1
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Küpper H, Gokul A, Alavez D, Dhungana SR, Bokhari SNH, Keyster M, Mendoza-Cozatl DG. Identification and characterization of transition metal-binding proteins and metabolites in the phloem sap of Brassica napus. J Biol Chem 2024:107741. [PMID: 39222686 DOI: 10.1016/j.jbc.2024.107741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 08/07/2024] [Accepted: 08/23/2024] [Indexed: 09/04/2024] Open
Abstract
Transition metal (TM) distribution through the phloem is an essential part of plant metabolism and is required for systemic signaling and balancing source-to-sink relationships. Due to their reactivity, TMs are expected to occur in complexes within the phloem sap; however, metal speciation in the phloem sap remains largely unexplored. Here, we isolated phloem sap from Brassica napus and analyzed it via size exclusion chromatography (SEC) coupled online to sector-field ICP-MS. Our data identified known TM binding proteins and molecules including metallothioneins (MT), glutathione, and nicotianamine. While the main peak of all metals was low MW (∼1.5 kD), additional peaks ∼10-15 kD containing Cu, Fe, S and Zn were also found. Further physicochemical analyses of MTs with and without affinity tags corroborated that MTs can form complexes of diverse molecular weights. We also identified and characterized potential artifacts in the TM-biding ability of B. napus MTs between tagged and non-tagged MTs. That is, the native BnMT2 binds Zn, Cu and Fe, while MT3a and MT3b only bind Cu and Zn. In contrast, his-tagged MTs bind less Cu and were found to bind Co and Mn and aggregated to oligomeric forms to a greater extent compared to the phloem sap. Our data indicates that TM chemistry in the phloem sap is more complex than previously anticipated and that more systematic analyses are needed to establish the precise speciation of TM and TM-ligand complexes within the phloem sap.
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Affiliation(s)
- Hendrik Küpper
- Czech Academy of Sciences, Biology Centre, Institute of Plant Molecular Biology, Laboratory of Plant Biophysics and Biochemistry, Branišovská 31/1160, 370 05 České Budějovice, Czech Republic; University of South Bohemia, Department of Experimental Plant Biology, Branišovská 31/1160, 370 05 České Budějovice, Czech Republic.
| | - Arun Gokul
- Department of Plant Sciences, Qwaqwa Campus, University of the Free State, Phuthaditjhaba 9866, South Africa
| | - Dario Alavez
- Division of Plant Sciences, University of Missouri-Columbia, 1201 Rollins St, Bond Life Sciences Center, Room 271F, Columbia, Missouri 65211, USA
| | - Singha R Dhungana
- Division of Biological Sciences, University of Missouri-Columbia, 105 Tucker Hall, Columbia, Missouri 65211, USA
| | - Syed Nadeem Hussain Bokhari
- Czech Academy of Sciences, Biology Centre, Institute of Plant Molecular Biology, Laboratory of Plant Biophysics and Biochemistry, Branišovská 31/1160, 370 05 České Budějovice, Czech Republic
| | - Marshall Keyster
- Environmental Biotechnology Laboratory, Department of Biotechnology, University of the Western Cape, Bellville 7535, South Africa
| | - David G Mendoza-Cozatl
- Division of Plant Sciences, University of Missouri-Columbia, 1201 Rollins St, Bond Life Sciences Center, Room 271F, Columbia, Missouri 65211, USA; Environmental Biotechnology Laboratory, Department of Biotechnology, University of the Western Cape, Bellville 7535, South Africa.
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2
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Bae J, Kim J, Choi J, Lee H, Koh M. Split Proteins and Reassembly Modules for Biological Applications. Chembiochem 2024; 25:e202400123. [PMID: 38530024 DOI: 10.1002/cbic.202400123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 03/24/2024] [Accepted: 03/26/2024] [Indexed: 03/27/2024]
Abstract
Split systems, modular entities enabling controlled biological processes, have become instrumental in biological research. This review highlights their utility across applications like gene regulation, protein interaction identification, and biosensor development. Covering significant progress over the last decade, it revisits traditional split proteins such as GFP, luciferase, and inteins, and explores advancements in technologies like Cas proteins and base editors. We also examine reassembly modules and their applications in diverse fields, from gene regulation to therapeutic innovation. This review offers a comprehensive perspective on the recent evolution of split systems in biological research.
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Affiliation(s)
- Jieun Bae
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan, 46241, Republic of Korea
| | - Jonghoon Kim
- Department of Chemistry and Integrative Institute of Basic Science, Soongsil University, Seoul, 06978, Republic of Korea
| | - Jongdoo Choi
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan, 46241, Republic of Korea
| | - Hwiyeong Lee
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan, 46241, Republic of Korea
| | - Minseob Koh
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan, 46241, Republic of Korea
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3
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Mei M, Fan X, Zhou Y, Zhang F, Zhang G, Yi L. A combinatorial strategy for HRV 3C protease engineering to achieve the N-terminal free cleavage. Int J Biol Macromol 2024; 265:131066. [PMID: 38521339 DOI: 10.1016/j.ijbiomac.2024.131066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 03/07/2024] [Accepted: 03/20/2024] [Indexed: 03/25/2024]
Abstract
Human rhinovirus 3C protease (HRV 3CP) has a high specificity against the substrate of LEVLFQ↓G at P1' site, which plays an important role in biotechnology and academia as a fusion tag removal tool. However, a non-ignorable limitation is that an extra residue of Gly would remain at the N terminus of the recombinant target protein after cleavage with HRV 3CP, thus potentially causing protein mis-functionality or immunogenicity. Here, we developed a combinatorial strategy by integrating structure-guided library design and high-throughput screening of eYESS approach for HRV 3CP engineering to expand its P1' specificity. Finally, a C3 variant was obtained, exhibiting a broad substrate P1' specificity to recognize 20 different amino acids with the highest activity against LEVLFQ↓M (kcat/KM = 3.72 ± 0.04 mM-1∙s-1). Further biochemical and NGS-mediated substrate profiling analysis showed that C3 variant still kept its substrate stringency at P1 site and good residue tolerance at P2' site, but with an expanded P1' specificity. Structural simulation of C3 indicated a reconstructed S1' binding pocket as well as new interactions with the substrates. Overall, our studies here prompt not only the practical applications and understanding of substrate recognition mechanisms of HRV 3CP, also provide new tools for other enzyme engineering.
