of ED in predicting the prevalence of comorbid disease in men with low levels of testosterone is currently unknown. Patients and methods Men (130) diagnosed with LOH and fulfilling the criteria of a total testosterone level of <3.5 ng/mL (<12 nmol/L), and with an erectile function domain score of <21 on the International Index of Erectile Function questionnaire (IIEF, questions 1–5), were enrolled for a subsequent trial of supplementation with testosterone undecanoate. Demographic data were recorded at baseline. The men completed three standardised questionnaires to assess sexual health, including the International Prostate Symptom Score, Ageing Males Symptoms (AMS) and IIEF Sexual Health Inventory for Men (SHIM). Patients were stratified by the severity of ED, with SHIM scores of 1–7 considered severe, 8–11 moderate, and 12–16 mild to moderate. Levels of serum testosterone, sex hormone binding globulin (SHBG) and lipids (total cholesterol, triglycerides, high-density and low-density lipoprotein) were assessed, along with plasma fasting glucose and glycated haemoglobin (HbA1c) levels. Body weight, body mass index and waist circumference were also recorded. Results There was a significant association between the severity of ED and mean weight (P < 0.001), waist circumference (P < 0.001), triglycerides (P = 0.009), total cholesterol (P = 0.027), HbA1c (P < 0.001), fasting glucose (P = 0.003) and AMS scores (P = 0.043). There were no significant differences in testosterone fractions and SHBG levels between the ED subgroups. There was a positive correlation between the prevalence of diabetes mellitus (type 1 and type 2) and the severity of ED in these men (P = 0.018). Conclusions The descriptive data showed that a greater severity of ED in men with LOH correlated with an increased waist circumference, hyperglycaemia, hypertriglyceridaemia, hyperlipidaemia, and a history of diabetes mellitus. Severe ED is a prognostic indicator of comorbidities in men with LOH.
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Key Words
- AMS, Ageing Males Symptoms
- BMI, body mass index
- CVD, cardiovascular disease
- Comorbidities
- DM(1,2), diabetes mellitus (type 1, type 2)
- ED, erectile dysfunction
- Erectile dysfunction
- HDL, high-density lipoprotein
- HbA1c, glycated haemoglobin
- Hypogonadism
- IIEF, International Index of Erectile Function
- LDL, low-density lipoprotein
- LOH, late-onset hypogonadism
- MetS, metabolic syndrome
- Prediction
- S, M, MM, severe, moderate, mild to moderate
- SHBG, sex hormone-binding globulin
- SHIM, Sexual Health Inventory for Men
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Affiliation(s)
- Aksam A Yassin
- Institute of Urology/Andrology, Norderstedt-Hamburg, Germany ; Dresden International University, Dresden, Germany ; Gulf Medical University School of Medicine, Ajman, United Arab Emirates
| | | | | | - Dany-Jan Yassin
- Klinikum Braunschweig, Department of Urology, Braunschweig, Germany
| | | | - Farid Saad
- Gulf Medical University School of Medicine, Ajman, United Arab Emirates ; Global Medical Affairs Men's Healthcare, Bayer Pharma AG, Berlin, Germany
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22
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Nettleship JE, Watson PJ, Rahman-Huq N, Fairall L, Posner MG, Upadhyay A, Reddivari Y, Chamberlain JMG, Kolstoe SE, Bagby S, Schwabe JWR, Owens RJ. Transient expression in HEK 293 cells: an alternative to E. coli for the production of secreted and intracellular mammalian proteins. Methods Mol Biol 2015; 1258:209-22. [PMID: 25447866 DOI: 10.1007/978-1-4939-2205-5_11] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Transient transfection of human embryonic kidney cells (HEK 293) enables the rapid and affordable lab-scale production of recombinant proteins. In this chapter protocols for the expression and purification of both secreted and intracellular proteins using transient expression in HEK 293 cells are described.
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Affiliation(s)
- Joanne E Nettleship
- OPPF-UK, Research Complex at Harwell, R92 Rutherford Appleton Laboratories, Harwell Oxford, Didcot, OX11 0FA, UK,
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23
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Hu NJ, Rada H, Rahman N, Nettleship JE, Bird L, Iwata S, Drew D, Cameron AD, Owens RJ. GFP-based expression screening of membrane proteins in insect cells using the baculovirus system. Methods Mol Biol 2015; 1261:197-209. [PMID: 25502201 DOI: 10.1007/978-1-4939-2230-7_11] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A key step in the production of recombinant membrane proteins for structural studies is the optimization of protein yield and quality. One commonly used approach is to fuse the protein to green fluorescent protein (GFP), enabling expression to be tracked without the need to purify the protein. Combining fusion to green fluorescent protein with the baculovirus expression system provides a useful platform for both screening and production of eukaryotic membrane proteins. In this chapter we describe our protocol for the expression screening of membrane proteins in insect cells using fusion to GFP as a reporter. We use both SDS-PAGE with in-gel fluorescence imaging and fluorescence-detection size-exclusion chromatography (FSEC) to screen for expression.
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Affiliation(s)
- Nien-Jen Hu
- Institute of Biochemistry, National Chung Hsing University, Taichung, 40227, Taiwan,
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24
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Kelly DM, Nettleship JE, Akhtar S, Muraleedharan V, Sellers DJ, Brooke JC, McLaren DS, Channer KS, Jones TH. Testosterone suppresses the expression of regulatory enzymes of fatty acid synthesis and protects against hepatic steatosis in cholesterol-fed androgen deficient mice. Life Sci 2014; 109:95-103. [PMID: 24953607 DOI: 10.1016/j.lfs.2014.06.007] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Revised: 05/30/2014] [Accepted: 06/07/2014] [Indexed: 02/07/2023]
Abstract
AIMS Non-alcoholic fatty liver disease and its precursor hepatic steatosis is common in obesity and type-2 diabetes and is associated with cardiovascular disease (CVD). Men with type-2 diabetes and/or CVD have a high prevalence of testosterone deficiency. Testosterone replacement improves key cardiovascular risk factors. The effects of testosterone on hepatic steatosis are not fully understood. MAIN METHODS Testicular feminised (Tfm) mice, which have a non-functional androgen receptor (AR) and very low serum testosterone levels, were used to investigate testosterone effects on high-cholesterol diet-induced hepatic steatosis. KEY FINDINGS Hepatic lipid deposition was increased in Tfm mice and orchidectomised wild-type littermates versus intact wild-type littermate controls with normal androgen physiology. Lipid deposition was reduced in Tfm mice receiving testosterone treatment compared to placebo. Oestrogen receptor blockade significantly, but only partially, reduced the beneficial effects of testosterone treatment on hepatic lipid accumulation. Expression of key regulatory enzymes of fatty acid synthesis, acetyl-CoA carboxylase alpha (ACACA) and fatty acid synthase (FASN) were elevated in placebo-treated Tfm mice versus placebo-treated littermates and Tfm mice receiving testosterone treatment. Tfm mice on normal diet had increased lipid accumulation compared to littermates but significantly less than cholesterol-fed Tfm mice and demonstrated increased gene expression of hormone sensitive lipase, stearyl-CoA desaturase-1 and peroxisome proliferator-activated receptor-gamma but FASN and ACACA were not altered. SIGNIFICANCE An action of testosterone on hepatic lipid deposition which is independent of the classic AR is implicated. Testosterone may act in part via an effect on the key regulatory lipogenic enzymes to protect against hepatic steatosis.
