151
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Bader M, Stolle T, Jennerwein M, Hauck J, Sahin B, Hofmann T. Chemosensate-Induced Modulation of the Salivary Proteome and Metabolome Alters the Sensory Perception of Salt Taste and Odor-Active Thiols. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:7740-7749. [PMID: 29957939 DOI: 10.1021/acs.jafc.8b02772] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Oral stimulation with chemosensates was found to trigger changes in the composition of the salivary proteome and metabolome, which translate into a functional modulation of odor and taste perception. Orosensory intervention with 6-gingerol induced a significant increase in the abundance of salivary sulfhydryl oxidase 1, which was found to catalyze the oxidative decline of odor-active 2-furfurylthiol, thus resulting in a decrease in the odorant levels in exhaled breath, as shown by PTR-MS, and a reduction of the perceived sulfury after-smell. Therefore, sulfhydryl oxidase 1 may be considered as a component of a molecular network triggering oral cleansing mechanisms after food ingestion. Moreover, oral stimulation with citric acid, followed by targeted metabolomics, was found to induce a strong increase in salivary concentrations of minerals and, in particular, sodium ions, whereas the other metabolites were rather unaffected. Because of the elevated basal levels of salivary sodium after citric acid stimulation, NaCl test stimuli were perceived as significantly less salty, most likely due to the decreased sensory contrast. This indicates the modulation of the salivary proteome and metabolome to be a major perireceptor event in fine-tuning odor and taste sensitivity.
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Affiliation(s)
- Matthias Bader
- Chair for Food Chemistry and Molecular Sensory Science , Technical University of Munich , Lise-Meitner-Straße 34 , D-85354 Freising , Germany
| | - Theresa Stolle
- Chair for Food Chemistry and Molecular Sensory Science , Technical University of Munich , Lise-Meitner-Straße 34 , D-85354 Freising , Germany
| | - Maximilian Jennerwein
- Chair for Food Chemistry and Molecular Sensory Science , Technical University of Munich , Lise-Meitner-Straße 34 , D-85354 Freising , Germany
| | - Jürgen Hauck
- Chair for Food Chemistry and Molecular Sensory Science , Technical University of Munich , Lise-Meitner-Straße 34 , D-85354 Freising , Germany
| | - Buket Sahin
- Leibniz-Institute for Food Systems Biology at the Technical University of Munich , Lise-Meitner Str. 34 , D-85354 Freising , Germany
| | - Thomas Hofmann
- Chair for Food Chemistry and Molecular Sensory Science , Technical University of Munich , Lise-Meitner-Straße 34 , D-85354 Freising , Germany
- Leibniz-Institute for Food Systems Biology at the Technical University of Munich , Lise-Meitner Str. 34 , D-85354 Freising , Germany
- Bavarian Center for Biomolecular Mass Spectrometry , Technical University of Munich , Gregor-Mendel-Straße 4 , 85354 Freising , Germany
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152
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Comparative sequence and structural analysis of Indian orf viruses based on major envelope immuno-dominant protein (F1L), an homologue of pox viral p35/H3 protein. Gene 2018; 663:72-82. [DOI: 10.1016/j.gene.2018.04.026] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 04/07/2018] [Accepted: 04/11/2018] [Indexed: 11/23/2022]
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153
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The role of polyproline motifs in the histidine kinase EnvZ. PLoS One 2018; 13:e0199782. [PMID: 29953503 PMCID: PMC6023141 DOI: 10.1371/journal.pone.0199782] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2018] [Accepted: 06/13/2018] [Indexed: 12/20/2022] Open
Abstract
Although distinct amino acid motifs containing consecutive prolines (polyP) cause ribosome stalling, which necessitates recruitment of the translation elongation factor P (EF-P), they occur strikingly often in bacterial proteomes. For example, polyP motifs are found in more than half of all histidine kinases in Escherichia coli K-12, which raises the question of their role(s) in receptor function. Here we have investigated the roles of two polyP motifs in the osmosensor and histidine kinase EnvZ. We show that the IPPPL motif in the HAMP domain is required for dimerization of EnvZ. Moreover, replacement of the prolines in this motif by alanines disables the receptor’s sensor function. The second motif, VVPPA, which is located in the periplasmic domain, was found to be required for interaction with the modulator protein MzrA. Our study also reveals that polyP-dependent stalling has little effect on EnvZ levels. Hence, both polyP motifs in EnvZ are primarily involved in protein-protein interaction. Furthermore, while the first motif occurs in almost all EnvZ homologues, the second motif is only found in species that have MzrA, indicating co-evolution of the two proteins.
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154
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Bader M, Dunkel A, Wenning M, Kohler B, Medard G, Del Castillo E, Gholami A, Kuster B, Scherer S, Hofmann T. Dynamic Proteome Alteration and Functional Modulation of Human Saliva Induced by Dietary Chemosensory Stimuli. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:5621-5634. [PMID: 29787679 DOI: 10.1021/acs.jafc.8b02092] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Saliva flow measurements and SDS-PAGE separation of human whole saliva freshly collected after oral stimulation with citric acid (sour), aspartame (sweet), iso-α-acids (bitter), mono sodium l-glutamate (umami), NaCl (salty), 6-gingerol (pungent), hydroxy-α-sanshool (tingling), and hydroxy-β-sanshool (numbing), followed by tryptic digestion, nano-HPLC-MS/MS, and label-free protein quantitation demonstrated a stimulus- and time-dependent influence of the dietary chemosensates on salivation and the salivary proteome composition. Gene ontology enrichment analysis showed evidence for stimulus-induced alterations of the saliva proteome to boot an efficient molecular defense network of the oral cavity, e.g., 6-gingerol increased salivary lactoperoxidase activity, catalyzing the oxidation of thiocyanate to produce the antimicrobial and antifungal hypothiocyanate, from 0.37 ± 0.02 to 0.91 ± 0.05 mU/mL 45 s after stimulation. In comparison, oral citric acid stimulation induced an increase of myeloperoxidase activity, catalyzing the chloride oxidation to generate antimicrobial hypochloride in saliva, from 0.24 ± 0.04 to 0.70 ± 0.1 mU/mL as well as an increase of salivary levels of lysozyme, exhibiting antimicrobial activity on Gram-positive bacteria, from 6.0-10 to 100-150 μg/mL. Finally, microbial growth experiments clearly demonstrated for the first time that the increase of the salivary lysozyme abundance upon oral citric acid stimulation translates into an enhanced biological function, that is an almost complete growth inhibition of the two lysozyme-sensitive Gram-positive bacteria tested.
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Affiliation(s)
- Matthias Bader
- Chair of Food Chemistry and Molecular Sensory Science , Technische Universität München , Lise-Meitner Straße 34 , D-85354 Freising , Germany
| | - Andreas Dunkel
- Chair of Food Chemistry and Molecular Sensory Science , Technische Universität München , Lise-Meitner Straße 34 , D-85354 Freising , Germany
| | - Mareike Wenning
- ZIEL Institute for Food and Health , Technische Universität München , D-85350 Freising , Germany
| | - Bernd Kohler
- ZIEL Institute for Food and Health , Technische Universität München , D-85350 Freising , Germany
| | - Guillaume Medard
- Chair of Proteomics and Bioanalytics , Technische Universität München , Emil-Erlenmeyer-Forum 5 , D-85354 Freising , Germany
| | - Estela Del Castillo
- Chair of Proteomics and Bioanalytics , Technische Universität München , Emil-Erlenmeyer-Forum 5 , D-85354 Freising , Germany
| | - Amin Gholami
- Chair of Proteomics and Bioanalytics , Technische Universität München , Emil-Erlenmeyer-Forum 5 , D-85354 Freising , Germany
| | - Bernhard Kuster
- Chair of Proteomics and Bioanalytics , Technische Universität München , Emil-Erlenmeyer-Forum 5 , D-85354 Freising , Germany
| | - Siegfried Scherer
- ZIEL Institute for Food and Health , Technische Universität München , D-85350 Freising , Germany
- Chair of Microbial Ecology, Department of Biosciences, WZW , Technische Universität München , 85354 Freising , Germany
| | - Thomas Hofmann
- Chair of Food Chemistry and Molecular Sensory Science , Technische Universität München , Lise-Meitner Straße 34 , D-85354 Freising , Germany
- ZIEL Institute for Food and Health , Technische Universität München , D-85350 Freising , Germany
- Leibniz-Institute for Food Systems Biology , Technical University of Munich , Lise-Meitner Straße 34 , D-85354 Freising , Germany
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155
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Pietrocola G, Arciola CR, Rindi S, Montanaro L, Speziale P. Streptococcus agalactiae Non-Pilus, Cell Wall-Anchored Proteins: Involvement in Colonization and Pathogenesis and Potential as Vaccine Candidates. Front Immunol 2018; 9:602. [PMID: 29686667 PMCID: PMC5900788 DOI: 10.3389/fimmu.2018.00602] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 03/09/2018] [Indexed: 11/13/2022] Open
Abstract
Group B Streptococcus (GBS) remains an important etiological agent of several infectious diseases including neonatal septicemia, pneumonia, meningitis, and orthopedic device infections. This pathogenicity is due to a variety of virulence factors expressed by Streptococcus agalactiae. Single virulence factors are not sufficient to provoke a streptococcal infection, which is instead promoted by the coordinated activity of several pathogenicity factors. Such determinants, mostly cell wall-associated and secreted proteins, include adhesins that mediate binding of the pathogen to host extracellular matrix/plasma ligands and cell surfaces, proteins that cooperate in the invasion of and survival within host cells and factors that neutralize phagocytosis and/or modulate the immune response. The genome-based approaches and bioinformatics tools and the extensive use of biophysical and biochemical methods and animal model studies have provided a great wealth of information on the molecular structure and function of these virulence factors. In fact, a number of new GBS surface-exposed or secreted proteins have been identified (GBS immunogenic bacterial adhesion protein, leucine-rich repeat of GBS, serine-rich repeat proteins), the three-dimensional structures of known streptococcal proteins (αC protein, C5a peptidase) have been solved and an understanding of the pathogenetic role of "old" and new determinants has been better defined in recent years. Herein, we provide an update of our current understanding of the major surface cell wall-anchored proteins from GBS, with emphasis on their biochemical and structural properties and the pathogenetic roles they may have in the onset and progression of host infection. We also focus on the antigenic profile of these compounds and discuss them as targets for therapeutic intervention.