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Affiliation(s)
- Meng Mei
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Xian Fan
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Yu Zhou
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Faying Zhang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Guimin Zhang
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Li Yi
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China.
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4
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Xu J, Nakanishi T, Kato T, Park E. In vivo enzymatic digestion of HRV 3C protease cleavage sites-containing proteins produced in a silkworm-baculovirus expression system. Biosci Rep 2022; 42:BSR20220739. [PMID: 35642592 PMCID: PMC9202508 DOI: 10.1042/bsr20220739] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 05/20/2022] [Accepted: 05/31/2022] [Indexed: 12/30/2022] Open
Abstract
Baculovirus expression vector system (BEVS) has been recognized as a potent protein expression system in engineering valuable enzymes and vaccines. Various fusion tags facilitate protein purification, leaving the potential risk to influence the target protein's biological activity negatively. It is of great interest to consider removing the additional tags using site-specific proteases, such as human rhinoviruses (HRV) 3C protease. The current study validated the cleavage activity of 3C protease in Escherichia coli and silkworm-BEVS systems by mixing the cell or fat body lysates of 3C protein and 3C site containing target protein in vitro. Further verification has been performed in the fat body lysate from co-expression of both constructs, showing remarkable cleavage efficiency in vivo silkworm larvae. We also achieved the glutathione-S-transferase (GST) tag-cleaved product of the VP15 protein from the White spot syndrome virus after purification, suggesting that we successfully established a coinfection-based recognition-and-reaction BEVS platform for the tag-free protein engineering.
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Affiliation(s)
- Jian Xu
- Laboratory of Biotechnology, Green Chemistry Research Division, Research Institute of Green Science and Technology, Shizuoka University, 836 Ohya, Shizuoka 422-8529, Japan
| | - Takafumi Nakanishi
- Department of Agriculture, Graduate School of Integrated Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
| | - Tatsuya Kato
- Laboratory of Biotechnology, Green Chemistry Research Division, Research Institute of Green Science and Technology, Shizuoka University, 836 Ohya, Shizuoka 422-8529, Japan
- Department of Agriculture, Graduate School of Integrated Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
| | - Enoch Y. Park
- Laboratory of Biotechnology, Green Chemistry Research Division, Research Institute of Green Science and Technology, Shizuoka University, 836 Ohya, Shizuoka 422-8529, Japan
- Department of Agriculture, Graduate School of Integrated Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
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5
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Coker JA, Katis VL, Fairhead M, Schwenzer A, Clemmensen SB, Frandsen BU, de Jongh WA, Gileadi O, Burgess-Brown NA, Marsden BD, Midwood KS, Yue WW. FAS2FURIOUS: Moderate-Throughput Secreted Expression of Difficult Recombinant Proteins in Drosophila S2 Cells. Front Bioeng Biotechnol 2022; 10:871933. [PMID: 35600892 PMCID: PMC9117644 DOI: 10.3389/fbioe.2022.871933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 04/04/2022] [Indexed: 11/23/2022] Open
Abstract
Recombinant protein expression in eukaryotic insect cells is a powerful approach for producing challenging targets. However, due to incompatibility with standard baculoviral platforms and existing low-throughput methodology, the use of the Drosophila melanogaster “S2” cell line lags behind more common insect cell lines such as Sf9 or High-Five™. Due to the advantages of S2 cells, particularly for secreted and secretable proteins, the lack of a simple and parallelizable S2-based platform represents a bottleneck, particularly for biochemical and biophysical laboratories. Therefore, we developed FAS2FURIOUS, a simple and rapid S2 expression pipeline built upon an existing low-throughput commercial platform. FAS2FURIOUS is comparable in effort to simple E. coli systems and allows users to clone and test up to 46 constructs in just 2 weeks. Given the ability of S2 cells to express challenging targets, including receptor ectodomains, secreted glycoproteins, and viral antigens, FAS2FURIOUS represents an attractive orthogonal approach for protein expression in eukaryotic cells.