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Affiliation(s)
- Daniel M Kelly
- Department of Human Metabolism, Medical School, Universiy of Sheffield, Sheffield, UK.
| | - Joanne E Nettleship
- Department of Human Metabolism, Medical School, Universiy of Sheffield, Sheffield, UK
| | - Samia Akhtar
- Department of Human Metabolism, Medical School, Universiy of Sheffield, Sheffield, UK
| | - Vakkat Muraleedharan
- Department of Human Metabolism, Medical School, Universiy of Sheffield, Sheffield, UK; Centre for Diabetes and Endocrinology, Barnsley Hospital NHS Foundation Trust, Barnsley, UK
| | - Donna J Sellers
- Biomedical Research Centre, Sheffield Hallam University, Sheffield S1 1WB, UK
| | - Jonathan C Brooke
- Department of Human Metabolism, Medical School, Universiy of Sheffield, Sheffield, UK
| | - David S McLaren
- Department of Human Metabolism, Medical School, Universiy of Sheffield, Sheffield, UK
| | - Kevin S Channer
- Biomedical Research Centre, Sheffield Hallam University, Sheffield S1 1WB, UK; Department of Cardiology, Royal Hallamshire Hospital, Sheffield, UK
| | - T Hugh Jones
- Department of Human Metabolism, Medical School, Universiy of Sheffield, Sheffield, UK; Centre for Diabetes and Endocrinology, Barnsley Hospital NHS Foundation Trust, Barnsley, UK
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25
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Tiede C, Tang AAS, Deacon SE, Mandal U, Nettleship JE, Owen RL, George SE, Harrison DJ, Owens RJ, Tomlinson DC, McPherson MJ. Adhiron: a stable and versatile peptide display scaffold for molecular recognition applications. Protein Eng Des Sel 2014; 27:145-55. [PMID: 24668773 PMCID: PMC4000234 DOI: 10.1093/protein/gzu007] [Citation(s) in RCA: 109] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
We have designed a novel non-antibody scaffold protein, termed Adhiron, based on a phytocystatin consensus sequence. The Adhiron scaffold shows high thermal stability (Tm ca. 101°C), and is expressed well in Escherichia coli. We have determined the X-ray crystal structure of the Adhiron scaffold to 1.75 Å resolution revealing a compact cystatin-like fold. We have constructed a phage-display library in this scaffold by insertion of two variable peptide regions. The library is of high quality and complexity comprising 1.3 × 1010 clones. To demonstrate library efficacy, we screened against the yeast Small Ubiquitin-like Modifier (SUMO). In selected clones, variable region 1 often contained sequences homologous to the known SUMO interactive motif (V/I-X-V/I-V/I). Four Adhirons were further characterised and displayed low nanomolar affinities and high specificity for yeast SUMO with essentially no cross-reactivity to human SUMO protein isoforms. We have identified binders against >100 target molecules to date including as examples, a fibroblast growth factor (FGF1), platelet endothelial cell adhesion molecule (PECAM-1; CD31), the SH2 domain Grb2 and a 12-aa peptide. Adhirons are highly stable and well expressed allowing highly specific binding reagents to be selected for use in molecular recognition applications.
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Affiliation(s)
- Christian Tiede
- Biomedical Health Research Centre, BioScreening Technology Group, University of Leeds, Leeds LS2 9JT, UK
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26
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van Berkel SS, Nettleship JE, Leung IKH, Brem J, Choi H, Stuart DI, Claridge TDW, McDonough MA, Owens RJ, Ren J, Schofield CJ. Binding of (5S)-penicilloic acid to penicillin binding protein 3. ACS Chem Biol 2013; 8:2112-6. [PMID: 23899657 DOI: 10.1021/cb400200h] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
β-Lactam antibiotics react with penicillin binding proteins (PBPs) to form relatively stable acyl-enzyme complexes. We describe structures derived from the reaction of piperacillin with PBP3 (Pseudomonas aeruginosa) including not only the anticipated acyl-enzyme complex but also an unprecedented complex with (5S)-penicilloic acid, which was formed by C-5 epimerization of the nascent (5R)-penicilloic acid product. Formation of the complex was confirmed by solution studies, including NMR. Together, these results will be useful in the design of new PBP inhibitors and raise the possibility that noncovalent PBP inhibition by penicilloic acids may be of clinical relevance.
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Affiliation(s)
- Sander S. van Berkel
- Chemistry
Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1
3TA, U.K
| | - Joanne E. Nettleship
- Oxford Protein
Production Facility
U.K., Research Complex at Harwell, Rutherford Appleton Laboratory Harwell, Science and Innovation Campus, Oxfordshire
OX11 0FA, U.K
- Division of
Structural Biology, University of Oxford, Henry Wellcome Building for Genomic
Medicine, Oxford OX3 7BN, U.K
| | - Ivanhoe K. H. Leung
- Chemistry
Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1
3TA, U.K
| | - Jürgen Brem
- Chemistry
Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1
3TA, U.K
| | - Hwanho Choi
- Chemistry
Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1
3TA, U.K
| | - David I. Stuart
- Division of
Structural Biology, University of Oxford, Henry Wellcome Building for Genomic
Medicine, Oxford OX3 7BN, U.K
| | - Timothy D. W. Claridge
- Chemistry
Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1
3TA, U.K
| | - Michael A. McDonough
- Chemistry
Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1
3TA, U.K
| | - Raymond J. Owens
- Oxford Protein
Production Facility
U.K., Research Complex at Harwell, Rutherford Appleton Laboratory Harwell, Science and Innovation Campus, Oxfordshire
OX11 0FA, U.K
- Division of
Structural Biology, University of Oxford, Henry Wellcome Building for Genomic
Medicine, Oxford OX3 7BN, U.K
| | - Jingshan Ren
- Division of
Structural Biology, University of Oxford, Henry Wellcome Building for Genomic
Medicine, Oxford OX3 7BN, U.K
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27
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Knox R, Nettleship JE, Chang VT, Hui ZK, Santos AM, Rahman N, Ho LP, Owens RJ, Davis SJ. A streamlined implementation of the glutamine synthetase-based protein expression system. BMC Biotechnol 2013; 13:74. [PMID: 24063773 PMCID: PMC3850363 DOI: 10.1186/1472-6750-13-74] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Accepted: 09/10/2013] [Indexed: 11/10/2022] Open
Abstract
Background The glutamine synthetase-based protein expression system is widely used in industry and academia for producing recombinant proteins but relies on the cloning of transfected cells, necessitating substantial investments in time and handling. We streamlined the production of protein-producing cultures of Chinese hamster ovary cells using this system by co-expressing green fluorescent protein from an internal ribosomal entry site and selecting for high green fluorescent protein-expressing cells using fluorescence-activated cell sorting. Results Whereas other expression systems utilizing green fluorescent protein and fluorescence-activated cell sorting-based selection have relied on two or more sorting steps, we obtained stable expression of a test protein at levels >50% of that of an “average” clone and ~40% that of the “best” clone following a single sorting step. Versus clone-based selection, the principal savings are in the number of handling steps (reduced by a third), handling time (reduced by 70%), and the time needed to produce protein-expressing cultures (reduced by ~3 weeks). Coupling the glutamine synthetase-based expression system with product-independent selection in this way also facilitated the production of a hard-to-assay protein. Conclusion Utilizing just a single fluorescence-activated cell sorting-based selection step, the new streamlined implementation of the glutamine synthetase-based protein expression system offers protein yields sufficient for most research purposes, where <10 mg/L of protein expression is often required but relatively large numbers of constructs frequently need to be trialed.