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Affiliation(s)
- Giampiero Pietrocola
- Unit of Biochemistry, Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Carla Renata Arciola
- Research Unit on Implant Infections, Rizzoli Orthopaedic Institute, Bologna, Italy.,Department of Experimental, Diagnostic, and Specialty Medicine, University of Bologna, Bologna, Italy
| | - Simonetta Rindi
- Unit of Biochemistry, Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Lucio Montanaro
- Research Unit on Implant Infections, Rizzoli Orthopaedic Institute, Bologna, Italy.,Department of Experimental, Diagnostic, and Specialty Medicine, University of Bologna, Bologna, Italy
| | - Pietro Speziale
- Unit of Biochemistry, Department of Molecular Medicine, University of Pavia, Pavia, Italy.,Department of Industrial and Information Engineering, University of Pavia, Pavia, Italy
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156
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Independent control of matrix adhesiveness and stiffness within a 3D self-assembling peptide hydrogel. Acta Biomater 2018; 70:110-119. [PMID: 29410241 DOI: 10.1016/j.actbio.2018.01.031] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Revised: 01/15/2018] [Accepted: 01/24/2018] [Indexed: 12/30/2022]
Abstract
A cell's insoluble microenvironment has increasingly been shown to exert influence on its function. In particular, matrix stiffness and adhesiveness strongly impact behaviors such as cell spreading and differentiation, but materials that allow for independent control of these parameters within a fibrous, stromal-like microenvironment are very limited. In the current work, we devise a self-assembling peptide (SAP) system that facilitates user-friendly control of matrix stiffness and RGD (Arg-Gly-Asp) concentration within a hydrogel possessing a microarchitecture similar to stromal extracellular matrix. In this system, the RGD-modified SAP sequence KFE-RGD and the scrambled sequence KFE-RDG can be directly swapped for one another to change RGD concentration at a given matrix stiffness and total peptide concentration. Stiffness is controlled by altering total peptide concentration, and the unmodified base peptide KFE-8 can be included to further increase this stiffness range due to its higher modulus. With this tunable system, we demonstrate that human mesenchymal stem cell morphology and differentiation are influenced by both gel stiffness and the presence of functional cell binding sites in 3D culture. Specifically, cells 24 hours after encapsulation were only able to spread out in stiffer matrices containing KFE-RGD. Upon addition of soluble adipogenic factors, soft gels facilitated the greatest adipogenesis as determined by the presence of lipid vacuoles and PPARγ-2 expression, while increasing KFE-RGD concentration at a given stiffness had a negative effect on adipogenesis. This three-component hydrogel system thus allows for systematic investigation of matrix stiffness and RGD concentration on cell behavior within a fibrous, three-dimensional matrix. STATEMENT OF SIGNIFICANCE Physical cues from a cell's surrounding environment-such as the density of cell binding sites and the stiffness of the surrounding material-are increasingly being recognized as key regulators of cell function. Currently, most synthetic biomaterials used to independently tune these parameters lack the fibrous structure characteristic of stromal extracellular matrix, which can be important to cells naturally residing within stromal tissues. In this manuscript, we describe a 3D hydrogel encapsulation system that provides user-friendly control over matrix stiffness and binding site concentration within the context of a stromal-like microarchitecture. Binding site concentration and gel stiffness both influenced cell spreading and differentiation, highlighting the utility of this system to study the independent effects of these material properties on cell function.
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157
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The PT/S-Box of Modular Cellulase AcCel12B Plays a Key Role in the Hydrolysis of Insoluble Cellulose. Catalysts 2018. [DOI: 10.3390/catal8030123] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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158
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Carver JA, Ecroyd H, Truscott RJW, Thorn DC, Holt C. Proteostasis and the Regulation of Intra- and Extracellular Protein Aggregation by ATP-Independent Molecular Chaperones: Lens α-Crystallins and Milk Caseins. Acc Chem Res 2018; 51:745-752. [PMID: 29442498 DOI: 10.1021/acs.accounts.7b00250] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Molecular chaperone proteins perform a diversity of roles inside and outside the cell. One of the most important is the stabilization of misfolding proteins to prevent their aggregation, a process that is potentially detrimental to cell viability. Diseases such as Alzheimer's, Parkinson's, and cataract are characterized by the accumulation of protein aggregates. In vivo, many proteins are metastable and therefore under mild destabilizing conditions have an inherent tendency to misfold, aggregate, and hence lose functionality. As a result, protein levels are tightly regulated inside and outside the cell. Protein homeostasis, or proteostasis, describes the network of biological pathways that ensures the proteome remains folded and functional. Proteostasis is a major factor in maintaining cell, tissue, and organismal viability. We have extensively investigated the structure and function of intra- and extracellular molecular chaperones that operate in an ATP-independent manner to stabilize proteins and prevent their misfolding and subsequent aggregation into amorphous particles or highly ordered amyloid fibrils. These types of chaperones are therefore crucial in maintaining proteostasis under normal and stress (e.g., elevated temperature) conditions. Despite their lack of sequence similarity, they exhibit many common features, i.e., extensive structural disorder, dynamism, malleability, heterogeneity, oligomerization, and similar mechanisms of chaperone action. In this Account, we concentrate on the chaperone roles of α-crystallins and caseins, the predominant proteins in the eye lens and milk, respectively. Intracellularly, the principal ATP-independent chaperones are the small heat-shock proteins (sHsps). In vivo, sHsps are the first line of defense in preventing intracellular protein aggregation. The lens proteins αA- and αB-crystallin are sHsps. They play a crucial role in maintaining solubility of the crystallins (including themselves) with age and hence in lens proteostasis and, ultimately, lens transparency. As there is little metabolic activity and no protein turnover in the lens, crystallins are very long lived proteins. Lens proteostasis is therefore very different to that in normal, metabolically active cells. Crystallins undergo extensive post-translational modification (PTM), including deamidation, racemization, phosphorylation, and truncation, which can alter their stability. Despite this, the lens remains transparent for tens of years, implying that lens proteostasis is intimately integrated with crystallin PTMs. Many PTMs do not significantly alter crystallin stability, solubility, and functionality, which thereby facilitates lens transparency. In the long term, however, extensive accumulation of crystallin PTMs leads to large-scale crystallin aggregation, lens opacification, and cataract formation. Extracellularly, various ATP-independent molecular chaperones exist that exhibit sHsp-like structural and functional features. For example, caseins, the major milk proteins, exhibit chaperone ability by inhibiting the amorphous and amyloid fibrillar aggregation of a diversity of destabilized proteins. Caseins maintain proteostasis within milk by preventing deleterious casein amyloid fibril formation via incorporation of thousands of individual caseins into an amorphous structure known as the casein micelle. Hundreds of nanoclusters of calcium phosphate are sequestered within each casein micelle through interactions with short, highly phosphorylated casein sequences. This results in a stable biofluid that contains a high concentration of potentially amyloidogenic caseins and concentrations of calcium and phosphate that can be far in excess of the solubility of calcium phosphate. Casein micelle formation therefore performs vital roles in neonatal nutrition and calcium homeostasis in the mammary gland.
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Affiliation(s)
- John A. Carver
- Research School of Chemistry, The Australian National University, Acton, ACT 2601, Australia
| | - Heath Ecroyd
- Illawarra Health and Medical Research Institute and School of Biological Sciences, University of Wollongong, Wollongong, NSW 2522, Australia
| | - Roger J. W. Truscott
- Illawarra Health and Medical Research Institute and School of Biological Sciences, University of Wollongong, Wollongong, NSW 2522, Australia
| | - David C. Thorn
- Research School of Chemistry, The Australian National University, Acton, ACT 2601, Australia
| | - Carl Holt
- Institute of Molecular, Cell and Systems Biology, University of Glasgow, Glasgow G12 8QQ, United Kingdom
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159
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Ekizoglu S, Ulutin T, Guliyev J, Buyru N. PRR4: A novel downregulated gene in laryngeal cancer. Oncol Lett 2018. [PMID: 29541239 DOI: 10.3892/ol.2018.7888] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Head and neck squamous cell carcinomas (HNSCC) are a diverse group of tumor types, including neoplasia of the paranasal sinuses, oral cavity, trachea, pharynx and larynx. Laryngeal cancer is the most common type of HNSCC. The proline-rich 4 (PRR4) protein is synthesized in the acinar cells of human lacrimal glands. Previous studies have demonstrated that PRR4 may function as an antimicrobial protein protecting the ocular surface and the oral cavity. In order to determine differentially expressed genes (DEGs) in laryngeal tumors, a GeneFishing Assay was performed; 27 DEGs were identified. The PRR4 gene expression level in laryngeal tissue samples obtained from 90 patients, and the saliva of 25 healthy smokers and 25 non-smokers, was investigated using reverse transcription-quantitative polymerase chain reaction. It was revealed that PRR4 gene expression was decreased in 65/90 tumor tissues (72.2%) compared with normal tissues. No significant difference was identified between the healthy smoker and the non-smoker groups in terms of PRR4 gene expression. The results of the present study indicated that the PRR4 gene may serve an important role in laryngeal carcinogenesis.