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Affiliation(s)
- Jesse A. Coker
- Centre for Medicines Discovery, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
| | - Vittorio L. Katis
- Centre for Medicines Discovery, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Michael Fairhead
- Centre for Medicines Discovery, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Anja Schwenzer
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
| | | | - Bent U. Frandsen
- ExpreSion Biotechnologies, SCION-DTU Science Park, Hørsholm, Denmark
| | | | - Opher Gileadi
- Centre for Medicines Discovery, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Nicola A. Burgess-Brown
- Centre for Medicines Discovery, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Brian D. Marsden
- Centre for Medicines Discovery, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
| | - Kim S. Midwood
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
| | - Wyatt W. Yue
- Centre for Medicines Discovery, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
- *Correspondence: Wyatt W. Yue,
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6
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Fessler E, Krumwiede L, Jae LT. DELE1 tracks perturbed protein import and processing in human mitochondria. Nat Commun 2022; 13:1853. [PMID: 35388015 PMCID: PMC8986780 DOI: 10.1038/s41467-022-29479-y] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Accepted: 03/11/2022] [Indexed: 12/15/2022] Open
Abstract
Protein homeostatic control of mitochondria is key to age-related diseases and organismal decline. However, it is unknown how the diverse types of stress experienced by mitochondria can be integrated and appropriately responded to in human cells. Here we identify perturbations in the ancient conserved processes of mitochondrial protein import and processing as sources of DELE1 activation: DELE1 is continuously sorted across both mitochondrial membranes into the matrix and detects different types of perturbations along the way. DELE1 molecules in transit can become licensed for mitochondrial release and stress signaling through proteolytic removal of N-terminal sorting signals. Import defects that occur at the mitochondrial surface allow DELE1 precursors to bind and activate downstream factor HRI without the need for cleavage. Genome-wide genetics reveal that DELE1 additionally responds to compromised presequence processing by the matrix proteases PITRM1 and MPP, which are mutated in neurodegenerative diseases. These mechanisms rationalize DELE1-dependent mitochondrial stress integration in the human system and may inform future therapies of neuropathies.
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Affiliation(s)
- Evelyn Fessler
- Gene Center and Department of Biochemistry, Ludwig-Maximilians-Universität München, Feodor-Lynen-Strasse 25, 81377, Munich, Germany.
| | - Luisa Krumwiede
- Gene Center and Department of Biochemistry, Ludwig-Maximilians-Universität München, Feodor-Lynen-Strasse 25, 81377, Munich, Germany
| | - Lucas T Jae
- Gene Center and Department of Biochemistry, Ludwig-Maximilians-Universität München, Feodor-Lynen-Strasse 25, 81377, Munich, Germany.
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7
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Daniels PW, Hama Soor T, Levicky Q, Hettema EH, Mitchell P. Contribution of domain structure to the function of the yeast DEDD family exoribonuclease and RNase T functional homolog, Rex1. RNA (NEW YORK, N.Y.) 2022; 28:493-507. [PMID: 35082142 PMCID: PMC8925975 DOI: 10.1261/rna.078939.121] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Accepted: 01/11/2022] [Indexed: 06/14/2023]
Abstract
The 3' exonucleolytic processing of stable RNAs is conserved throughout biology. Yeast strains lacking the exoribonuclease Rex1 are defective in the 3' processing of stable RNAs, including 5S rRNA and tRNA. The equivalent RNA processing steps in Escherichia coli are carried out by RNase T. Rex1 is larger than RNase T, the catalytic DEDD domain being embedded within uncharacterized amino- and carboxy-terminal regions. Here we report that both amino- and carboxy-terminal regions of Rex1 are essential for its function, as shown by genetic analyses and 5S rRNA profiling. Full-length Rex1, but not mutants lacking amino- or carboxy-terminal regions, accurately processed a 3' extended 5S rRNA substrate. Crosslinking analyses showed that both amino- and carboxy-terminal regions of Rex1 directly contact RNA in vivo. Sequence homology searches identified YFE9 in Schizosaccharomyces pombe and SDN5 in Arabidopsis thaliana as closely related proteins to Rex1. In addition to the DEDD domain, these proteins share a domain, referred to as the RYS (Rex1, YFE9 and SDN5) domain, that includes elements of both the amino- and caroxy-terminal flanking regions. We also characterize a nuclear localization signal in the amino-terminal region of Rex1. These studies reveal a novel dual domain structure at the core of Rex1-related ribonucleases, wherein the catalytic DEDD domain and the RYS domain are aligned such that they both contact the bound substrate. The domain organization of Rex1 is distinct from that of other previously characterized DEDD family nucleases and expands the known repertoire of structures for this fundamental family of RNA processing enzymes.
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Affiliation(s)
- Peter W Daniels
- Department of Molecular Biology and Biotechnology, The University of Sheffield, S10 2TN Sheffield, United Kingdom
| | - Taib Hama Soor
- Department of Molecular Biology and Biotechnology, The University of Sheffield, S10 2TN Sheffield, United Kingdom
| | - Quentin Levicky
- Department of Molecular Biology and Biotechnology, The University of Sheffield, S10 2TN Sheffield, United Kingdom
| | - Ewald H Hettema
- Department of Molecular Biology and Biotechnology, The University of Sheffield, S10 2TN Sheffield, United Kingdom
| | - Phil Mitchell
- Department of Molecular Biology and Biotechnology, The University of Sheffield, S10 2TN Sheffield, United Kingdom
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8
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Hu C, Ke A. Reconstitution and biochemical characterization of the RNA-guided helicase-nuclease protein Cas3 from type I-A CRISPR–Cas system. Methods Enzymol 2022; 673:405-424. [DOI: 10.1016/bs.mie.2022.03.059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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9
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Birch J, Quigley A. The high-throughput production of membrane proteins. Emerg Top Life Sci 2021; 5:655-663. [PMID: 34623416 PMCID: PMC8726054 DOI: 10.1042/etls20210196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2021] [Revised: 09/11/2021] [Accepted: 09/24/2021] [Indexed: 11/17/2022]
Abstract
Membrane proteins, found at the junctions between the outside world and the inner workings of the cell, play important roles in human disease and are used as biosensors. More than half of all therapeutics directly affect membrane protein function while nanopores enable DNA sequencing. The structural and functional characterisation of membrane proteins is therefore crucial. However, low levels of naturally abundant protein and the hydrophobic nature of membrane proteins makes production difficult. To maximise success, high-throughput strategies were developed that rely upon simple screens to identify successful constructs and rapidly exclude those unlikely to work. Parameters that affect production such as expression host, membrane protein origin, expression vector, fusion-tags, encapsulation reagent and solvent composition are screened in parallel. In this way, constructs with divergent requirements can be produced for a variety of structural applications. As structural techniques advance, sample requirements will change. Single-particle cryo-electron microscopy requires less protein than crystallography and as cryo-electron tomography and time-resolved serial crystallography are developed new sample production requirements will evolve. Here we discuss different methods used for the high-throughput production of membrane proteins for structural biology.