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Affiliation(s)
- Rachel Knox
- Radcliffe Department of Medicine and MRC Human Immunology Unit, John Radcliffe Hospital, University of Oxford, Headington, OX3 9DS Oxford, UK.
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Nettleship JE, Ren J, Scott DJ, Rahman N, Hatherley D, Zhao Y, Stuart DI, Barclay AN, Owens RJ. Crystal structure of signal regulatory protein gamma (SIRPγ) in complex with an antibody Fab fragment. BMC Struct Biol 2013; 13:13. [PMID: 23826770 PMCID: PMC3716694 DOI: 10.1186/1472-6807-13-13] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2012] [Accepted: 06/24/2013] [Indexed: 11/28/2022]
Abstract
BACKGROUND Signal Regulatory Protein γ (SIRPγ) is a member of a closely related family of three cell surface receptors implicated in modulating immune/inflammatory responses. SIRPγ is expressed on T lymphocytes where it appears to be involved in the integrin-independent adhesion of lymphocytes to antigen-presenting cells. Here we describe the first full length structure of the extracellular region of human SIRPγ. RESULTS We obtained crystals of SIRPγ by making a complex of the protein with the Fab fragment of the anti-SIRP antibody, OX117, which also binds to SIRPα and SIRPβ. We show that the epitope for FabOX117 is formed at the interface of the first and second domains of SIRPγ and comprises residues which are conserved between all three SIRPs. The FabOX117 binding site is distinct from the region in domain 1 which interacts with CD47, the physiological ligand for both SIRPγ and SIRPα but not SIRPβ. Comparison of the three domain structures of SIRPγ and SIRPα showed that these receptors can adopt different overall conformations due to the flexibility of the linker between the first two domains. SIRPγ in complex with FabOX117 forms a dimer in the crystal. Binding to the Fab fixes the position of domain 1 relative to domains 2/3 exposing a surface which favours formation of a homotypic dimer. However, the interaction appears to be relatively weak since only monomers of SIRPγ were observed in sedimentation velocity analytical ultracentrifugation of the protein alone. Studies of complex formation by equilibrium ultracentrifugation showed that only a 1:1 complex of SIRPγ: FabOX117 was formed with a dissociation constant in the low micromolar range (Kd = 1.2 +/- 0.3 μM). CONCLUSION The three-domain extracellular regions of SIRPs are structurally conserved but show conformational flexibility in the disposition of the amino terminal ligand-binding Ig domain relative to the two membrane proximal Ig domains. Binding of a cross-reactive anti-SIRP Fab fragment to SIRPγ stabilises a conformation that favours SIRP dimer formation in the crystal structure, though this interaction does not appear sufficiently stable to be observed in solution.
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MESH Headings
- Antigen-Antibody Complex/chemistry
- Antigen-Antibody Complex/metabolism
- Antigens, Differentiation/chemistry
- Antigens, Differentiation/genetics
- Antigens, Differentiation/metabolism
- Binding Sites
- Crystallography, X-Ray
- Dimerization
- HEK293 Cells
- Humans
- Immunoglobulin Fab Fragments/chemistry
- Immunoglobulin Fab Fragments/genetics
- Immunoglobulin Fab Fragments/immunology
- Immunoglobulin Fab Fragments/metabolism
- Protein Structure, Tertiary
- Receptors, Cell Surface/chemistry
- Receptors, Cell Surface/genetics
- Receptors, Cell Surface/metabolism
- Receptors, Immunologic/chemistry
- Receptors, Immunologic/genetics
- Receptors, Immunologic/metabolism
- Recombinant Proteins/biosynthesis
- Recombinant Proteins/chemistry
- Recombinant Proteins/genetics
- Ultracentrifugation
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Affiliation(s)
- Joanne E Nettleship
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, UK
- OPPF-UK, The Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Oxford, Oxfordshire OX11 0FA, UK
| | - Jingshan Ren
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, UK
| | - David J Scott
- The Research Complex at Harwell and ISIS Neutron and Muon source, Rutherford Appleton Laboratory, Harwell Oxford, Oxfordshire OX11 0FA, UK
- The School of Biosciences, University of Nottingham, Sutton Bonington Campus, Sutton Bonington, Leicestershire LE12 5RD, UK
| | - Nahid Rahman
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, UK
- OPPF-UK, The Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Oxford, Oxfordshire OX11 0FA, UK
| | - Deborah Hatherley
- Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK
| | - Yuguang Zhao
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, UK
| | - David I Stuart
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, UK
- Diamond Light Sources, Harwell Science and Innovation Campus, Didcot OX11 0DE, UK
| | - A Neil Barclay
- Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK
| | - Raymond J Owens
- Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, UK
- OPPF-UK, The Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Oxford, Oxfordshire OX11 0FA, UK
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Byrne RT, Whelan F, Aller P, Bird LE, Dowle A, Lobley CMC, Reddivari Y, Nettleship JE, Owens RJ, Antson AA, Waterman DG. S-Adenosyl-S-carboxymethyl-L-homocysteine: a novel cofactor found in the putative tRNA-modifying enzyme CmoA. Acta Crystallogr D Biol Crystallogr 2013; 69:1090-8. [PMID: 23695253 PMCID: PMC3663124 DOI: 10.1107/s0907444913004939] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2013] [Accepted: 02/20/2013] [Indexed: 02/02/2023]
Abstract
The putative methyltransferase CmoA is involved in the nucleoside modification of transfer RNA. X-ray crystallography and mass spectrometry are used to show that it contains a novel SAM derivative, S-adenosyl-S-carboxymethyl-l-homocysteine, in which the donor methyl group is replaced by a carboxymethyl group. Uridine at position 34 of bacterial transfer RNAs is commonly modified to uridine-5-oxyacetic acid (cmo5U) to increase the decoding capacity. The protein CmoA is involved in the formation of cmo5U and was annotated as an S-adenosyl-l-methionine-dependent (SAM-dependent) methyltransferase on the basis of its sequence homology to other SAM-containing enzymes. However, both the crystal structure of Escherichia coli CmoA at 1.73 Å resolution and mass spectrometry demonstrate that it contains a novel cofactor, S-adenosyl-S-carboxymethyl-l-homocysteine (SCM-SAH), in which the donor methyl group is substituted by a carboxymethyl group. The carboxyl moiety forms a salt-bridge interaction with Arg199 that is conserved in a large group of CmoA-related proteins but is not conserved in other SAM-containing enzymes. This raises the possibility that a number of enzymes that have previously been annotated as SAM-dependent are in fact SCM-SAH-dependent. Indeed, inspection of electron density for one such enzyme with known X-ray structure, PDB entry 1im8, suggests that the active site contains SCM-SAH and not SAM.
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Affiliation(s)
- Robert T Byrne
- York Structural Biology Laboratory, Department of Chemistry, University of York, Heslington YO10 5DD, England
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30
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Lobley CMC, Aller P, Douangamath A, Reddivari Y, Bumann M, Bird LE, Nettleship JE, Brandao-Neto J, Owens RJ, O’Toole PW, Walsh MA. Structure of ribose 5-phosphate isomerase from the probiotic bacterium Lactobacillus salivarius UCC118. Acta Crystallogr Sect F Struct Biol Cryst Commun 2012; 68:1427-33. [PMID: 23192019 PMCID: PMC3509960 DOI: 10.1107/s174430911204273x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Accepted: 10/12/2012] [Indexed: 11/10/2022]
Abstract
The structure of ribose 5-phosphate isomerase from the probiotic bacterium Lactobacillus salivarius UCC188 has been determined at 1.72 Å resolution. The structure was solved by molecular replacement, which identified the functional homodimer in the asymmetric unit. Despite only showing 57% sequence identity to its closest homologue, the structure adopted the typical α and β D-ribose 5-phosphate isomerase fold. Comparison to other related structures revealed high homology in the active site, allowing a model of the substrate-bound protein to be proposed. The determination of the structure was expedited by the use of in situ crystallization-plate screening on beamline I04-1 at Diamond Light Source to identify well diffracting protein crystals prior to routine cryocrystallography.