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Affiliation(s)
- Seda Ekizoglu
- Department of Medical Biology, Cerrahpasa Medical Faculty, Istanbul University, Istanbul 34098, Turkey
| | - Turgut Ulutin
- Department of Medical Biology, Cerrahpasa Medical Faculty, Istanbul University, Istanbul 34098, Turkey
| | - Jalal Guliyev
- Department of Otorhinolaryngology, Cerrahpasa Medical Faculty, Istanbul University, Istanbul 34098, Turkey
| | - Nur Buyru
- Department of Medical Biology, Cerrahpasa Medical Faculty, Istanbul University, Istanbul 34098, Turkey
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160
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Shahin R, Iwanaga M, Kawasaki H. Expression profiles of cuticular protein genes in wing tissues during pupal to adult stages and the deduced adult cuticular structure of Bombyx mori. Gene 2018; 646:181-194. [DOI: 10.1016/j.gene.2017.11.076] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 11/06/2017] [Accepted: 11/30/2017] [Indexed: 01/09/2023]
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161
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162
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Wong LE, Maier J, Wienands J, Becker S, Griesinger C. Sensitivity-Enhanced Four-Dimensional Amide–Amide Correlation NMR Experiments for Sequential Assignment of Proline-Rich Disordered Proteins. J Am Chem Soc 2018; 140:3518-3522. [DOI: 10.1021/jacs.8b00215] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Leo E. Wong
- Department for NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, 37077 Göttingen, Germany
| | - Joachim Maier
- Department for NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, 37077 Göttingen, Germany
| | - Jürgen Wienands
- Institute of Cellular and Molecular Immunology, Georg August University of Göttingen, Humboldtallee 34, 37073 Göttingen, Germany
| | - Stefan Becker
- Department for NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, 37077 Göttingen, Germany
| | - Christian Griesinger
- Department for NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, 37077 Göttingen, Germany
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163
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Thadani NN, Dempsey C, Zhao J, Vasquez SM, Suh J. Reprogramming the Activatable Peptide Display Function of Adeno-Associated Virus Nanoparticles. ACS NANO 2018; 12:1445-1454. [PMID: 29278489 DOI: 10.1021/acsnano.7b07804] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We harnessed an intrinsic activatable peptide display behavior shared by several parvoviruses, including the adeno-associated virus (AAV), in order to design protein-based nanodevices that can carry out an exogenous functional output in response to stimulus detection. Specifically, we generated truncated viral capsid subunits that, when combined with native capsid components into mosaic capsids, can perform robust activatable peptide display. By modulating the ratio of subunits in the mosaic capsid, properties of the activatable peptide display function can be optimized. Interestingly, the truncated subunits can form homomeric capsids not observed in nature, but at the price of losing the ability to carry out activatable peptide display. Collectively, our results demonstrate the importance of capsid mosaicism when activatable peptide display is desired and help explain why the wild-type AAV capsid exists as a mosaic of different subunits. This proof-of-concept study illustrates a strategy for reprogramming a particular conformational output behavior of AAV in pursuit of the long-term vision of creating stimulus-responsive nanodevices.
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Affiliation(s)
- Nicole N Thadani
- Department of Bioengineering, Rice University , Houston, Texas 77005, United States
| | - Christopher Dempsey
- Department of Bioengineering, Rice University , Houston, Texas 77005, United States
| | - Julia Zhao
- Department of Bioengineering, Rice University , Houston, Texas 77005, United States
| | - Sonya M Vasquez
- Department of Bioengineering, Rice University , Houston, Texas 77005, United States
| | - Junghae Suh
- Department of Bioengineering, Rice University , Houston, Texas 77005, United States
- Systems, Synthetic and Physical Biology, Rice University , Houston, Texas 77005, United States
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164
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Chao A, Chang TC, Lapke N, Jung SM, Chi P, Chen CH, Yang LY, Lin CT, Huang HJ, Chou HH, Liou JD, Chen SJ, Wang TH, Lai CH. Prevalence and clinical significance of BRCA1/2 germline and somatic mutations in Taiwanese patients with ovarian cancer. Oncotarget 2018; 7:85529-85541. [PMID: 27907908 PMCID: PMC5356755 DOI: 10.18632/oncotarget.13456] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2016] [Accepted: 10/28/2016] [Indexed: 12/27/2022] Open
Abstract
Germline and somatic BRCA1/2 mutations define a subset of patients with ovarian cancer who may benefit from treatment with poly (ADP-ribose) polymerase inhibitors. Unfortunately, data on the frequency of BRCA1/2 germline mutations in Taiwanese patients with ovarian cancer are scarce, with the prevalence of somatic mutations being unknown. We aim to investigate the occurrence of BRCA1/2 mutations in 99 Taiwanese patients with ovarian cancer which included serous (n = 46), endometrioid (n = 24), and clear cell (n = 29) carcinomas. BRCA1/2 mutations were identified using next-generation sequencing of formalin-fixed paraffin-embedded tumor samples. Pathogenic variants (BRCA1: n = 7; BRCA2: n = 6) were detected in 12.1% (12/99) of the study patients. Somatic and germline BRCA1/2 mutation rates in serous ovarian cancer are 4/46 (8.7%) and 8/46 (17%), respectively. All of the pathogenic BRCA1/2 mutations were identified in serous carcinoma samples (12/46; 26.1%). One-third (4/12) of the deleterious BRCA1/2 mutations occurred in tumor tissues only (somatic mutations). All of them coexisted with loss of heterozygosity, resulting in biallelic BRCA inactivation. Five novel pathogenic mutations were identified, including four somatic variants (BRCA1 p.S242fs, BRCA1 p.F989fs, BRCA1 p.G1738fs, and BRCA2 p.D1451fs) and a germline variant (BRCA2 p.E260fs). We also detected additional six novel mutations (three in BRCA1 and three in BRCA2) with pathogenic potentials. We conclude that BRCA1/2 mutations are common in Taiwanese patients with serous ovarian carcinoma and similar to mutation rates in other ethnic groups. The analysis of BRCA1/2 somatic mutations is crucial for guiding therapeutic decisions in ovarian cancer.
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Affiliation(s)
- Angel Chao
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan.,Gynecologic Cancer Research Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Ting-Chang Chang
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan.,Gynecologic Cancer Research Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | | | - Shih-Ming Jung
- Department of Pathology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan
| | - Peter Chi
- Institute of Biochemical Sciences, College of Life Science, National Taiwan University, Taiwan
| | | | - Lan-Yan Yang
- Clinical Trial Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Cheng-Tao Lin
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan.,Gynecologic Cancer Research Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Huei-Jean Huang
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan.,Gynecologic Cancer Research Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Hung-Hsueh Chou
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan.,Gynecologic Cancer Research Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Jui-Der Liou
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan.,Gynecologic Cancer Research Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | | | - Tzu-Hao Wang
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan.,Gynecologic Cancer Research Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan.,School of Traditional Chinese Medicine, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Chyong-Huey Lai
- Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Linkou Medical Center, Taoyuan, Taiwan.,Gynecologic Cancer Research Center, Chang Gung Memorial Hospital, Taoyuan, Taiwan
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165
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Voronina L, Scutelnic V, Masellis C, Rizzo TR. Can Mutational Analysis Be Used To Assist Structure Determination of Peptides? J Am Chem Soc 2018; 140:2401-2404. [PMID: 29412650 DOI: 10.1021/jacs.7b11302] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Mutational analysis is widely used to study the relationship between sequence and structure of proteins and peptides. It is often assumed that substituting a proline with another amino acid "locks" the peptide bond in the trans conformation, allowing only a subset of the initial molecular geometries to be observed. To test this assumption, we assess the result of substituting two prolines in the bradykinin sequence with alanine using field-asymmetric ion mobility spectrometry combined with cryogenic ion spectroscopy in the gas phase. While the structure of the mutant coincides with a part of the conformational space of the original peptide, the higher flexibility of the alanine backbone compared to proline allows it to access additional structures. We conclude that proline-to-nonproline substitutions are helpful to assign structures, but they should be used in conjunction with spectroscopic techniques that allow detailed comparison of the structures of the mutant and the native peptide.
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Affiliation(s)
- Liudmila Voronina
- Laboratoire de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCPM , Station 6, CH-1015 Lausanne, Switzerland
| | - Valeriu Scutelnic
- Laboratoire de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCPM , Station 6, CH-1015 Lausanne, Switzerland
| | - Chiara Masellis
- Laboratoire de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCPM , Station 6, CH-1015 Lausanne, Switzerland
| | - Thomas R Rizzo
- Laboratoire de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCPM , Station 6, CH-1015 Lausanne, Switzerland
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166
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Brüne D, Andrade-Navarro MA, Mier P. Proteome-wide comparison between the amino acid composition of domains and linkers. BMC Res Notes 2018; 11:117. [PMID: 29426365 PMCID: PMC5807739 DOI: 10.1186/s13104-018-3221-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Accepted: 02/01/2018] [Indexed: 02/01/2023] Open
Abstract
Objective Amino acid composition is a sequence feature that has been extensively used to characterize proteomes of many species and protein families. Yet the analysis of amino acid composition of protein domains and the linkers connecting them has received less attention. Here, we perform both a comprehensive full-proteome amino acid composition analysis and a similar analysis focusing on domains and linkers, to uncover domain- or linker-specific differential amino acid usage patterns. Results The amino acid composition in the 38 proteomes studied showcase the greater variability found in archaea and bacteria species compared to eukaryotes. When focusing on domains and linkers, we describe the preferential use of polar residues in linkers and hydrophobic residues in domains. To let any user perform this analysis on a given domain (or set of them), we developed a dedicated R script called RACCOON, which can be easily used and can provide interesting insights into the compositional differences between a domain and its surrounding linkers. Electronic supplementary material The online version of this article (10.1186/s13104-018-3221-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Daniel Brüne
- Institute of Pharmacy and Molecular Biotechnology, Ruprecht Karls University Heidelberg, 69120, Heidelberg, Germany
| | | | - Pablo Mier
- Faculty of Biology, Johannes Gutenberg University Mainz, Gresemundweg 2, 55128, Mainz, Germany.
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167
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Arnold U, Raines RT. Replacing a single atom accelerates the folding of a protein and increases its thermostability. Org Biomol Chem 2018; 14:6780-5. [PMID: 27336677 DOI: 10.1039/c6ob00980h] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The conformational attributes of proline can have a substantial effect on the folding of polypeptide chains into a native structure and on the stability of that structure. Replacing the 4S hydrogen of a proline residue with fluorine is known to elicit stereoelectronic effects that favor a cis peptide bond. Here, semisynthesis is used to replace a cis-proline residue in ribonuclease A with (2S,4S)-4-fluoroproline. This subtle substitution accelerates the folding of the polypeptide chain into its three-dimensional structure and increases the thermostability of that structure without compromising its catalytic activity. Thus, an appropriately situated fluorine can serve as a prosthetic atom in the context of a protein.