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Affiliation(s)
- James Birch
- Membrane Protein Laboratory, Diamond Light Source Ltd., Harwell Science and Innovation Campus, Didcot OX11 0DE, U.K
- Research Complex at Harwell (RCaH), Harwell Science and Innovation Campus, Didcot OX11 0FA, U.K
| | - Andrew Quigley
- Membrane Protein Laboratory, Diamond Light Source Ltd., Harwell Science and Innovation Campus, Didcot OX11 0DE, U.K
- Research Complex at Harwell (RCaH), Harwell Science and Innovation Campus, Didcot OX11 0FA, U.K
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10
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Abiko LA, Rogowski M, Gautier A, Schertler G, Grzesiek S. Efficient production of a functional G protein-coupled receptor in E. coli for structural studies. JOURNAL OF BIOMOLECULAR NMR 2021; 75:25-38. [PMID: 33501610 PMCID: PMC7897205 DOI: 10.1007/s10858-020-00354-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 12/08/2020] [Indexed: 05/22/2023]
Abstract
G protein-coupled receptors (GPCRs) are transmembrane signal transducers which regulate many key physiological process. Since their discovery, their analysis has been limited by difficulties in obtaining sufficient amounts of the receptors in high-quality, functional form from heterologous expression hosts. Albeit highly attractive because of its simplicity and the ease of isotope labeling for NMR studies, heterologous expression of functional GPCRs in E. coli has proven particularly challenging due to the absence of the more evolved protein expression and folding machinery of higher eukaryotic hosts. Here we first give an overview on the previous strategies for GPCR E. coli expression and then describe the development of an optimized robust protocol for the E. coli expression and purification of two mutants of the turkey β1-adrenergic receptor (β1AR) uniformly or selectively labeled in 15N or 2H,15N. These mutants had been previously optimized for thermal stability using insect cell expression and used successfully in crystallographic and NMR studies. The same sequences were then used for E. coli expression. Optimization of E. coli expression was achieved by a quantitative analysis of losses of receptor material at each step of the solubilization and purification procedure. Final yields are 0.2-0.3 mg receptor per liter culture. Whereas both expressed mutants are well folded and competent for orthosteric ligand binding, the less stable YY-β1AR mutant also comprises the two native tyrosines Y5.58 and Y7.53, which enable G protein binding. High-quality 1H-15N TROSY spectra were obtained for E. coli-expressed YY-β1AR in three different functional states (antagonist, agonist, and agonist + G protein-mimicking nanobody-bound), which are identical to spectra obtained of the same forms of the receptor expressed in insect cells. NdeI and AgeI restriction sites introduced into the expression plasmid allow for the easy replacement of the receptor gene by other GPCR genes of interest, and the provided quantitative workflow analysis may guide the respective adaptation of the purification protocol.
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Affiliation(s)
- Layara Akemi Abiko
- Focal Area Structural Biology and Biophysics, Biozentrum, University of Basel, 4056, Basel, Switzerland.
| | - Marco Rogowski
- Focal Area Structural Biology and Biophysics, Biozentrum, University of Basel, 4056, Basel, Switzerland
| | - Antoine Gautier
- Focal Area Structural Biology and Biophysics, Biozentrum, University of Basel, 4056, Basel, Switzerland
- Paul Scherrer Institute, 5232, Villigen, Switzerland
| | | | - Stephan Grzesiek
- Focal Area Structural Biology and Biophysics, Biozentrum, University of Basel, 4056, Basel, Switzerland.