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Affiliation(s)
- Carina M. C. Lobley
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, England
| | - Pierre Aller
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, England
| | - Alice Douangamath
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, England
| | - Yamini Reddivari
- Oxford Protein Production Facility UK, Research Complex at Harwell, R92 Rutherford Appleton Laboratories, Harwell, Oxfordshire OX11 0FA, England
| | - Mario Bumann
- MRC France, BM14, c/o ESRF, 6 Rue Jules Horowitz, BP 220, 38043 Grenoble France
| | - Louise E. Bird
- Oxford Protein Production Facility UK, Research Complex at Harwell, R92 Rutherford Appleton Laboratories, Harwell, Oxfordshire OX11 0FA, England
| | - Joanne E. Nettleship
- Oxford Protein Production Facility UK, Research Complex at Harwell, R92 Rutherford Appleton Laboratories, Harwell, Oxfordshire OX11 0FA, England
| | - Jose Brandao-Neto
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, England
| | - Raymond J. Owens
- Oxford Protein Production Facility UK, Research Complex at Harwell, R92 Rutherford Appleton Laboratories, Harwell, Oxfordshire OX11 0FA, England
| | - Paul W. O’Toole
- Department of Microbiology, Alimentary Pharmabiotic Centre, University College Cork, Cork, Ireland
| | - Martin A. Walsh
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, England
- MRC France, BM14, c/o ESRF, 6 Rue Jules Horowitz, BP 220, 38043 Grenoble France
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31
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Owen RL, Axford D, Nettleship JE, Owens RJ, Robinson JI, Morgan AW, Doré AS, Lebon G, Tate CG, Fry EE, Ren J, Stuart DI, Evans G. Outrunning free radicals in room-temperature macromolecular crystallography. Acta Crystallogr D Biol Crystallogr 2012; 68:810-8. [PMID: 22751666 PMCID: PMC4791751 DOI: 10.1107/s0907444912012553] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2012] [Accepted: 03/22/2012] [Indexed: 11/13/2022]
Abstract
A significant increase in the lifetime of room-temperature macromolecular crystals is reported through the use of a high-brilliance X-ray beam, reduced exposure times and a fast-readout detector. This is attributed to the ability to collect diffraction data before hydroxyl radicals can propagate through the crystal, fatally disrupting the lattice. Hydroxyl radicals are shown to be trapped in amorphous solutions at 100 K. The trend in crystal lifetime was observed in crystals of a soluble protein (immunoglobulin γ Fc receptor IIIa), a virus (bovine enterovirus serotype 2) and a membrane protein (human A(2A) adenosine G-protein coupled receptor). The observation of a similar effect in all three systems provides clear evidence for a common optimal strategy for room-temperature data collection and will inform the design of future synchrotron beamlines and detectors for macromolecular crystallography.
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Affiliation(s)
- Robin L Owen
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, England.
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32
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Axford D, Owen RL, Aishima J, Foadi J, Morgan AW, Robinson JI, Nettleship JE, Owens RJ, Moraes I, Fry EE, Grimes JM, Harlos K, Kotecha A, Ren J, Sutton G, Walter TS, Stuart DI, Evans G. In situ macromolecular crystallography using microbeams. Acta Crystallogr D Biol Crystallogr 2012; 68:592-600. [PMID: 22525757 PMCID: PMC4791750 DOI: 10.1107/s0907444912006749] [Citation(s) in RCA: 111] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Accepted: 02/14/2012] [Indexed: 12/04/2022]
Abstract
Despite significant progress in high-throughput methods in macromolecular crystallography, the production of diffraction-quality crystals remains a major bottleneck. By recording diffraction in situ from crystals in their crystallization plates at room temperature, a number of problems associated with crystal handling and cryoprotection can be side-stepped. Using a dedicated goniometer installed on the microfocus macromolecular crystallography beamline I24 at Diamond Light Source, crystals have been studied in situ with an intense and flexible microfocus beam, allowing weakly diffracting samples to be assessed without a manual crystal-handling step but with good signal to noise, despite the background scatter from the plate. A number of case studies are reported: the structure solution of bovine enterovirus 2, crystallization screening of membrane proteins and complexes, and structure solution from crystallization hits produced via a high-throughput pipeline. These demonstrate the potential for in situ data collection and structure solution with microbeams.
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Affiliation(s)
- Danny Axford
- Life Science Division, Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, England
| | - Robin L. Owen
- Life Science Division, Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, England
| | - Jun Aishima
- Life Science Division, Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, England
| | - James Foadi
- Life Science Division, Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, England
- Membrane Protein Laboratory, Imperial College, London SW7 2AZ, England
| | - Ann W. Morgan
- NIHR–Leeds Musculoskeletal Biomedical Research Unit and Leeds Institute of Molecular Medicine, University of Leeds, Leeds LS9 7FT, England
| | - James I. Robinson
- NIHR–Leeds Musculoskeletal Biomedical Research Unit and Leeds Institute of Molecular Medicine, University of Leeds, Leeds LS9 7FT, England
| | - Joanne E. Nettleship
- OPPF-UK, Research Complex at Harwell, Rutherford Appleton Laboratory R92, Didcot, Oxfordshire OX11 0DE, England
| | - Raymond J. Owens
- OPPF-UK, Research Complex at Harwell, Rutherford Appleton Laboratory R92, Didcot, Oxfordshire OX11 0DE, England
| | - Isabel Moraes
- Membrane Protein Laboratory, Imperial College, London SW7 2AZ, England
| | - Elizabeth E. Fry
- Division of Structural Biology, Wellcome Trust Centre of Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, England
| | - Jonathan M. Grimes
- Division of Structural Biology, Wellcome Trust Centre of Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, England
| | - Karl Harlos
- Division of Structural Biology, Wellcome Trust Centre of Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, England
| | - Abhay Kotecha
- Division of Structural Biology, Wellcome Trust Centre of Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, England
| | - Jingshan Ren
- Division of Structural Biology, Wellcome Trust Centre of Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, England
| | - Geoff Sutton
- Division of Structural Biology, Wellcome Trust Centre of Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, England
| | - Thomas S. Walter
- Division of Structural Biology, Wellcome Trust Centre of Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, England
| | - David I. Stuart
- Life Science Division, Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, England
- Division of Structural Biology, Wellcome Trust Centre of Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, England
| | - Gwyndaf Evans
- Life Science Division, Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, England
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33
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Nettleship JE. ChemInform Abstract: Hydrophilic Interaction Liquid Chromatography in the Characterization of Glycoproteins. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/chin.201137278] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Holdom MD, Davies AM, Nettleship JE, Bagby SC, Dhaliwal B, Girardi E, Hunt J, Gould HJ, Beavil AJ, McDonnell JM, Owens RJ, Sutton BJ. Conformational changes in IgE contribute to its uniquely slow dissociation rate from receptor FcɛRI. Nat Struct Mol Biol 2011; 18:571-6. [PMID: 21516097 PMCID: PMC3357048 DOI: 10.1038/nsmb.2044] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2011] [Accepted: 02/11/2011] [Indexed: 11/09/2022]
Abstract
Among antibody classes, IgE has a uniquely slow dissociation rate from, and high affinity for, its cell surface receptor FcɛRI. We show the structural basis for these key determinants of the ability of IgE to mediate allergic hypersensitivity through the 3.4-Å-resolution crystal structure of human IgE-Fc (consisting of the Cɛ2, Cɛ3 and Cɛ4 domains) bound to the extracellular domains of the FcɛRI α chain. Comparison with the structure of free IgE-Fc (reported here at a resolution of 1.9 Å) shows that the antibody, which has a compact, bent structure before receptor engagement, becomes even more acutely bent in the complex. Thermodynamic analysis indicates that the interaction is entropically driven, which explains how the noncontacting Cɛ2 domains, in place of the flexible hinge region of IgG antibodies, contribute together with the conformational changes to the unique binding properties of IgE.