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Affiliation(s)
- Ulrich Arnold
- Institute of Biochemistry and Biotechnology, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany
| | - Ronald T Raines
- Department of Biochemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA. and Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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168
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Yang JI, Lee YC, Siebert KJ. Study of Colloidal Instability of Millet Wine. JOURNAL OF THE AMERICAN SOCIETY OF BREWING CHEMISTS 2018. [DOI: 10.1094/asbcj-64-0086] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Jing-Iong Yang
- Laboratory of Food Processing and Analysis, Department of Seafood Science, National Kaohsiung Marine University, 142, Hai-Chuan Rd., Nan-Tzu, Kaohsiung, Taiwan 81105
| | - Yeun-Chung Lee
- Food and Biochemical Process Engineering Laboratory, Department of Bio-Industrial Mechatronics Engineering, College of Bio-Resources and Agriculture, National Taiwan University, Taipei, Taiwan 10617
| | - Karl J. Siebert
- Food Science and Technology Department, Cornell University, Geneva, NY 14456
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169
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Yang JI, Siebert KJ. Development of a Method for Assessing Haze-Active Protein in Beer by Dye Binding. JOURNAL OF THE AMERICAN SOCIETY OF BREWING CHEMISTS 2018. [DOI: 10.1094/asbcj-59-0172] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Jing-Iong Yang
- Dept. of Food Science and Technology, Cornell University, Geneva, NY 14456
| | - Karl J. Siebert
- Dept. of Food Science and Technology, Cornell University, Geneva, NY 14456
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170
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Rashidinejad A, Birch EJ, Sun-Waterhouse D, Everett DW. Addition of milk to tea infusions: Helpful or harmful? Evidence from in vitro and in vivo studies on antioxidant properties. Crit Rev Food Sci Nutr 2018; 57:3188-3196. [PMID: 26517348 DOI: 10.1080/10408398.2015.1099515] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Tea consumption is practised as a tradition, and has shown potential to improve human health. Maximal uptake of tea antioxidants and milk proteins without a negative impact on tea flavor is highly desired by consumers. There is a conflicting evidence of the effect of milk addition to tea on antioxidant activity. Differences in the type of tea, the composition, type and amount of milk, preparation method of tea-milk infusions, the assays used to measure antioxidant activity, and sampling size likely account for different findings. Interactions between tea polyphenols and milk proteins, especially between catechins and caseins, could account for a decrease in antioxidant activity, although other mechanisms are also possible, given the similar effects between soy and bovine milk. The role of milk fat globules and the milk fat globule membrane surface is also important when considering interactions and loss of polyphenolic antioxidant activity, which has not been addressed in the literature.
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Affiliation(s)
- Ali Rashidinejad
- a Department of Food Science , University of Otago , Dunedin , New Zealand.,b Riddet Institute , Palmerston North , New Zealand
| | - E John Birch
- a Department of Food Science , University of Otago , Dunedin , New Zealand
| | | | - David W Everett
- a Department of Food Science , University of Otago , Dunedin , New Zealand.,b Riddet Institute , Palmerston North , New Zealand
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171
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Ochalek A, Mihalik B, Avci HX, Chandrasekaran A, Téglási A, Bock I, Giudice ML, Táncos Z, Molnár K, László L, Nielsen JE, Holst B, Freude K, Hyttel P, Kobolák J, Dinnyés A. Neurons derived from sporadic Alzheimer's disease iPSCs reveal elevated TAU hyperphosphorylation, increased amyloid levels, and GSK3B activation. ALZHEIMERS RESEARCH & THERAPY 2017; 9:90. [PMID: 29191219 PMCID: PMC5709977 DOI: 10.1186/s13195-017-0317-z] [Citation(s) in RCA: 140] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Accepted: 10/27/2017] [Indexed: 12/16/2022]
Abstract
BACKGROUND Alzheimer's disease (AD) is the most common type of dementia, affecting one in eight adults over 65 years of age. The majority of AD cases are sporadic, with unknown etiology, and only 5% of all patients with AD present the familial monogenic form of the disease. In the present study, our aim was to establish an in vitro cell model based on patient-specific human neurons to study the pathomechanism of sporadic AD. METHODS We compared neurons derived from induced pluripotent stem cell (iPSC) lines of patients with early-onset familial Alzheimer's disease (fAD), all caused by mutations in the PSEN1 gene; patients with late-onset sporadic Alzheimer's disease (sAD); and three control individuals without dementia. The iPSC lines were differentiated toward mature cortical neurons, and AD pathological hallmarks were analyzed by RT-qPCR, enzyme-linked immunosorbent assay, and Western blotting methods. RESULTS Neurons from patients with fAD and patients with sAD showed increased phosphorylation of TAU protein at all investigated phosphorylation sites. Relative to the control neurons, neurons derived from patients with fAD and patients with sAD exhibited higher levels of extracellular amyloid-β 1-40 (Aβ1-40) and amyloid-β 1-42 (Aβ1-42). However, significantly increased Aβ1-42/Aβ1-40 ratios, which is one of the pathological markers of fAD, were observed only in samples of patients with fAD. Additionally, we detected increased levels of active glycogen synthase kinase 3 β, a physiological kinase of TAU, in neurons derived from AD iPSCs, as well as significant upregulation of amyloid precursor protein (APP) synthesis and APP carboxy-terminal fragment cleavage. Moreover, elevated sensitivity to oxidative stress, as induced by amyloid oligomers or peroxide, was detected in both fAD- and sAD-derived neurons. CONCLUSIONS On the basis of the experiments we performed, we can conclude there is no evident difference except secreted Aβ1-40 levels in phenotype between fAD and sAD samples. To our knowledge, this is the first study in which the hyperphosphorylation of TAU protein has been compared in fAD and sAD iPSC-derived neurons. Our findings demonstrate that iPSC technology is suitable to model both fAD and sAD and may provide a platform for developing new treatment strategies for these conditions.
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Affiliation(s)
- Anna Ochalek
- Molecular Animal Biotechnology Laboratory, Szent István University, H-2100, Gödöllő, Hungary.,BioTalentum Ltd., Aulich Lajos Street 26, H-2100, Gödöllő, Hungary
| | - Balázs Mihalik
- BioTalentum Ltd., Aulich Lajos Street 26, H-2100, Gödöllő, Hungary
| | - Hasan X Avci
- BioTalentum Ltd., Aulich Lajos Street 26, H-2100, Gödöllő, Hungary.,Department of Anatomy, Embryology and Histology, Faculty of Medicine, University of Szeged, H-6700, Szeged, Hungary.,Present address: University Department of Otolaryngology, Head and Neck Surgery, University of Tübingen, 72076, Tübingen, Germany
| | | | | | - István Bock
- BioTalentum Ltd., Aulich Lajos Street 26, H-2100, Gödöllő, Hungary
| | - Maria Lo Giudice
- BioTalentum Ltd., Aulich Lajos Street 26, H-2100, Gödöllő, Hungary
| | - Zsuzsanna Táncos
- BioTalentum Ltd., Aulich Lajos Street 26, H-2100, Gödöllő, Hungary
| | - Kinga Molnár
- Department of Anatomy, Cell and Developmental Biology, Eötvös Loránd University, H-1117, Budapest, Hungary
| | - Lajos László
- Department of Anatomy, Cell and Developmental Biology, Eötvös Loránd University, H-1117, Budapest, Hungary
| | - Jørgen E Nielsen
- Neurogenetics Clinic & Research Laboratory, Danish Dementia Research Centre, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | | | - Kristine Freude
- Department of Veterinary and Animal Sciences, University of Copenhagen, 1870, Copenhagen, Denmark
| | - Poul Hyttel
- Department of Veterinary and Animal Sciences, University of Copenhagen, 1870, Copenhagen, Denmark
| | - Julianna Kobolák
- BioTalentum Ltd., Aulich Lajos Street 26, H-2100, Gödöllő, Hungary
| | - András Dinnyés
- Molecular Animal Biotechnology Laboratory, Szent István University, H-2100, Gödöllő, Hungary. .,BioTalentum Ltd., Aulich Lajos Street 26, H-2100, Gödöllő, Hungary.
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172
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Khare H, Dey D, Madhu C, Senapati D, Raghothama S, Govindaraju T, Ramakumar S. Conformational heterogeneity in tails of DNA-binding proteins is augmented by proline containing repeats. MOLECULAR BIOSYSTEMS 2017; 13:2531-2544. [PMID: 29104984 DOI: 10.1039/c7mb00412e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A cationic terminal extension or tail is a common feature of many DNA-binding proteins. We show that a particular type of tail rich in proline, alanine and lysine belongs to the class of 'flexible disorder' and consists of characteristic pentapeptide repeats. Our designed peptides, (AAKKA)1-4 and (PAKKA)1-4, represent the tails of several bacterial DNA-binding proteins. Enhanced conformational sampling of these representative peptides using accelerated molecular dynamic simulations supported by circular dichroism spectroscopy and nuclear magnetic resonance studies demonstrates the role of frequent and interspersed prolines in augmenting conformational heterogeneity of the peptide backbone. Analysis of circular variance of backbone dihedral angles indicates alternating regions of relative rigidity and flexibility along the peptide sequence due to prolines. Preferred placement of lysines in the regions of higher backbone flexibility might improve DNA-binding by conformational selection. Our results could be relevant for rational de novo design of disordered peptides.
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Affiliation(s)
- Harshavardhan Khare
- Department of Physics, Indian Institute of Science, Bengaluru 560012, India.
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173
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Abstract
Microbial pathogens commonly escape the human immune system by varying surface proteins. We investigated the mechanisms used for that purpose by Pneumocystis jirovecii This uncultivable fungus is an obligate pulmonary pathogen that in immunocompromised individuals causes pneumonia, a major life-threatening infection. Long-read PacBio sequencing was used to assemble a core of subtelomeres of a single P. jirovecii strain from a bronchoalveolar lavage fluid specimen from a single patient. A total of 113 genes encoding surface proteins were identified, including 28 pseudogenes. These genes formed a subtelomeric gene superfamily, which included five families encoding adhesive glycosylphosphatidylinositol (GPI)-anchored glycoproteins and one family encoding excreted glycoproteins. Numerical analyses suggested that diversification of the glycoproteins relies on mosaic genes created by ectopic recombination and occurs only within each family. DNA motifs suggested that all genes are expressed independently, except those of the family encoding the most abundant surface glycoproteins, which are subject to mutually exclusive expression. PCR analyses showed that exchange of the expressed gene of the latter family occurs frequently, possibly favored by the location of the genes proximal to the telomere because this allows concomitant telomere exchange. Our observations suggest that (i) the P. jirovecii cell surface is made of a complex mixture of different surface proteins, with a majority of a single isoform of the most abundant glycoprotein, (ii) genetic mosaicism within each family ensures variation of the glycoproteins, and (iii) the strategy of the fungus consists of the continuous production of new subpopulations composed of cells that are antigenically different.IMPORTANCEPneumocystis jirovecii is a fungus causing severe pneumonia in immunocompromised individuals. It is the second most frequent life-threatening invasive fungal infection. We have studied the mechanisms of antigenic variation used by this pathogen to escape the human immune system, a strategy commonly used by pathogenic microorganisms. Using a new DNA sequencing technology generating long reads, we could characterize the highly repetitive gene families encoding the proteins that are present on the cellular surface of this pest. These gene families are localized in the regions close to the ends of all chromosomes, the subtelomeres. Such chromosomal localization was found to favor genetic recombinations between members of each gene family and to allow diversification of these proteins continuously over time. This pathogen seems to use a strategy of antigenic variation consisting of the continuous production of new subpopulations composed of cells that are antigenically different. Such a strategy is unique among human pathogens.