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11
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Structural Basis for the Activation and Target Site Specificity of CDC7 Kinase. Structure 2020; 28:954-962.e4. [PMID: 32521228 PMCID: PMC7416108 DOI: 10.1016/j.str.2020.05.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 05/11/2020] [Accepted: 05/19/2020] [Indexed: 12/13/2022]
Abstract
CDC7 is an essential Ser/Thr kinase that acts upon the replicative helicase throughout the S phase of the cell cycle and is activated by DBF4. Here, we present crystal structures of a highly active human CDC7-DBF4 construct. The structures reveal a zinc-finger domain at the end of the kinase insert 2 that pins the CDC7 activation loop to motif M of DBF4 and the C lobe of CDC7. These interactions lead to ordering of the substrate-binding platform and full opening of the kinase active site. In a co-crystal structure with a mimic of MCM2 Ser40 phosphorylation target, the invariant CDC7 residues Arg373 and Arg380 engage phospho-Ser41 at substrate P+1 position, explaining the selectivity of the S-phase kinase for Ser/Thr residues followed by a pre-phosphorylated or an acidic residue. Our results clarify the role of DBF4 in activation of CDC7 and elucidate the structural basis for recognition of its preferred substrates. DBF4 activates CDC7 kinase via a two-step mechanism Zinc-finger domain in CDC7 KI2 interacts with DBF4 motif M Invariant CDC7 residues Arg373 and Arg380 engage P+1 substrate site
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12
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Zafar M, Shah MA, Shehzad A, Tariq A, Habib M, Muddassar M, Shah MS, Iqbal M, Hemmatzadeh F, Rahman M. Characterization of the highly immunogenic VP2 protrusion domain as a diagnostic antigen for members of Birnaviridae family. Appl Microbiol Biotechnol 2020; 104:3391-3402. [PMID: 32088761 PMCID: PMC7222154 DOI: 10.1007/s00253-020-10458-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Revised: 01/31/2020] [Accepted: 02/10/2020] [Indexed: 11/13/2022]
Abstract
Birnaviridae is a family of viruses (birnaviruses) which consists of four genera, members of which cause diseases in fish, birds, mollusks, and insects. The genome of birnaviruses encodes the highly immunogenic VP2 capsid protein. In order to demonstrate that the VP2 protein can be exploited as a diagnostic antigen for birnaviruses, we developed a lateral flow assay based on the surface-exposed VP2 protrusion domain of a representative birnavirus, infectious bursal disease virus (IBDV) of serotype 1 which causes the highly devastating infectious bursal disease in chickens. The biophysical characterization of the purified domain reveals that the domain predominantly consists of β-sheets, exists in a trimeric form, and remains folded at high temperatures, making it suitable for diagnostic purposes. Owing to its highly immunogenic nature and excellent biophysical properties, we employed the VP2 protrusion domain in a gold nanoparticle-based lateral flow assay for rapid detection of anti-IBDV antibodies in serum samples of infected chickens. Our results indicate that the domain binds anti-IBDV antibodies with high specificity during laboratory testing and on-site testing. The lateral flow assay reported here yields comparable results in a qualitative manner as obtained through a commercial enzyme-linked immunosorbent assay (ELISA). As VP2 is a common capsid protein of birnaviruses, the lateral flow assay can be generalized for other birnaviruses, and members of Tetraviridae and Nodaviridae families which contain homologous VP2 capsid proteins.
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Affiliation(s)
- Maryam Zafar
- Drug Discovery and Structural Biology Group, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan.,Pakistan Institute of Engineering and Applied Sciences (PIEAS), P.O. Nilore, Islamabad, Pakistan.,School of Animal and Veterinary Sciences, Roseworthy Campus, The University of Adelaide, Roseworthy, South Australia,, 5371, Australia
| | - Majid Ali Shah
- Drug Discovery and Structural Biology Group, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan.,Pakistan Institute of Engineering and Applied Sciences (PIEAS), P.O. Nilore, Islamabad, Pakistan
| | - Aamir Shehzad
- Drug Discovery and Structural Biology Group, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan.,Pakistan Institute of Engineering and Applied Sciences (PIEAS), P.O. Nilore, Islamabad, Pakistan
| | - Anam Tariq
- Drug Discovery and Structural Biology Group, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan.,Pakistan Institute of Engineering and Applied Sciences (PIEAS), P.O. Nilore, Islamabad, Pakistan
| | - Mudasser Habib
- Vaccine Development Group, Animal Sciences Division, NIAB, Faisalabad, Pakistan
| | - Muhammad Muddassar
- Department of Biosciences, COMSATS-University Islamabad, Park Road, Islamabad, Pakistan
| | | | - Mazhar Iqbal
- Drug Discovery and Structural Biology Group, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan.,Pakistan Institute of Engineering and Applied Sciences (PIEAS), P.O. Nilore, Islamabad, Pakistan
| | - Farhid Hemmatzadeh
- School of Animal and Veterinary Sciences, Roseworthy Campus, The University of Adelaide, Roseworthy, South Australia,, 5371, Australia.
| | - Moazur Rahman
- Drug Discovery and Structural Biology Group, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan. .,Pakistan Institute of Engineering and Applied Sciences (PIEAS), P.O. Nilore, Islamabad, Pakistan. .,School of Animal and Veterinary Sciences, Roseworthy Campus, The University of Adelaide, Roseworthy, South Australia,, 5371, Australia.
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13
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Abstract
The selective immobilization of proteins represents an essential step in the selection of binding proteins such as antibodies. The immobilization strategy determines how the target protein is presented to the binders and thereby directly affects the experimental outcome. This poses specific challenges for membrane proteins due to their inherent lack of stability and limited exposed hydrophilic surfaces. Here we detail methodologies for the selective immobilization of membrane proteins based on the strong biotin-avidin interaction and with a specific focus on its application for the selection of nanobodies and sybodies. We discuss the challenges in generating and benefits of obtaining an equimolar biotin to target-protein ratio.