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Affiliation(s)
- Mary D Holdom
- King's College London, Randall Division of Cell and Molecular Biophysics, London, UK
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35
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Ren J, Sainsbury S, Nettleship JE, Saunders NJ, Owens RJ. The crystal structure of NGO0477 from Neisseria gonorrhoeae reveals a novel protein fold incorporating a helix-turn-helix motif. Proteins 2010; 78:1798-802. [PMID: 20196080 DOI: 10.1002/prot.22698] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jingshan Ren
- The Oxford Protein Production Facility and Division of Structural Biology, University of Oxford, Oxford OX3 7BN, United Kingdom
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Bird LE, Ren J, Nettleship JE, Folkers GE, Owens RJ, Stammers DK. Novel structural features in two ZHX homeodomains derived from a systematic study of single and multiple domains. BMC Struct Biol 2010; 10:13. [PMID: 20509910 PMCID: PMC2893186 DOI: 10.1186/1472-6807-10-13] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2010] [Accepted: 05/28/2010] [Indexed: 11/10/2022]
Abstract
BACKGROUND Zhx1 to 3 (zinc-fingers and homeoboxes) form a set of paralogous genes encoding multi-domain proteins. ZHX proteins consist of two zinc fingers followed by five homeodomains. ZHXs have biological roles in cell cycle control by acting as co-repressors of the transcriptional regulator Nuclear Factor Y. As part of a structural genomics project we have expressed single and multi-domain fragments of the different human ZHX genes for use in structure determination. RESULTS A total of 30 single and multiple domain ZHX1-3 constructs selected from bioinformatics protocols were screened for soluble expression in E. coli using high throughput methodologies. Two homeodomains were crystallized leading to structures for ZHX1 HD4 and ZHX2 HD2. ZHX1 HD4, although closest matched to homeodomains from 'homez' and 'engrailed', showed structural differences, notably an additional C-terminal helix (helix V) which wrapped over helix I thereby making extensive contacts. Although ZHX2 HD2-3 was successfully expressed and purified, proteolysis occurred during crystallization yielding crystals of just HD2. The structure of ZHX2 HD2 showed an unusual open conformation with helix I undergoing 'domain-swapping' to form a homodimer. CONCLUSIONS Although multiple-domain constructs of ZHX1 selected by bioinformatics studies could be expressed solubly, only single homeodomains yielded crystals. The crystal structure of ZHX1 HD4 showed additional hydrophobic interactions relative to many known homeodomains via extensive contacts formed by the novel C-terminal helix V with, in particular, helix I. Additionally, the replacement of some charged covariant residues (which are commonly observed to form salt bridges in non-homeotherms such as the Drosophila 'engrailed' homeodomain), by apolar residues further increases hydrophobic contacts within ZHX1 HD4, and potentially stability, relative to engrailed homeodomain. ZHX1 HD4 helix V points away from the normally observed DNA major groove binding site on homeodomains and thus would not obstruct the putative binding of nucleic acid. In contrast, for ZHX2 HD2 the observed altered conformation involving rearrangement of helix I, relative to the canonical homeodomain fold, disrupts the normal DNA binding site, although protein-protein binding is possible as observed in homodimer formation.
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Sainsbury S, Ren J, Nettleship JE, Saunders NJ, Stuart DI, Owens RJ. The structure of a reduced form of OxyR from Neisseria meningitidis. BMC Struct Biol 2010; 10:10. [PMID: 20478059 PMCID: PMC2881104 DOI: 10.1186/1472-6807-10-10] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2009] [Accepted: 05/17/2010] [Indexed: 01/01/2023]
Abstract
BACKGROUND Survival of the human pathogen, Neisseria meningitidis, requires an effective response to oxidative stress resulting from the release of hydrogen peroxide by cells of the human immune system. In N. meningitidis, expression of catalase, which is responsible for detoxifying hydrogen peroxide, is controlled by OxyR, a redox responsive LysR-type regulator. OxyR responds directly to intracellular hydrogen peroxide through the reversible formation of a disulphide bond between C199 and C208 in the regulatory domain of the protein. RESULTS We report the first crystal structure of the regulatory domain of an OxyR protein (NMB0173 from N. meningitidis) in the reduced state i.e. with cysteines at positions 199 and 208. The protein was crystallized under reducing conditions and the structure determined to a resolution of 2.4 A. The overall fold of the Neisseria OxyR shows a high degree of similarity to the structure of a C199S mutant OxyR from E. coli, which cannot form the redox sensitive disulphide. In the neisserial structure, C199 is located at the start of helix alpha3, separated by 18 A from C208, which is positioned between helices alpha3 and alpha4. In common with other LysR-type regulators, full length OxyR proteins are known to assemble into tetramers. Modelling of the full length neisserial OxyR as a tetramer indicated that C199 and C208 are located close to the dimer-dimer interface in the assembled tetramer. The formation of the C199-C208 disulphide may thus affect the quaternary structure of the protein. CONCLUSION Given the high level of structural similarity between OxyR from N. meningitidis and E. coli, we conclude that the redox response mechanism is likely to be similar in both species, involving the reversible formation of a disulphide between C199-C208. Modelling suggests that disulphide formation would directly affect the interface between regulatory domains in an OxyR tetramer which in turn may lead to an alteration in the spacing/orientation of the DNA-binding domains and hence the interaction of OxyR with its DNA binding sites.
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Affiliation(s)
- Sarah Sainsbury
- The Oxford Protein Production Facility and Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Roosevelt Drive, Oxford, OX3 7BN, UK
| | - Jingshan Ren
- The Oxford Protein Production Facility and Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Roosevelt Drive, Oxford, OX3 7BN, UK
| | - Joanne E Nettleship
- The Oxford Protein Production Facility and Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Roosevelt Drive, Oxford, OX3 7BN, UK
| | - Nigel J Saunders
- The Bacterial Pathogenesis and Functional Genomics Group, The Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford, OX1 3RE. UK
| | - David I Stuart
- The Oxford Protein Production Facility and Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Roosevelt Drive, Oxford, OX3 7BN, UK
| | - Raymond J Owens
- The Oxford Protein Production Facility and Division of Structural Biology, Henry Wellcome Building for Genomic Medicine, University of Oxford, Roosevelt Drive, Oxford, OX3 7BN, UK
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Bowden TA, Aricescu AR, Nettleship JE, Siebold C, Rahman-Huq N, Owens RJ, Stuart DI, Jones EY. Structural Plasticity of Eph-Receptor A4 Facilitates Cross-Class Ephrin Signaling. Structure 2009; 17:1679. [PMID: 28903018 PMCID: PMC5610144 DOI: 10.1016/j.str.2009.11.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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39
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Bowden TA, Aricescu AR, Nettleship JE, Siebold C, Rahman-Huq N, Owens RJ, Stuart DI, Jones EY. Structural plasticity of eph receptor A4 facilitates cross-class ephrin signaling. Structure 2009; 17:1386-97. [PMID: 19836338 PMCID: PMC2832735 DOI: 10.1016/j.str.2009.07.018] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2009] [Revised: 07/12/2009] [Accepted: 07/30/2009] [Indexed: 01/07/2023]
Abstract
The EphA4 tyrosine kinase cell surface receptor regulates an array of physiological processes and is the only currently known class A Eph receptor that binds both A and B class ephrins with high affinity. We have solved the crystal structure of the EphA4 ligand binding domain alone and in complex with (1) ephrinB2 and (2) ephrinA2. This set of structures shows that EphA4 has significant conformational plasticity in its ligand binding face. In vitro binding data demonstrate that it has a higher affinity for class A than class B ligands. Structural analyses, drawing on previously reported Eph receptor structures, show that EphA4 in isolation and in complex with ephrinA2 resembles other class A Eph receptors but on binding ephrinB2 assumes structural hallmarks of the class B Eph receptors. This interactive plasticity reveals EphA4 as a structural chameleon, able to adopt both A and B class Eph receptor conformations, and thus provides a molecular basis for EphA-type cross-class reactivity.