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174
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Hagemann A, Müller G, Manthey I, Bachmann HS. Exploring the putative self-binding property of the human farnesyltransferase alpha-subunit. FEBS Lett 2017; 591:3637-3648. [PMID: 28948621 DOI: 10.1002/1873-3468.12862] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Revised: 09/12/2017] [Accepted: 09/22/2017] [Indexed: 01/08/2023]
Abstract
Farnesylation is an important post-translational protein modification in eukaryotes. Farnesylation is performed by protein farnesyltransferase, a heterodimer composed of an α- (FTα) and a β-subunit. Recently, homodimerization of truncated rat and yeast FTα has been detected, suggesting a new role for FTα homodimers in signal transduction. We investigated the putative dimerization behaviour of human and rat FTα. Different in vitro and in vivo approaches revealed no self-dimerization and a presumably artificial formation of homotrimers and higher homo-oligomers in vitro. Our study contributes to the clarification of the physiological features of FTase in different species and may be important for the ongoing development of FTase inhibitors.
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Affiliation(s)
- Anna Hagemann
- Institute of Pharmacogenetics, University Hospital Essen, University of Duisburg-Essen, Germany
| | - Grit Müller
- Institute of Pharmacogenetics, University Hospital Essen, University of Duisburg-Essen, Germany
| | - Iris Manthey
- Institute of Pharmacogenetics, University Hospital Essen, University of Duisburg-Essen, Germany
| | - Hagen S Bachmann
- Institute of Pharmacogenetics, University Hospital Essen, University of Duisburg-Essen, Germany.,Institute of Pharmacology and Toxicology, School of Medicine, Faculty of Health, Witten/Herdecke University, Germany
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175
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Siddiqui N, Straube A. Intracellular Cargo Transport by Kinesin-3 Motors. BIOCHEMISTRY (MOSCOW) 2017; 82:803-815. [PMID: 28918744 DOI: 10.1134/s0006297917070057] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Intracellular transport along microtubules enables cellular cargoes to efficiently reach the extremities of large, eukaryotic cells. While it would take more than 200 years for a small vesicle to diffuse from the cell body to the growing tip of a one-meter long axon, transport by a kinesin allows delivery in one week. It is clear from this example that the evolution of intracellular transport was tightly linked to the development of complex and macroscopic life forms. The human genome encodes 45 kinesins, 8 of those belonging to the family of kinesin-3 organelle transporters that are known to transport a variety of cargoes towards the plus end of microtubules. However, their mode of action, their tertiary structure, and regulation are controversial. In this review, we summarize the latest developments in our understanding of these fascinating molecular motors.
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Affiliation(s)
- N Siddiqui
- Centre for Mechanochemical Cell Biology, University of Warwick, Coventry, CV4 7AL, UK.
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176
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Yildirim-Elikoglu S, Erdem YK. Interactions between milk proteins and polyphenols: Binding mechanisms, related changes, and the future trends in the dairy industry. FOOD REVIEWS INTERNATIONAL 2017. [DOI: 10.1080/87559129.2017.1377225] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Seda Yildirim-Elikoglu
- Department of Food Engineering, Faculty of Engineering, Hacettepe University, Ankara, Turkey
| | - Yasar Kemal Erdem
- Department of Food Engineering, Faculty of Engineering, Hacettepe University, Ankara, Turkey
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177
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Baudier J. ATAD3 proteins: brokers of a mitochondria-endoplasmic reticulum connection in mammalian cells. Biol Rev Camb Philos Soc 2017; 93:827-844. [PMID: 28941010 DOI: 10.1111/brv.12373] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Revised: 08/22/2017] [Accepted: 08/25/2017] [Indexed: 12/25/2022]
Abstract
In yeast, a sequence of physical and genetic interactions termed the endoplasmic reticulum (ER)-mitochondria organizing network (ERMIONE) controls mitochondria-ER interactions and mitochondrial biogenesis. Several functions that characterize ERMIONE complexes are conserved in mammalian cells, suggesting that a similar tethering complex must exist in metazoans. Recent studies have identified a new family of nuclear-encoded ATPases associated with diverse cellular activities (AAA+-ATPase) mitochondrial membrane proteins specific to multicellular eukaryotes, called the ATPase family AAA domain-containing protein 3 (ATAD3) proteins (ATAD3A and ATAD3B). These proteins are crucial for normal mitochondrial-ER interactions and lie at the heart of processes underlying mitochondrial biogenesis. ATAD3A orthologues have been studied in flies, worms, and mammals, highlighting the widespread importance of this gene during embryonic development and in adulthood. ATAD3A is a downstream effector of target of rapamycin (TOR) signalling in Drosophila and exhibits typical features of proteins from the ERMIONE-like complex in metazoans. In humans, mutations in the ATAD3A gene represent a new link between altered mitochondrial-ER interaction and recognizable neurological syndromes. The primate-specific ATAD3B protein is a biomarker of pluripotent embryonic stem cells. Through negative regulation of ATAD3A function, ATAD3B supports mitochondrial stemness properties.
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Affiliation(s)
- Jacques Baudier
- Aix Marseille Université, CNRS, IBDM, 13284, Marseille Cedex 07, France.,Institut de Biologie du Développement de Marseille-UMR CNRS 7288, 13288, Marseille Cedex 9, France
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178
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Kundu P, Dutta D, Kumar Das A. The α1β1 region is crucial for biofilm enhancement activity of MTC28 in Mycobacterium smegmatis. FEBS Lett 2017; 591:3333-3347. [PMID: 28833086 DOI: 10.1002/1873-3468.12823] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 08/12/2017] [Accepted: 08/15/2017] [Indexed: 11/09/2022]
Abstract
We show here that MTC28, a secretory antigen of 28 kDa from Mycobacterium tuberculosis, is involved in biofilm formation. The exogenous addition of MTC28 to the culture medium as well its expression in Mycobacterium smegmatis mc2 155 shows an enhancement in biofilm formation, which leads to drug resistance. Structural analysis of MTC28 followed by mutational studies confirms the role of its α1β1 region in the biofilm enhancement activity. Confocal and flow cytometry studies show that the α1β1 region of MTC28 is crucial for binding to the M. smegmatis cell wall. The enhancement in biofilm formation due to MTC28 is also observed in M. tuberculosis H37Ra. This is the first report on the structure-function relationship of MTC28.
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Affiliation(s)
- Prasun Kundu
- Department of Biotechnology, Indian Institute of Technology Kharagpur, West Bengal, India
| | - Debabrata Dutta
- Department of Biotechnology, Indian Institute of Technology Kharagpur, West Bengal, India
| | - Amit Kumar Das
- Department of Biotechnology, Indian Institute of Technology Kharagpur, West Bengal, India
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179
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Antonaru LA, Nürnberg DJ. Role of PatS and cell type on the heterocyst spacing pattern in a filamentous branching cyanobacterium. FEMS Microbiol Lett 2017; 364:3983256. [PMID: 28859320 PMCID: PMC5812504 DOI: 10.1093/femsle/fnx154] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Accepted: 07/19/2017] [Indexed: 12/16/2022] Open
Abstract
Cell differentiation is one of the marks of multicellular organisms. Terminally specialised nitrogen-fixing cells, termed heterocysts, evolved in filamentous cyanobacteria more than 2 Gya. The development of their spacing pattern has been thoroughly investigated in model organisms such as Anabaena sp. PCC 7120. This paper focuses on the more complex, branching cyanobacterium Mastigocladus laminosus (Stigonematales). Contrary to what has been previously published, a heterocyst spacing pattern is present in M. laminosus but it varies with the age of the culture and the morphology of the cells. Heterocysts in young, narrow trichomes were more widely spaced (∼14.8 cells) than those in old, wide trichomes (∼9.4 cells). Biochemical and transgenic experiments reveal that the heterocyst spacing pattern is affected by the heterocyst inhibitor PatS. Addition of the pentapeptide RGSGR (PatS-5) to the growth medium and overexpression of patS from Anabaena sp. PCC 7120 in M. laminosus resulted in the loss of heterocyst differentiation under nitrogen deprivation. Bioinformatics investigations indicated that putative PatS sequences within cyanobacteria are highly diverse, and fall into two main clades. Both are present in most branching cyanobacteria. Despite its more complex, branching phenotype, M. laminosus appears to use a PatS-based pathway for heterocyst differentiation, a property shared by Anabaena/Nostoc.
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180
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Leskinen T, Witos J, Valle-Delgado JJ, Lintinen K, Kostiainen M, Wiedmer SK, Österberg M, Mattinen ML. Adsorption of Proteins on Colloidal Lignin Particles for Advanced Biomaterials. Biomacromolecules 2017; 18:2767-2776. [PMID: 28724292 DOI: 10.1021/acs.biomac.7b00676] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Coating of colloidal lignin particles (CLPs), or lignin nanoparticles (LNPs), with proteins was evaluated in order to establish a safe, self-assembly mediated modification technique to tune their surface chemistry. Gelatin and poly- l-lysine formed the most pronounced protein corona on the CLP surface, as determined by dynamic light scattering (DLS) and zeta potential measurements. Spherical morphology of individual protein coated CLPs was confirmed by transmission electron (TEM) and atomic force (AFM) microscopy. A mechanistic adsorption study with several random coiled and globular model proteins was carried out using quartz crystal microbalance with dissipation monitoring (QCM-D). The three-dimensional (3D) protein fold structure and certain amino acid interactions were decisive for the protein adsorption on the lignin surface. The main driving forces for protein adsorption were electrostatic, hydrophobic, and van der Waals interactions, and hydrogen bonding. The relative contributions of these interactions were highly dependent on the ionic strength of the surrounding medium. Capillary electrophoresis (CE) and Fourier transform infrared spectroscopy (FTIR) provided further evidence of the adsorption-enhancing role of specific amino acid residues such as serine and proline. These results have high impact on the utilization of lignin as colloidal particles in biomedicine and biodegradable materials, as the protein corona enables tailoring of the CLP surface chemistry for intended applications.