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14
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Wang S, Cho YK. Yeast surface display of full-length human microtubule-associated protein tau. Biotechnol Prog 2019; 36:e2920. [PMID: 31581367 DOI: 10.1002/btpr.2920] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 08/15/2019] [Accepted: 09/16/2019] [Indexed: 12/24/2022]
Abstract
Microtubule-associated protein tau is an intrinsically disordered, highly soluble protein found primarily in neurons. Under normal conditions, tau regulates the stability of axonal microtubules and intracellular vesicle transport. However, in patients of neurodegeneration such as Alzheimer's disease (AD), tau forms neurofibrillary deposits, which correlates well with the disease progression. Identifying molecular signatures in tau, such as posttranslational modification, truncation, and conformational change has great potential to detect earliest signs of neurodegeneration and develop therapeutic strategies. Here, we show that full-length human tau, including the longest isoform found in the adult brain, can be robustly displayed on the surface of yeast Saccharomyces cerevisiae. Yeast-displayed tau binds to anti-tau antibodies that cover epitopes ranging from the N-terminus to the 4R repeat region. Unlike tau expressed in the yeast cytosol, surface-displayed tau was not phosphorylated at sites found in AD patients (probed by antibodies AT8, AT270, AT180, and PHF-1). However, yeast-displayed tau showed clear binding to paired helical filament (PHF) tau conformation-specific antibodies Alz-50, MC-1, and Tau-2. Although the tau possessed a conformation found in PHFs, oligomerization or aggregation into larger filaments was undetected. Taken together, yeast-displayed tau enables robust measurement of protein interactions and is of particular interest for characterizing conformational change.
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Affiliation(s)
- Shiyao Wang
- Department of Chemical and Biomolecular Engineering, Institute for Systems Genomics, CT Institute for the Brain and Cognitive Sciences, University of Connecticut, Storrs, CT
| | - Yong Ku Cho
- Department of Chemical and Biomolecular Engineering, Institute for Systems Genomics, CT Institute for the Brain and Cognitive Sciences, University of Connecticut, Storrs, CT.,Department of Biomedical Engineering, Institute for Systems Genomics, CT Institute for the Brain and Cognitive Sciences, University of Connecticut, Storrs, CT
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15
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Khurana L, ElGindi M, Tilstam PV, Pantouris G. Elucidating the role of an immunomodulatory protein in cancer: From protein expression to functional characterization. Methods Enzymol 2019; 629:307-360. [PMID: 31727247 DOI: 10.1016/bs.mie.2019.05.053] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Several fundamental discoveries made over the last two decades, in the field of cancer biology, have increased our understanding of the complex tumor micro- and macroenvironments. This has shifted the current empirical cancer therapies to more rationalized treatments targeting immunomodulatory proteins. From the point of identification, a protein target undergoes several interrogations, which are necessary to truly define its druggability. Here, we outline some basic steps that can be followed for in vitro characterization of a potential immunomodulatory protein target. We describe procedures for recombinant protein expression and purification including key annotations on protein cloning, expression systems, purification strategies and protein characterization using structural and biochemical approaches. For functional characterization, we provide detailed protocols for using flow-cytometric techniques in cell lines or primary cells to study protein expression profiles, proliferation, apoptosis and cell-cycle changes. This multilevel approach can provide valuable, in-depth understanding of any protein target with potential immunomodulatory effects.
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Affiliation(s)
- Leepakshi Khurana
- Department of Pharmacology, School of Medicine, Yale University, New Haven, CT, United States
| | - Mei ElGindi
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, United States
| | - Pathricia V Tilstam
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, United States
| | - Georgios Pantouris
- Department of Pharmacology, School of Medicine, Yale University, New Haven, CT, United States; Department of Chemistry, University of the Pacific, Stockton, CA, United States.
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16
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Abstract
Binding of calcium - and small molecules in general - often induce conformational changes in large molecules and complexes. The degree and type of change varies, but the resulting shift in specific affinities ultimately induces a physiological response. It is therefore important for our understanding of responses at the cellular level to define coupled changes at the molecular level.Calumenin, a six-EF-hand calcium-binding protein localized in the endoplasmic reticulum, undergoes substantial calcium-induced rearrangement. We have demonstrated how calumenin changes from being unfolded in the absence of calcium to a compact trilobal fold in the presence of calcium (Mazzorana et al., PLoS One 11:e0151547, 2016).Here, we describe protocols for the expression and purification of calumenin and calmodulin, another EF-hand protein modulated by calcium, along with protocols for biophysical techniques used to characterize calcium-induced changes to protein conformation. Analytical size-exclusion chromatography in the presence and absence of calcium provides an informed indication of any larger conformational movements. Circular dichroism spectroscopy reveals alterations to the secondary or tertiary structure, while small-angle X-ray scattering explores changes further providing low-resolution conformational details.Surface plasmon resonance estimates binding kinetics and affinities completing the biophysical description of these events.