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Affiliation(s)
- Thomas A. Bowden
- Division of Structural Biology, University of Oxford, Henry Wellcome Building of Genomic Medicine, Roosevelt Drive, Oxford OX3 7BN, UK
| | - A. Radu Aricescu
- Division of Structural Biology, University of Oxford, Henry Wellcome Building of Genomic Medicine, Roosevelt Drive, Oxford OX3 7BN, UK
| | - Joanne E. Nettleship
- Oxford Protein Production Facility, University of Oxford, Henry Wellcome Building of Genomic Medicine, Roosevelt Drive, Oxford OX3 7BN, UK
| | - Christian Siebold
- Division of Structural Biology, University of Oxford, Henry Wellcome Building of Genomic Medicine, Roosevelt Drive, Oxford OX3 7BN, UK
| | - Nahid Rahman-Huq
- Oxford Protein Production Facility, University of Oxford, Henry Wellcome Building of Genomic Medicine, Roosevelt Drive, Oxford OX3 7BN, UK
| | - Raymond J. Owens
- Oxford Protein Production Facility, University of Oxford, Henry Wellcome Building of Genomic Medicine, Roosevelt Drive, Oxford OX3 7BN, UK
| | - David I. Stuart
- Division of Structural Biology, University of Oxford, Henry Wellcome Building of Genomic Medicine, Roosevelt Drive, Oxford OX3 7BN, UK
| | - E. Yvonne Jones
- Division of Structural Biology, University of Oxford, Henry Wellcome Building of Genomic Medicine, Roosevelt Drive, Oxford OX3 7BN, UK,Corresponding author
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Abstract
In this chapter, protocols for the growth and transfection of Human Embryonic Kidney (HEK) 293T cells for small scale expression screening and large scale protein production are described. Transient expression in mammalian cells offers a method of rapidly producing glycoproteins with a relatively high throughput. HEK 293T cells, in particular, can be transfected with high efficiency (> 50% cell expression) and are amenable to culture at multi-litre scale. Growing cells in micro-plate format allows screening of large numbers of vectors in parallel to prioritise those amenable to scale-up and purification for subsequent structural or functional studies. The glycoform of the expressed protein can be modified by treating cell cultures with kifunensine which inhibits glycan processing during protein synthesis. This results in the production of a chemically homogeneous glycoprotein with short mannose-rich sugar chains attached to the protein backbone. If required, these can be readily removed by endoglycosidase treatment.
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Affiliation(s)
- Joanne E Nettleship
- Oxford Protein Production Facility, Welcome Trust Centre for Human Genetics, Oxford, UK
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41
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Au K, Ren J, Walter TS, Harlos K, Nettleship JE, Owens RJ, Stuart DI, Esnouf RM. Structures of an alanine racemase from Bacillus anthracis (BA0252) in the presence and absence of (R)-1-aminoethylphosphonic acid (L-Ala-P). Acta Crystallogr Sect F Struct Biol Cryst Commun 2008; 64:327-33. [PMID: 18453697 PMCID: PMC2376406 DOI: 10.1107/s1744309108007252] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2007] [Accepted: 03/17/2008] [Indexed: 11/11/2022]
Abstract
Bacillus anthracis, the causative agent of anthrax, has been targeted by the Oxford Protein Production Facility to validate high-throughput protocols within the Structural Proteomics in Europe project. As part of this work, the structures of an alanine racemase (BA0252) in the presence and absence of the inhibitor (R)-1-aminoethylphosphonic acid (L-Ala-P) have determined by X-ray crystallography to resolutions of 2.1 and 1.47 A, respectively. Difficulties in crystallizing this protein were overcome by the use of reductive methylation. Alanine racemase has attracted much interest as a possible target for anti-anthrax drugs: not only is D-alanine a vital component of the bacterial cell wall, but recent studies also indicate that alanine racemase, which is accessible in the exosporium, plays a key role in inhibition of germination in B. anthracis. These structures confirm the binding mode of L-Ala-P but suggest an unexpected mechanism of inhibition of alanine racemase by this compound and could provide a basis for the design of improved alanine racemase inhibitors with potential as anti-anthrax therapies.
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Affiliation(s)
- Kinfai Au
- Oxford Protein Production Facility, The Henry Wellcome Building for Genomic Medicine, Oxford University, Roosevelt Drive, Oxford OX3 7BN, England
- Division of Structural Biology, The Henry Wellcome Building for Genomic Medicine, Oxford University, Roosevelt Drive, Oxford OX3 7BN, England
| | - Jingshan Ren
- Oxford Protein Production Facility, The Henry Wellcome Building for Genomic Medicine, Oxford University, Roosevelt Drive, Oxford OX3 7BN, England
- Division of Structural Biology, The Henry Wellcome Building for Genomic Medicine, Oxford University, Roosevelt Drive, Oxford OX3 7BN, England
| | - Thomas S. Walter
- Oxford Protein Production Facility, The Henry Wellcome Building for Genomic Medicine, Oxford University, Roosevelt Drive, Oxford OX3 7BN, England
| | - Karl Harlos
- Oxford Protein Production Facility, The Henry Wellcome Building for Genomic Medicine, Oxford University, Roosevelt Drive, Oxford OX3 7BN, England
- Division of Structural Biology, The Henry Wellcome Building for Genomic Medicine, Oxford University, Roosevelt Drive, Oxford OX3 7BN, England
| | - Joanne E. Nettleship
- Oxford Protein Production Facility, The Henry Wellcome Building for Genomic Medicine, Oxford University, Roosevelt Drive, Oxford OX3 7BN, England
| | - Raymond J. Owens
- Oxford Protein Production Facility, The Henry Wellcome Building for Genomic Medicine, Oxford University, Roosevelt Drive, Oxford OX3 7BN, England
| | - David I. Stuart
- Oxford Protein Production Facility, The Henry Wellcome Building for Genomic Medicine, Oxford University, Roosevelt Drive, Oxford OX3 7BN, England
- Division of Structural Biology, The Henry Wellcome Building for Genomic Medicine, Oxford University, Roosevelt Drive, Oxford OX3 7BN, England
| | - Robert M. Esnouf
- Oxford Protein Production Facility, The Henry Wellcome Building for Genomic Medicine, Oxford University, Roosevelt Drive, Oxford OX3 7BN, England
- Division of Structural Biology, The Henry Wellcome Building for Genomic Medicine, Oxford University, Roosevelt Drive, Oxford OX3 7BN, England
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42
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Ren J, Nettleship JE, Sainsbury S, Saunders NJ, Owens RJ. Structure of the cold-shock domain protein from Neisseria meningitidis reveals a strand-exchanged dimer. Acta Crystallogr Sect F Struct Biol Cryst Commun 2008; 64:247-51. [PMID: 18391418 DOI: 10.1107/s1744309108005411] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2007] [Accepted: 02/26/2008] [Indexed: 11/11/2022]
Abstract
The structure of the cold-shock domain protein from Neisseria meningitidis has been solved to 2.6 A resolution and shown to comprise a dimer formed by the exchange of two beta-strands between protein monomers. The overall fold of the monomer closely resembles those of other bacterial cold-shock proteins. The neisserial protein behaved as a monomer in solution and was shown to bind to a hexathymidine oligonucleotide with a stoichiometry of 1:1 and a K(d) of 1.25 microM.