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Affiliation(s)
- Timo Leskinen
- Bioproduct Chemistry, Department of Bioproducts and Biosystems (Bio2), Aalto University , P.O. Box 16300, FI-00076 Aalto, Espoo, Finland
| | - Joanna Witos
- University of Helsinki , Department of Chemistry, A.I. Virtasen aukio 1, P.O. Box 55, 00014 Helsinki, Finland
| | - Juan José Valle-Delgado
- Bioproduct Chemistry, Department of Bioproducts and Biosystems (Bio2), Aalto University , P.O. Box 16300, FI-00076 Aalto, Espoo, Finland
| | - Kalle Lintinen
- Biohybrid Materials, Department of Bioproducts and Biosystems (Bio2), Aalto University , P.O. Box 16300, FI-00076 Aalto, Espoo, Finland
| | - Mauri Kostiainen
- Biohybrid Materials, Department of Bioproducts and Biosystems (Bio2), Aalto University , P.O. Box 16300, FI-00076 Aalto, Espoo, Finland
| | - Susanne K Wiedmer
- University of Helsinki , Department of Chemistry, A.I. Virtasen aukio 1, P.O. Box 55, 00014 Helsinki, Finland
| | - Monika Österberg
- Bioproduct Chemistry, Department of Bioproducts and Biosystems (Bio2), Aalto University , P.O. Box 16300, FI-00076 Aalto, Espoo, Finland
| | - Maija-Liisa Mattinen
- Bioproduct Chemistry, Department of Bioproducts and Biosystems (Bio2), Aalto University , P.O. Box 16300, FI-00076 Aalto, Espoo, Finland
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181
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Yadav P, Shahane G, Gaikwad S. Amaranthus caudatus lectin with polyproline II fold: conformational and functional transitions and molecular dynamics. J Biomol Struct Dyn 2017; 36:2203-2215. [DOI: 10.1080/07391102.2017.1345328] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Priya Yadav
- Academy of Scientific and Innovative Research (AcSIR) NCL campus, Biochemical Sciences Division, CSIR-NCL, Pune, India
- Biochemical Sciences Division, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pune 411008, India
| | - Ganesh Shahane
- Institute of Bioengineering, Queen Mary University of London, Mile End Road, London, UK
| | - Sushama Gaikwad
- Biochemical Sciences Division, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pune 411008, India
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182
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Kim SH, Lee JY, Balolong MP, Kim JE, Paik HD, Kang DK. Identification and Characterization of a Novel Antioxidant Peptide from Bovine Skim Milk Fermented by Lactococcus lactis SL6. Korean J Food Sci Anim Resour 2017; 37:402-409. [PMID: 28747826 PMCID: PMC5516067 DOI: 10.5851/kosfa.2017.37.3.402] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 05/17/2017] [Accepted: 05/27/2017] [Indexed: 11/06/2022] Open
Abstract
A novel peptide having free radical scavenging activity was separated, using an on-line high-performance liquid chromatography (HPLC) - ABTS screening method, from bovine skim milk fermented by Lactococcus lactis SL6 (KCTC 11865BP). It was further purified using reverse phase-HPLC (RP-HPLC) and sequenced by RP-HPLC-tandem mass spectrometry. The amino acid sequence of the identified peptide was determined to be Phe-Ser-Asp-Ile-Pro-Asn-Pro-Ile-Gly-Ser-Glu-Asn-Ser-Glu-Lys-Thr-Thr-Met-Pro-Leu-Trp (2,362 Da), which is corresponding to the C-terminal fragment of bovine αs1-casein (f179-199). The hydroxyl radicals scavenging activity (IC50 28.25±0.96 μM) of the peptide chemically synthesized based on the MS/MS data showed a slightly lower than that of the natural antioxidant Trolox (IC50 15.37±0.52 μM). Furthermore, derivatives of the antioxidant peptide were synthesized. The antioxidative activity of the derivatives whose all three proline residues replaced by alanine significantly decreased, whereas replacement of two proline residues in N-terminal region did not affect its antioxidative activity, indicating that 3rd proline in C-terminal region is critical for the antioxidative activity of the peptide identified in this study. In addition, N-terminal region of the antioxidant peptide did not show its activity, whereas C-terminal region maintained antioxidative activity, suggesting that C-terminal region of the peptide is important for antioxidative activity.
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Affiliation(s)
- Sang Hoon Kim
- Department of Animal Resource Science, Dankook University, Cheonan 31116, Korea
| | - Ji Yoon Lee
- National Instrumentation Center for Environmental Management, Seoul National University, Seoul 08826, Korea
| | - Marilen P Balolong
- Department of Animal Resource Science, Dankook University, Cheonan 31116, Korea.,Department of Biology, College of Arts and Sciences, University of Philippines, Manila 1000, Philippines
| | - Jin-Eung Kim
- R&D Center, Cell Biotech Co., Ltd., Gimpo 10003, Korea
| | - Hyun-Dong Paik
- Department of Food Science and Biotechnology of Animal Resources, Konkuk University, Seoul 05029, Korea
| | - Dae-Kyung Kang
- Department of Animal Resource Science, Dankook University, Cheonan 31116, Korea
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183
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Wu Q, Lian JB, Stein JL, Stein GS, Nickerson JA, Imbalzano AN. The BRG1 ATPase of human SWI/SNF chromatin remodeling enzymes as a driver of cancer. Epigenomics 2017; 9:919-931. [PMID: 28521512 PMCID: PMC5705788 DOI: 10.2217/epi-2017-0034] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Mammalian SWI/SNF enzymes are ATP-dependent remodelers of chromatin structure. These multisubunit enzymes are heterogeneous in composition; there are two catalytic ATPase subunits, BRM and BRG1, that are mutually exclusive, and additional subunits are incorporated in a combinatorial manner. Recent findings indicate that approximately 20% of human cancers contain mutations in SWI/SNF enzyme subunits, leading to the conclusion that the enzyme subunits are critical tumor suppressors. However, overexpression of specific subunits without apparent mutation is emerging as an alternative mechanism by which cellular transformation may occur. Here we highlight recent evidence linking elevated expression of the BRG1 ATPase to tissue-specific cancers and work suggesting that inhibiting BRG1 may be an effective therapeutic strategy.
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Affiliation(s)
- Qiong Wu
- Department of Pediatrics, University of Massachusetts Medical School, 55 Lake Avenue North, Worcester, MA 01655, USA
| | - Jane B Lian
- Department of Biochemistry, University of Vermont College of Medicine, 89 Beaumont Avenue, Burlington, VT 05405, USA
| | - Janet L Stein
- Department of Biochemistry, University of Vermont College of Medicine, 89 Beaumont Avenue, Burlington, VT 05405, USA
| | - Gary S Stein
- Department of Biochemistry, University of Vermont College of Medicine, 89 Beaumont Avenue, Burlington, VT 05405, USA
| | - Jeffrey A Nickerson
- Department of Pediatrics, University of Massachusetts Medical School, 55 Lake Avenue North, Worcester, MA 01655, USA
| | - Anthony N Imbalzano
- Department of Biochemistry & Molecular Pharmacology, University of Massachusetts Medical School, 364 Plantation Street, Worcester, MA 01605, USA
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184
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Chen J, Xu X, Tao H, Li Y, Nan H, Wang Y, Tian M, Chen H. Structural Analysis of Porcine Reproductive and Respiratory Syndrome Virus Non-structural Protein 7α (NSP7α) and Identification of Its Interaction with NSP9. Front Microbiol 2017; 8:853. [PMID: 28553277 PMCID: PMC5425468 DOI: 10.3389/fmicb.2017.00853] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2017] [Accepted: 04/26/2017] [Indexed: 11/23/2022] Open
Abstract
Non-structural protein 7 (NSP7), which can be further cleaved into NSP7α and NSP7β, is one of the most conserved proteins of porcine reproductive and respiratory syndrome virus (PRRSV). NSP7 plays a role in provoking the humoral immune system in PRRSV-infected swine, but its structure and function are still not fully understood. Here, we analyzed the expression of NSP7, NSP7α, and NSP7β in PRRSV-infected MARC-145 cells. The solution structure of NSP7α was determined by using nuclear magnetic resonance (NMR). Although the structure provided little clue to its function, based on the structure of NSP7α, we predicted and further identified some key amino acids on NSP7α for the interaction of NSP7α with NSP9, the RNA dependent RNA polymerase of PRRSV. This study provided some new insights into the structure and function of PRRSV NSP7.
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Affiliation(s)
- Jiaping Chen
- College of Life Sciences, Northwest A&F UniversityYangling, China
| | - Xiaodong Xu
- College of Life Sciences, Northwest A&F UniversityYangling, China
| | - Hu Tao
- College of Science, Northwest A&F UniversityYangling, China
| | - Yuan Li
- College of Life Sciences, Northwest A&F UniversityYangling, China
| | - Hao Nan
- College of Life Sciences, Northwest A&F UniversityYangling, China
| | - Yuanyuan Wang
- College of Life Sciences, Northwest A&F UniversityYangling, China
| | - Mengmeng Tian
- College of Life Sciences, Northwest A&F UniversityYangling, China
| | - Hongying Chen
- College of Life Sciences, Northwest A&F UniversityYangling, China
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185
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Randell A, Daneshtalab N. Elastin microfibril interface-located protein 1, transforming growth factor beta, and implications on cardiovascular complications. ACTA ACUST UNITED AC 2017; 11:437-448. [PMID: 28545768 DOI: 10.1016/j.jash.2017.04.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Revised: 03/07/2017] [Accepted: 04/20/2017] [Indexed: 01/12/2023]
Abstract
Elastin microfibril interface-located protein 1 (EMILIN1), a glycoprotein, is associated with elastin in the extracellular matrix (ECM) of arteries, lymph vasculature, and other tissues. EMILIN1 particularly has a niche role in elastin fiber biogenesis (elastogenesis) by aiding with the fusion of elastin fibers, rendering them more ordered. In addition to elastogenesis, EMILIN1 has been shown to have roles in maintenance of vascular cell morphology, smooth muscle cell adhesion to elastic fibers, and transforming growth factor (TGFβ) regulation, by inhibiting TGFβ activation via blocking the proteolytic production of the latency-associated peptide/active TGFβ complex. The increased TGFβ signaling induced during EMILIN1 deficiency alters TGFβ activity, resulting in vascular smooth muscle cell growth and vascular remodeling. The increasing systemic blood pressure associated with TGFβ signaling may be closely linked to the activity of other mediators that affect cardiovascular homeostasis, such as angiotensin II. The increase in prevalence of hypertension and other cardiovascular diseases in other disease states likely involve a complex activation of TGFβ signaling and ECM dysfunction. Thus, the interaction of TGFβ and ECM components appears to be integrative involving both structural alterations to vessels through EMILIN1 and changes in TGFβ signaling processes. This review summarizes the current knowledge on the EMILIN1-TGFβ relationship; the specific roles of EMILIN1 and TGFβ in blood pressure regulation, their synergistic interaction, and in particular the role of TGFβ (in conjunction with ECM proteins) in other disease states altering cardiovascular homeostasis.