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Affiliation(s)
- Marco Mazzorana
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, UK
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17
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Liu J, Cheng R, Wu H, Li S, Wang PG, DeGrado WF, Rozovsky S, Wang L. Building and Breaking Bonds via a Compact S-Propargyl-Cysteine to Chemically Control Enzymes and Modify Proteins. Angew Chem Int Ed Engl 2018; 57:12702-12706. [PMID: 30118570 PMCID: PMC6169525 DOI: 10.1002/anie.201806197] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 07/30/2018] [Indexed: 02/03/2023]
Abstract
Analogous to reversible post-translational protein modifications, the ability to attach and subsequently remove modifications on proteins would be valuable for protein and biological research. Although bioorthogonal functionalities have been developed to conjugate or cleave protein modifications, they are introduced into proteins on separate residues and often with bulky side chains, limiting their use to one type of control and primarily protein surface. Here we achieved dual control on one residue by genetically encoding S-propargyl-cysteine (SprC), which has bioorthogonal alkyne and propargyl groups in a compact structure, permitting usage in protein interior in addition to surface. We demonstrated its incorporation at the dimer interface of glutathione transferase for in vivo crosslinking via thiol-yne click chemistry, and at the active site of human rhinovirus 3C protease for masking and then turning on enzyme activity via Pd-cleavage of SprC into Cys. In addition, we installed biotin onto EGFP via Sonogashira coupling of SprC and then tracelessly removed it via Pd cleavage. SprC is small in size, commercially available, nontoxic, and allows for bond building and breaking on a single residue. Genetically encoded SprC will be valuable for chemically controlling proteins with an essential Cys and for reversible protein modifications.
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Affiliation(s)
- Jun Liu
- Dr. J. Liu, Dr. H. Wu, S. Li, Prof. W. F. DeGrado, and Prof. L. Wang University of California, San Francisco, Department of Pharmaceutical Chemistry, San Francisco, CA, 94158
| | - Rujin Cheng
- R. Cheng, and Prof. S. Rozovsky.University of Delaware, Department of Chemistry and Biochemistry, Newark, DE, 19716
| | - Haifan Wu
- Dr. J. Liu, Dr. H. Wu, S. Li, Prof. W. F. DeGrado, and Prof. L. Wang University of California, San Francisco, Department of Pharmaceutical Chemistry, San Francisco, CA, 94158
| | - Shanshan Li
- Dr. J. Liu, Dr. H. Wu, S. Li, Prof. W. F. DeGrado, and Prof. L. Wang University of California, San Francisco, Department of Pharmaceutical Chemistry, San Francisco, CA, 94158
- S. Li, Prof. P.G. Wang Department of Chemistry and Center for Therapeutics and Diagnostics, Georgia State University, Atlanta, Georgia 30302
| | - Peng G. Wang
- S. Li, Prof. P.G. Wang Department of Chemistry and Center for Therapeutics and Diagnostics, Georgia State University, Atlanta, Georgia 30302
| | - William F. DeGrado
- Dr. J. Liu, Dr. H. Wu, S. Li, Prof. W. F. DeGrado, and Prof. L. Wang University of California, San Francisco, Department of Pharmaceutical Chemistry, San Francisco, CA, 94158
| | - Sharon Rozovsky
- R. Cheng, and Prof. S. Rozovsky.University of Delaware, Department of Chemistry and Biochemistry, Newark, DE, 19716
| | - Lei Wang
- Dr. J. Liu, Dr. H. Wu, S. Li, Prof. W. F. DeGrado, and Prof. L. Wang University of California, San Francisco, Department of Pharmaceutical Chemistry, San Francisco, CA, 94158
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18
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Liu J, Cheng R, Wu H, Li S, Wang PG, DeGrado WF, Rozovsky S, Wang L. Building and Breaking Bonds via a Compact S‐Propargyl‐Cysteine to Chemically Control Enzymes and Modify Proteins. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201806197] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Jun Liu
- University of California, San Francisco Department of Pharmaceutical Chemistry San Francisco CA 94158 USA
| | - Rujin Cheng
- University of Delaware Department of Chemistry and Biochemistry Newark DE 19716 USA
| | - Haifan Wu
- University of California, San Francisco Department of Pharmaceutical Chemistry San Francisco CA 94158 USA
| | - Shanshan Li
- University of California, San Francisco Department of Pharmaceutical Chemistry San Francisco CA 94158 USA
- Department of Chemistry and Center for Therapeutics and Diagnostics Georgia State University Atlanta GA 30302 USA
| | - Peng G. Wang
- Department of Chemistry and Center for Therapeutics and Diagnostics Georgia State University Atlanta GA 30302 USA
| | - William F. DeGrado
- University of California, San Francisco Department of Pharmaceutical Chemistry San Francisco CA 94158 USA
| | - Sharon Rozovsky
- University of Delaware Department of Chemistry and Biochemistry Newark DE 19716 USA
| | - Lei Wang
- University of California, San Francisco Department of Pharmaceutical Chemistry San Francisco CA 94158 USA
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19
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Affiliation(s)
- Paul D. Riggs
- New England Biolabs, Inc., Research; Ipswich Massachusetts
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20
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Antoniou G, Papakyriacou I, Papaneophytou C. Optimization of Soluble Expression and Purification of Recombinant Human Rhinovirus Type-14 3C Protease Using Statistically Designed Experiments: Isolation and Characterization of the Enzyme. Mol Biotechnol 2017; 59:407-424. [PMID: 28801725 DOI: 10.1007/s12033-017-0032-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Human rhinovirus (HRV) 3C protease is widely used in recombinant protein production for various applications such as biochemical characterization and structural biology projects to separate recombinant fusion proteins from their affinity tags in order to prevent interference between these tags and the target proteins. Herein, we report the optimization of expression and purification conditions of glutathione S-transferase (GST)-tagged HRV 3C protease by statistically designed experiments. Soluble expression of GST-HRV 3C protease was initially optimized by response surface methodology (RSM), and a 5.5-fold increase in enzyme yield was achieved. Subsequently, we developed a new incomplete factorial (IF) design that examines four variables (bacterial strain, expression temperature, induction time, and inducer concentration) in a single experiment. The new design called Incomplete Factorial-Strain/Temperature/Time/Inducer (IF-STTI) was validated using three GST-tagged proteins. In all cases, IF-STTI resulted in only 10% lower expression yields than those obtained by RSM. Purification of GST-HRV 3C was optimized by an IF design that examines simultaneously the effect of the amount of resin, incubation time of cell lysate with resin, and glycerol and DTT concentration in buffers, and a further 15% increase in protease recovery was achieved. Purified GST-HRV 3C protease was active at both 4 and 25 °C in a variety of buffers.