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Affiliation(s)
- Jingshan Ren
- The Oxford Protein Production Facility, Henry Wellcome Building for Genomic Medicine, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, England
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43
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Zaccai NR, Carter LG, Berrow NS, Sainsbury S, Nettleship JE, Walter TS, Harlos K, Owens RJ, Wilson KS, Stuart DI, Esnouf RM. Crystal structure of a 3-oxoacyl-(acylcarrier protein) reductase (BA3989) from Bacillus anthracis at 2.4-A resolution. Proteins 2008; 70:562-7. [PMID: 17894349 DOI: 10.1002/prot.21624] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Nathan R Zaccai
- The Oxford Protein Production Facility, Division of Structural Biology, University of Oxford, Roosevelt Drive, Oxford, OX3 7BN, United Kingdom
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44
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Nettleship JE, Jones TH, Channer KS, Jones RD. Physiological testosterone replacement therapy attenuates fatty streak formation and improves high-density lipoprotein cholesterol in the Tfm mouse: an effect that is independent of the classic androgen receptor. Circulation 2007; 116:2427-34. [PMID: 17984376 DOI: 10.1161/circulationaha.107.708768] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Research supports a beneficial effect of physiological testosterone on cardiovascular disease. The mechanisms by which testosterone produces these effects have yet to be elucidated. The testicular feminized (Tfm) mouse exhibits a nonfunctional androgen receptor and low circulating testosterone concentrations. We used the Tfm mouse to determine whether testosterone modulates atheroma formation via its classic signaling pathway involving the nuclear androgen receptor, conversion to 17beta-estradiol, or an alternative signaling pathway. METHODS AND RESULTS Tfm mice (n=31) and XY littermates (n=8) were separated into 5 experimental groups. Each group received saline (Tfm, n=8; XY littermates, n=8), physiological testosterone alone (Tfm, n=8), physiological testosterone in conjunction with the estrogen receptor alpha antagonist fulvestrant (Tfm, n=8), or physiological testosterone in conjunction with the aromatase inhibitor anastrazole (Tfm, n=7). All groups were fed a cholesterol-enriched diet for 28 weeks. Serial sections from the aortic root were examined for fatty streak formation. Blood was collected for measurement of total cholesterol, high-density lipoprotein cholesterol (HDLC), non-HDLC, testosterone, and 17beta-estradiol. Physiological testosterone replacement significantly reduced fatty streak formation in Tfm mice compared with placebo-treated controls (0.37+/-0.07% versus 2.86+/-0.39%, respectively; P < or = 0.0001). HDLC concentrations also were significantly raised in Tfm mice receiving physiological testosterone replacement compared with those receiving placebo (2.81+/-0.30 versus 2.08+/-0.09 mmol/L, respectively; P = 0.05). Cotreatment with either fulvestrant or anastrazole completely abolished the improvement in HDLC. CONCLUSION Physiological testosterone replacement inhibited fatty streak formation in the Tfm mouse, an effect that was independent of the androgen receptor. The observed increase in HDLC is consistent with conversion to 17beta-estradiol.
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Affiliation(s)
- Joanne E Nettleship
- Academic Unit of Diabetes, Endocrinology & Metabolism, University of Sheffield, Sheffield, UK.
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45
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Chang VT, Crispin M, Aricescu AR, Harvey DJ, Nettleship JE, Fennelly JA, Yu C, Boles KS, Evans EJ, Stuart DI, Dwek RA, Jones EY, Owens RJ, Davis SJ. Glycoprotein structural genomics: solving the glycosylation problem. Structure 2007; 15:267-73. [PMID: 17355862 PMCID: PMC1885966 DOI: 10.1016/j.str.2007.01.011] [Citation(s) in RCA: 222] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2006] [Revised: 01/08/2007] [Accepted: 01/08/2007] [Indexed: 10/29/2022]
Abstract
Glycoproteins present special problems for structural genomic analysis because they often require glycosylation in order to fold correctly, whereas their chemical and conformational heterogeneity generally inhibits crystallization. We show that the "glycosylation problem" can be solved by expressing glycoproteins transiently in mammalian cells in the presence of the N-glycosylation processing inhibitors, kifunensine or swainsonine. This allows the correct folding of the glycoproteins, but leaves them sensitive to enzymes, such as endoglycosidase H, that reduce the N-glycans to single residues, enhancing crystallization. Since the scalability of transient mammalian expression is now comparable to that of bacterial systems, this approach should relieve one of the major bottlenecks in structural genomic analysis.
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Affiliation(s)
- Veronica T. Chang
- Nuffield Department of Clinical Medicine and MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, United Kingdom
| | - Max Crispin
- Division of Structural Biology and Oxford Protein Production Facility, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, United Kingdom
- Oxford Glycobiology Institute, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom
| | - A. Radu Aricescu
- Division of Structural Biology and Oxford Protein Production Facility, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, United Kingdom
| | - David J. Harvey
- Oxford Glycobiology Institute, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom
| | - Joanne E. Nettleship
- Division of Structural Biology and Oxford Protein Production Facility, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, United Kingdom
| | - Janet A. Fennelly
- Nuffield Department of Clinical Medicine and MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, United Kingdom
| | - Chao Yu
- Nuffield Department of Clinical Medicine and MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, United Kingdom
| | - Kent S. Boles
- Nuffield Department of Clinical Medicine and MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, United Kingdom
| | - Edward J. Evans
- Nuffield Department of Clinical Medicine and MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, United Kingdom
| | - David I. Stuart
- Division of Structural Biology and Oxford Protein Production Facility, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, United Kingdom
| | - Raymond A. Dwek
- Oxford Glycobiology Institute, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom
| | - E. Yvonne Jones
- Division of Structural Biology and Oxford Protein Production Facility, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, United Kingdom
| | - Raymond J. Owens
- Division of Structural Biology and Oxford Protein Production Facility, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, United Kingdom
- Corresponding author
| | - Simon J. Davis
- Nuffield Department of Clinical Medicine and MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, United Kingdom
- Corresponding author
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Nettleship JE, Pugh PJ, Channer KS, Jones T, Jones RD. Inverse relationship between serum levels of interleukin-1beta and testosterone in men with stable coronary artery disease. Horm Metab Res 2007; 39:366-71. [PMID: 17533579 DOI: 10.1055/s-2007-976543] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
OBJECTIVES To examine the relationship between serum levels of inflammatory cytokines and testosterone in men with stable coronary artery disease (CAD). Evidence supports a beneficial effect of testosterone upon objective measures of myocardial ischaemia in men with CAD, and in animal models of atherosclerosis. Inflammatory cytokines are involved in many stages of the atherosclerotic process, however, the effect of testosterone upon inflammatory cytokines within the cardiovascular system is largely unknown. METHODS Serum was collected from 69 men (59+/-1 years) having >75% occlusion of 1, 2, or 3 coronary arteries. Levels of total testosterone (TT), bioavailable testosterone (BT), tumour necrosis factor-alpha (TNFalpha), interleukin (IL)-1-beta (IL-1beta), IL-6 and IL-10 were measured and analysis made between men with 1, 2, or 3 vessel CAD, and between men with hypogonadal, borderline hypogonadal and eugonadal serum levels of testosterone. RESULTS In patients with 1, 2, or 3 vessel CAD, significant stepwise increases were observed in levels of IL-1beta: 0.16+/-0.03, 0.22+/-0.06, and 0.41+/-0.08 pg/ml (p=0.035), and IL-10: 0.93+/-0.11, 1.17+/-0.14, and 2.94+/-0.65 pg/ml (p=0.008). A significant stepwise increase in levels of IL-1beta was also observed in eugonadal, borderline hypogonadal, and hypogonadal men: 0.19+/-0.05, 0.29+/-0.05, and 0.46+/-0.13 pg/ml (p=0.047). CONCLUSION Consequently this data implicates IL-1beta and IL-10 in the pathogenesis of CAD and suggests that testosterone may regulate IL-1beta activity in men with CAD.