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Affiliation(s)
- Amy Randell
- Health Sciences Center, School of Pharmacy, Memorial University of Newfoundland, St. John's, Newfoundland, Canada
| | - Noriko Daneshtalab
- Health Sciences Center, School of Pharmacy, Memorial University of Newfoundland, St. John's, Newfoundland, Canada.
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186
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187
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Muthuramalingam M, Wang Y, Li Y, Mahalingam R. Interacting protein partners of Arabidopsis RNA-binding protein AtRBP45b. PLANT BIOLOGY (STUTTGART, GERMANY) 2017; 19:327-334. [PMID: 28039930 DOI: 10.1111/plb.12540] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Accepted: 12/29/2016] [Indexed: 05/19/2023]
Abstract
RNA binding proteins, important players in post-transcriptional gene regulation, usually exist in ribonuclear complexes. However, even in model systems like Arabidopsis characterisation of RBP associated proteins is limited. In this study, we investigated the interacting proteins of the Arabidopsis AtRBP45b, which is involved in stress signalling. In vivo localisation of AtRBP45b was conducted using 35S-GFP. FLAG-tagged AtRBP45b under control of the 35S promoter in the Atrbp45b-1 mutant background was used to pull down AtRBP45b interacting proteins. Yeast two-hybrid analysis, fluorescence energy resonance transfer assays were used to confirm the veracity of the AtRBP45b interacting proteins. In planta GFP-tagging indicated AtRBP45b is localised to the nucleus and the cytosol. AtRBP45b protein has a N-terminal proline-rich region and a C-terminal glutamine-rich domain that are usually involved in protein-protein interactions. Co-immunoprecipitation followed by mass spectrometry-based protein sequencing led to identification of 30 proteins that interacted with AtRBP45b. Using information from interactome databases (BIOGRID, INTACT and STRING), pull-down assays and localisation data, 12 putative interacting proteins were selected for yeast two-hybrid analysis. Cap-binding protein (CBP20, At5g44200) and polyA-binding protein (PAB8, At1g49760) were shown to interact with AtRBP45b. Based on its interacting partners we speculate that AtRBP45b may play an important role in RNA metabolism, especially in aspects related to mRNA stability and translation initiation during stress conditions in plants.
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Affiliation(s)
- M Muthuramalingam
- Department of Biochemistry and Molecular Biology, Oklahoma State University, Stillwater, OK, USA
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK, USA
| | - Y Wang
- Department of Biochemistry and Molecular Biology, Oklahoma State University, Stillwater, OK, USA
- Department of Plant Biology, Ecology and Evolution, Oklahoma State University, Stillwater, OK, USA
| | - Y Li
- Department of Biochemistry and Molecular Biology, Oklahoma State University, Stillwater, OK, USA
- College of Life Sciences, Henan Normal University, Xinxiang, Henan, China
| | - R Mahalingam
- Department of Biochemistry and Molecular Biology, Oklahoma State University, Stillwater, OK, USA
- USDA-ARS, Cereal Crops Research Unit, Madison, WI, USA
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188
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Ishikawa Y, Mizuno K, Bächinger HP. Ziploc-ing the structure 2.0: Endoplasmic reticulum-resident peptidyl prolyl isomerases show different activities toward hydroxyproline. J Biol Chem 2017; 292:9273-9282. [PMID: 28385890 DOI: 10.1074/jbc.m116.772657] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 03/27/2017] [Indexed: 12/21/2022] Open
Abstract
Extracellular matrix proteins are biosynthesized in the rough endoplasmic reticulum (rER), and the triple-helical protein collagen is the most abundant extracellular matrix component in the human body. Many enzymes, molecular chaperones, and post-translational modifiers facilitate collagen biosynthesis. Collagen contains a large number of proline residues, so the cis/trans isomerization of proline peptide bonds is the rate-limiting step during triple-helix formation. Accordingly, the rER-resident peptidyl prolyl cis/trans isomerases (PPIases) play an important role in the zipper-like triple-helix formation in collagen. We previously described this process as "Ziploc-ing the structure" and now provide additional information on the activity of individual rER PPIases. We investigated the substrate preferences of these PPIases in vitro using type III collagen, the unhydroxylated quarter fragment of type III collagen, and synthetic peptides as substrates. We observed changes in activity of six rER-resident PPIases, cyclophilin B (encoded by the PPIB gene), FKBP13 (FKBP2), FKBP19 (FKBP11), FKBP22 (FKBP14), FKBP23 (FKBP7), and FKBP65 (FKBP10), due to posttranslational modifications of proline residues in the substrate. Cyclophilin B and FKBP13 exhibited much lower activity toward post-translationally modified substrates. In contrast, FKBP19, FKBP22, and FKBP65 showed increased activity toward hydroxyproline-containing peptide substrates. Moreover, FKBP22 showed a hydroxyproline-dependent effect by increasing the amount of refolded type III collagen in vitro and FKBP19 seems to interact with triple helical type I collagen. Therefore, we propose that hydroxyproline modulates the rate of Ziploc-ing of the triple helix of collagen in the rER.
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Affiliation(s)
- Yoshihiro Ishikawa
- From the Department of Biochemistry and Molecular Biology, Oregon Health & Science University and.,Research Department, Shriners Hospital for Children, Portland, Oregon 97239
| | - Kazunori Mizuno
- Research Department, Shriners Hospital for Children, Portland, Oregon 97239
| | - Hans Peter Bächinger
- From the Department of Biochemistry and Molecular Biology, Oregon Health & Science University and .,Research Department, Shriners Hospital for Children, Portland, Oregon 97239
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189
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Xiao J, Yan C, Zhou W, Li J, Wu H, Chen T, Feng H. CARD and TM of MAVS of black carp play the key role in its self-association and antiviral ability. FISH & SHELLFISH IMMUNOLOGY 2017; 63:261-269. [PMID: 28232279 DOI: 10.1016/j.fsi.2017.02.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 02/15/2017] [Accepted: 02/17/2017] [Indexed: 06/06/2023]
Abstract
Mitochondrial antiviral signaling protein (MAVS) is an adaptor protein of the innate immune system of higher vertebrate. In this paper, the transcription profile of black carp MAVS (bcMAVS) in host cells in response to spring viremia of carp virus (SVCV) and grass carp reovirus (GCRV) infection was identified. EPC cells expressing bcMAVS possessed obviously enhanced antiviral activity against both SVCV and GCRV. Immunofluorescence (IF) staining data demonstrated that bcMAVS molecules were redistributed and formed aggregates on the mitochondria of EPC cells after virus infection. Co-immunoprecipitation (co-IP) assay in HEK293T cells demonstrated that bcMAVS proteins bound to each other, which suggested that this fish protein owned self-association in vivo. IF assay identified that the transmembrane (TM) domain of bcMAVS was crucial for its mitochondrial localization. Co-IP assays among bcMAVS mutants demonstrated that both N-terminal caspase recruitment domain (CARD) and TM domain were indispensible for dimerization of bcMAVS. It was interesting that Truncated-bcMAVS possessed much enhanced interferon-inducing activity and antiviral ability than wild type bcMAVS, which only contains CARD and TM. All the data generated in this study support the idea that oligomerization of bcMAVS on mitochondrion is crucial for the antiviral ability of bcMAVS, which is depend on both CARD and TM domain of this fish MAVS orthologue.
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Affiliation(s)
- Jun Xiao
- State Key Laboratory of Developmental Biology of Freshwater Fish, Hunan Normal University, Changsha 410081, China; College of Life Science, Hunan Normal University, Changsha 410081, China
| | - Chuanzhe Yan
- State Key Laboratory of Developmental Biology of Freshwater Fish, Hunan Normal University, Changsha 410081, China; College of Life Science, Hunan Normal University, Changsha 410081, China
| | - Wei Zhou
- State Key Laboratory of Developmental Biology of Freshwater Fish, Hunan Normal University, Changsha 410081, China; College of Life Science, Hunan Normal University, Changsha 410081, China
| | - Jun Li
- State Key Laboratory of Developmental Biology of Freshwater Fish, Hunan Normal University, Changsha 410081, China; College of Life Science, Hunan Normal University, Changsha 410081, China
| | - Hui Wu
- State Key Laboratory of Developmental Biology of Freshwater Fish, Hunan Normal University, Changsha 410081, China; College of Life Science, Hunan Normal University, Changsha 410081, China
| | - Tiansheng Chen
- College of Fisheries, Huazhong Agricultural University, Wuhan 410081, China
| | - Hao Feng
- State Key Laboratory of Developmental Biology of Freshwater Fish, Hunan Normal University, Changsha 410081, China; College of Life Science, Hunan Normal University, Changsha 410081, China.
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190
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191
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Kubyshkin V, Budisa N. Construction of a polyproline structure with hydrophobic exterior using octahydroindole-2-carboxylic acid. Org Biomol Chem 2017; 15:619-627. [DOI: 10.1039/c6ob02306a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Oligomeric octahydroindole-2-carboxilic acid (Oic) forms a stable polyproline-II type helix.