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Affiliation(s)
- Georgia Antoniou
- Department of Life and Health Sciences, School of Sciences and Engineering, University of Nicosia, 46 Makedonitissas Ave., 1700, Nicosia, Cyprus
| | - Irineos Papakyriacou
- Department of Life and Health Sciences, School of Sciences and Engineering, University of Nicosia, 46 Makedonitissas Ave., 1700, Nicosia, Cyprus
| | - Christos Papaneophytou
- Department of Life and Health Sciences, School of Sciences and Engineering, University of Nicosia, 46 Makedonitissas Ave., 1700, Nicosia, Cyprus.
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21
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Shah MA, Ullah R, March MD, Shah MS, Ismat F, Habib M, Iqbal M, Onesti S, Rahman M. Overexpression and characterization of the 100K protein of Fowl adenovirus-4 as an antiviral target. Virus Res 2017; 238:218-225. [PMID: 28666898 DOI: 10.1016/j.virusres.2017.06.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 06/26/2017] [Accepted: 06/27/2017] [Indexed: 10/19/2022]
Abstract
100K is an important scaffolding protein of adenoviruses including fowl adenovirus serotype 4 (FAdV-4) that causes inclusion body hepatitis-hydropericardium syndrome (IBH-HPS) in poultry. 100K carries out the trimerization of the major capsid hexon protein of the virus for the generation of new virions inside the target host cells. Despite its critical role for FAdV-4, no structural study, in particular, has been conducted so far. Here, the overexpression of soluble 100K protein was successfully carried out in E. coli using various expression constructs and purification yield of 3mg per litre culture volume was obtained. Gel filtration chromatography suggested that 100K protein exists in trimeric form. Circular dichroism and Fourier transform infrared spectroscopy clearly reveal that 100K protein folds with a high content of α-helices. The 3-dimentional homology model of the 100K protein, refined with molecular dynamics tools also depicts higher α-helical content within the protein model. Moreover, overexpressed recombinant 100K protein could be used to differentiate vaccinated and FAdV-4 infected chickens on the basis of higher serum anti 100K antibody titres. Our work provides preliminary structural and functional results to study biological role of the 100K protein and for further investigations to develop 100K inhibitors to control IBH-HPS in poultry.
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Affiliation(s)
- Majid Ali Shah
- Drug Discovery and Structural Biology Group, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan; Structural Biology Laboratory, Elettra-Sincrotrone Trieste S.C.p.A., Basovizza 34149, Trieste, Italy; Pakistan Institute of Engineering and Applied Sciences, P.O. Nilore, Islamabad, Pakistan
| | - Raheem Ullah
- Drug Discovery and Structural Biology Group, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan; Structural Biology Laboratory, Elettra-Sincrotrone Trieste S.C.p.A., Basovizza 34149, Trieste, Italy; Pakistan Institute of Engineering and Applied Sciences, P.O. Nilore, Islamabad, Pakistan
| | - Matteo De March
- Structural Biology Laboratory, Elettra-Sincrotrone Trieste S.C.p.A., Basovizza 34149, Trieste, Italy
| | - Muhammad Salahuddin Shah
- Drug Discovery and Structural Biology Group, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan; Vaccine Development Group, Animal Sciences Division, NIAB, Faisalabad, Pakistan
| | - Fouzia Ismat
- Drug Discovery and Structural Biology Group, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan; Pakistan Institute of Engineering and Applied Sciences, P.O. Nilore, Islamabad, Pakistan
| | - Mudasser Habib
- Vaccine Development Group, Animal Sciences Division, NIAB, Faisalabad, Pakistan
| | - Mazhar Iqbal
- Drug Discovery and Structural Biology Group, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan; Pakistan Institute of Engineering and Applied Sciences, P.O. Nilore, Islamabad, Pakistan
| | - Silvia Onesti
- Structural Biology Laboratory, Elettra-Sincrotrone Trieste S.C.p.A., Basovizza 34149, Trieste, Italy
| | - Moazur Rahman
- Drug Discovery and Structural Biology Group, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE), Faisalabad, Pakistan; Pakistan Institute of Engineering and Applied Sciences, P.O. Nilore, Islamabad, Pakistan.
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22
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Zhang Y, Fan Y. A Mutant Sumo Facilitates Quick Plasmid Construction for Expressing Proteins with Native N-termini After Tag Removal. Mol Biotechnol 2017; 59:159-167. [DOI: 10.1007/s12033-017-9998-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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23
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Ullah R, Shah MA, Tufail S, Ismat F, Imran M, Iqbal M, Mirza O, Rahman M. Correction: Activity of the Human Rhinovirus 3C Protease Studied in Various Buffers, Additives and Detergents Solutions for Recombinant Protein Production. PLoS One 2016; 11:e0160128. [PMID: 27442507 PMCID: PMC4956279 DOI: 10.1371/journal.pone.0160128] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
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