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Affiliation(s)
- J E Nettleship
- Hormone & Vascular Biology Group, Academic Unit of Diabetes Endocrinology & Metabolism, The University of Sheffield Medical School, Sheffield, UK
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47
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Nettleship JE, Aplin R, Aricescu AR, Evans EJ, Davis SJ, Crispin M, Owens RJ. Analysis of variable N-glycosylation site occupancy in glycoproteins by liquid chromatography electrospray ionization mass spectrometry. Anal Biochem 2007; 361:149-51. [PMID: 17178093 DOI: 10.1016/j.ab.2006.11.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2006] [Accepted: 11/06/2006] [Indexed: 11/18/2022]
Affiliation(s)
- Joanne E Nettleship
- Oxford Protein Production Facility, Wellcome Trust Center for Human Genetics, University of Oxford, Oxford OX3 7BN, UK.
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48
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Walter TS, Meier C, Assenberg R, Au KF, Ren J, Verma A, Nettleship JE, Owens RJ, Stuart DI, Grimes JM. Lysine methylation as a routine rescue strategy for protein crystallization. Structure 2007; 14:1617-22. [PMID: 17098187 PMCID: PMC7126202 DOI: 10.1016/j.str.2006.09.005] [Citation(s) in RCA: 210] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2006] [Revised: 08/28/2006] [Accepted: 09/01/2006] [Indexed: 11/24/2022]
Abstract
Crystallization remains a critical step in X-ray structure determination. Because it is not generally possible to rationally predict crystallization conditions, commercial screens have been developed which sample a wide range of crystallization space. While this approach has proved successful in many cases, a significant number of proteins fail to crystallize despite being soluble and monodispersed. It is established that chemical modification can facilitate the crystallization of otherwise intractable proteins. Here we describe a method for the reductive methylation of lysine residues which is simple, inexpensive, and efficient, and report on its application to ten proteins. We describe the effect of methylation on the physico-chemical properties of these proteins, and show that it led to diffraction-quality crystals from four proteins and structures for three that had hitherto proved refractory to crystallization. The method is suited to both low- and high-throughput laboratories.
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Affiliation(s)
- Thomas S Walter
- Oxford Protein Production Facility, The Henry Wellcome Building for Genomic Medicine, Oxford University, Roosevelt Drive, Oxford OX3 7BN, United Kingdom
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49
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Geerlof A, Brown J, Coutard B, Egloff MP, Enguita FJ, Fogg MJ, Gilbert RJC, Groves MR, Haouz A, Nettleship JE, Nordlund P, Owens RJ, Ruff M, Sainsbury S, Svergun DI, Wilmanns M. The impact of protein characterization in structural proteomics. Acta Crystallogr D Biol Crystallogr 2006; 62:1125-36. [PMID: 17001090 PMCID: PMC7161605 DOI: 10.1107/s0907444906030307] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 11/30/2005] [Accepted: 08/02/2006] [Indexed: 11/10/2022]
Abstract
Protein characterization plays a role in two key aspects of structural proteomics. The first is the quality assessment of the produced protein preparations. Obtaining well diffracting crystals is one of the major bottlenecks in the structure-determination pipeline. Often, this is caused by the poor quality of the protein preparation used for crystallization trials. Hence, it is essential to perform an extensive quality assessment of the protein preparations prior to crystallization and to use the results in the evaluation of the process. Here, a protein-production and crystallization strategy is proposed with threshold values for protein purity (95%) and monodispersity (85%) below which a further optimization of the protein-production process is strongly recommended. The second aspect is the determination of protein characteristics such as domains, oligomeric state, post-translational modifications and protein-protein and protein-ligand interactions. In this paper, applications and new developments of protein-characterization methods using MS, fluorescence spectroscopy, static light scattering, analytical ultracentrifugation and small-angle X-ray scattering within the EC Structural Proteomics in Europe contract are described. Examples of the application of the various methods are given.
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Affiliation(s)
- Arie Geerlof
- EMBL Hamburg Outstation, Notkestrasse 85, Hamburg, Germany.
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50
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Abstract
Two of the strongest independent risk factors for coronary heart disease (CHD) are increasing age and male sex. Despite a wide variance in CHD mortality between countries, men are consistently twice as likely to die from CHD than their female counterparts. This sex difference has been attributed to a protective effect of female sex hormones, and a deleterious effect of male sex hormones, upon the cardiovascular system. However, little evidence suggests that testosterone exerts cardiovascular harm. In fact, serum levels of testosterone decline with age, and low testosterone is positively associated with other cardiovascular risk factors. Furthermore, testosterone exhibits a number of potential cardioprotective actions. For example, testosterone treatment is reported to reduce serum levels of the pro-inflammatory cytokines interleukin (IL)-1beta and tumor necrosis factor (TNF)-alpha, and to increase levels of the anti-inflammatory cytokine IL-10; to reduce vascular cell adhesion molecule (VCAM)-1 expression in aortic endothelial cells; to promote vascular smooth muscle and endothelial cell proliferation; to induce vasodilatation and to improve vascular reactivity, to reduce serum levels of the pro-thrombotic factors plasminogen activator inhibitor (PAI)-1 and fibrinogen; to reduce low-density lipoprotein-cholesterol (LDL-C); to improve insulin sensitivity; and to reduce body mass index and visceral fat mass. These actions of testosterone may confer cardiovascular benefit since testosterone therapy reduces atheroma formation in cholesterol-fed animal models, and reduces myocardial ischemia in men with CHD. Consequently, an alternative hypothesis is that an age-related decline in testosterone contributes to the atherosclerotic process. This is supported by recent findings, which suggest that as many as one in four men with CHD have serum levels of testosterone within the clinically hypogonadal range. Consequently, restoration of serum levels of testosterone via testosterone replacement therapy could offer cardiovascular, as well as other, clinical advantages to these individuals.
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Affiliation(s)
- Richard D Jones
- Academic Unit of Endocrinology, Division of Genomic Medicine, Hormone & Vascular Biology Group, The University of Sheffield, Sheffield, UK.
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