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Affiliation(s)
- Vladimir Kubyshkin
- Biocatalysis group
- Institute of Chemistry
- Technical University of Berlin
- Berlin
- Germany
| | - Nediljko Budisa
- Biocatalysis group
- Institute of Chemistry
- Technical University of Berlin
- Berlin
- Germany
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192
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Patra AP, Sharma S, Ainavarapu SRK. Force Spectroscopy of the Plasmodium falciparum Vaccine Candidate Circumsporozoite Protein Suggests a Mechanically Pliable Repeat Region. J Biol Chem 2016; 292:2110-2119. [PMID: 28031457 DOI: 10.1074/jbc.m116.754796] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Revised: 12/26/2016] [Indexed: 11/06/2022] Open
Abstract
The most effective vaccine candidate of malaria is based on the Plasmodium falciparum circumsporozoite protein (CSP), a major surface protein implicated in the structural strength, motility, and immune evasion properties of the infective sporozoites. It is suspected that reversible conformational changes of CSP are required for infection of the mammalian host, but the detailed structure and dynamic properties of CSP remain incompletely understood, limiting our understanding of its function in the infection. Here, we report the structural and mechanical properties of the CSP studied using single-molecule force spectroscopy on several constructs, one including the central region of CSP, which is rich in NANP amino acid repeats (CSPrep), and a second consisting of a near full-length sequence without the signal and anchor hydrophobic domains (CSPΔHP). Our results show that the CSPrep is heterogeneous, with 40% of molecules requiring virtually no mechanical force to unfold (<10 piconewtons (pN)), suggesting that these molecules are mechanically compliant and perhaps act as entropic springs, whereas the remaining 60% are partially structured with low mechanical resistance (∼70 pN). CSPΔHP having multiple force peaks suggests specifically folded domains, with two major populations possibly indicating the open and collapsed forms. Our findings suggest that the overall low mechanical resistance of the repeat region, exposed on the outer surface of the sporozoites, combined with the flexible full-length conformations of CSP, may provide the sporozoites not only with immune evasion properties, but also with lubricating capacity required during its navigation through the mosquito and vertebrate host tissues. We anticipate that these findings would further assist in the design and development of future malarial vaccines.
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Affiliation(s)
| | | | - Sri Rama Koti Ainavarapu
- Chemical Sciences, Tata Institute of Fundamental Research, Dr. Homi Bhabha Road, Colaba, Mumbai 400005, India
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193
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Effect of Linker Length and Flexibility on the Clostridium thermocellum Esterase Displayed on Bacillus subtilis Spores. Appl Biochem Biotechnol 2016; 182:168-180. [DOI: 10.1007/s12010-016-2318-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Accepted: 10/31/2016] [Indexed: 01/23/2023]
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194
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Proctor GB, Pramanik R, Carpenter GH, Rees GD. Salivary Proteins Interact with Dietary Constituents to Modulate Tooth Staining. J Dent Res 2016; 84:73-8. [PMID: 15615880 DOI: 10.1177/154405910508400113] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Dietary components rich in polyphenols—for example, tea and red wine—are thought to cause tooth staining. In the present study, hydroxyapatite was used as a model of enamel for study of the influence of salivary proteins on the binding of different polyphenols to hydroxyapatite in vitro. Neither salivary protein pellicles nor salivary proteins in solution significantly altered the binding of the small polyphenol epigallocatechin to hydroxyapatite. However, hydroxyapatite binding of anthocyanin, a small grape-skin-derived polyphenol, or the larger polyphenols of black tea was increased by the presence of salivary proteins, either as a pellicle or in solution. Proline-rich proteins were enriched from parotid saliva and found to increase binding of anthocyanin and black tea polyphenols to hydroxyapatite, while enriched histatins did not increase binding. It is concluded that some salivary proteins, including proline-rich protein, can mediate increased staining of enamel by red-wine- and black-tea-derived polyphenols.
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Affiliation(s)
- G B Proctor
- Salivary Research Unit, King's College London, Floor 17, Guy's Tower, London SE1 9RT, UK.
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195
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Margolis HC, Beniash E, Fowler CE. Role of Macromolecular Assembly of Enamel Matrix Proteins in Enamel Formation. J Dent Res 2016; 85:775-93. [PMID: 16931858 DOI: 10.1177/154405910608500902] [Citation(s) in RCA: 205] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Unlike other mineralized tissues, mature dental enamel is primarily (> 95% by weight) composed of apatitic crystals and has a unique hierarchical structure. Due to its high mineral content and organized structure, enamel has exceptional functional properties and is the hardest substance in the human body. Enamel formation (amelogenesis) is the result of highly orchestrated extracellular processes that regulate the nucleation, growth, and organization of forming mineral crystals. However, major aspects of the mechanism of enamel formation are not well-understood, although substantial evidence suggests that protein-protein and protein-mineral interactions play crucial roles in this process. The purpose of this review is a critical evaluation of the present state of knowledge regarding the potential role of the assembly of enamel matrix proteins in the regulation of crystal growth and the structural organization of the resulting enamel tissue. This review primarily focuses on the structure and function of amelogenin, the predominant enamel matrix protein. This review also provides a brief description of novel in vitro approaches that have used synthetic macromolecules ( i.e., surfactants and polymers) to regulate the formation of hierarchical inorganic (composite) structures in a fashion analogous to that believed to take place in biological systems, such as enamel. Accordingly, this review illustrates the potential for developing bio-inspired approaches to mineralized tissue repair and regeneration. In conclusion, the authors present a hypothesis, based on the evidence presented, that the full-length amelogenin uniquely regulates proper enamel formation through a process of cooperative mineralization, and not as a pre-formed matrix.
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Affiliation(s)
- H C Margolis
- Department of Biomineralization, The Forsyth Institute, 140 The Fenway, Boston, MA 02115, USA.
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196
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Bianco PR. The tale of SSB. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2016; 127:111-118. [PMID: 27838363 DOI: 10.1016/j.pbiomolbio.2016.11.001] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Accepted: 11/04/2016] [Indexed: 01/07/2023]
Abstract
The E. coli single stranded DNA binding protein (SSB) is essential to all aspects of DNA metabolism. Here, it has two seemingly disparate but equally important roles: it binds rapidly and cooperatively to single stranded DNA (ssDNA) and it binds to partner proteins that constitute the SSB interactome. These two roles are not disparate but are instead, intimately linked. A model is presented wherein the intrinsically disordered linker (IDL) is directly responsible for mediating protein-protein interactions. It does this by binding, via PXXP motifs, to the OB-fold (aka SH3 domain) of a nearby protein. When the nearby protein is another SSB tetramer, this leads to a highly efficient ssDNA binding reaction that rapidly and cooperatively covers and protects the exposed nucleic acid from degradation. Alternatively, when the nearby protein is a member of the SSB interactome, loading of the enzyme onto the DNA takes places.
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Affiliation(s)
- Piero R Bianco
- Center for Single Molecule Biophysics, Department of Biochemistry, University at Buffalo, Buffalo, NY, 14214, USA; Department of Microbiology and Immunology, University at Buffalo, Buffalo, NY, 14214, USA.
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197
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Chin AF, Toptygin D, Elam WA, Schrank TP, Hilser VJ. Phosphorylation Increases Persistence Length and End-to-End Distance of a Segment of Tau Protein. Biophys J 2016; 110:362-371. [PMID: 26789759 DOI: 10.1016/j.bpj.2015.12.013] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Revised: 11/24/2015] [Accepted: 12/07/2015] [Indexed: 11/30/2022] Open
Abstract
Intrinsically disordered regions of proteins, which lack unique tertiary structure under physiological conditions, are enriched in phosphorylation sites and in significant local bias toward the polyproline II conformation. The overrepresented coincidence of this posttranslational regulatory signal and local conformational bias within unstructured regions raises a question: can phosphorylation serve to manipulate the conformational preferences of a disordered protein? In this study, we use time-resolved fluorescence resonance energy transfer and a, to our knowledge, novel data analysis method to directly measure the end-to-end distance distribution of a phosphorylatable peptide derived from the human microtubule associated protein tau. Our results show that phosphorylation at threonine or serine extends the end-to-end distance and increases the effective persistence length of the tested model peptides. Unexpectedly, the extension is independent of salt concentration, suggestive of a nonelectrostatic origin. The phosphorylation extension and stiffening effect provides a peptide-scale physical interpretation for the posttranslational regulation of the highly abundant protein-protein interactions found in disordered proteins, as well as a potential insight into the regulatory mechanism of the tau protein's microtubule binding activity.
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Affiliation(s)
- Alexander F Chin
- Department of Biology, Johns Hopkins University, Baltimore, Maryland
| | - Dmitri Toptygin
- Department of Biology, Johns Hopkins University, Baltimore, Maryland
| | - W Austin Elam
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut
| | - Travis P Schrank
- Department of Otolaryngology, Head and Neck Surgery, Medical University of South Carolina, Charleston, South Carolina
| | - Vincent J Hilser
- Department of Biology, Johns Hopkins University, Baltimore, Maryland; T.C. Jenkins Department of Biophysics, Johns Hopkins University, Baltimore, Maryland.
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198
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Patel SJ, Trivedi GL, Darie CC, Clarkson BD. The possible roles of B-cell novel protein-1 (BCNP1) in cellular signalling pathways and in cancer. J Cell Mol Med 2016; 21:456-466. [PMID: 27680505 PMCID: PMC5323820 DOI: 10.1111/jcmm.12989] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Accepted: 08/12/2016] [Indexed: 01/15/2023] Open
Abstract
B‐cell novel protein‐1 (BCNP1) or Family member of 129C (FAM129C) was identified as a B‐cell‐specific plasma‐membrane protein. Bioinformatics analysis predicted that BCNP1 might be heavily phosphorylated. The BCNP1 protein contains a pleckstrin homology (PH) domain, two proline‐rich (PR) regions and a Leucine Zipper (LZ) domain suggesting that it may be involved in protein‐protein interactions. Using The Cancer Genome Atlas (TCGA) data sets, we investigated the correlation of alteration of the BCNP1 copy‐number changes and mutations in several cancer types. We also investigated the function of BCNP1 in cellular signalling pathways. We found that BCNP1 is highly altered in some types of cancers and that BCNP1 copy‐number changes and mutations co‐occur with other molecular alteration events for TP53 (tumour protein P53), PIK3CA (Phosphatidylinositol‐4,5‐Bisphosphate 3‐Kinase, Catalytic Subunit Alpha), MAPK1 (mitogen‐activated protein kinase‐1; ERK: extracellular signal regulated kinase), KRAS (Kirsten rat sarcoma viral oncogene homolog) and AKT2 (V‐Akt Murine Thymoma Viral Oncogene Homolog 2). We also found that PI3K (Phoshoinositide 3‐kinase) inhibition and p38 MAPK (p38 mitogen‐activated protein kinase) activation leads to reduction in phosphorylation of BCNP1 at serine residues, suggesting that BCNP1 phosphorylation is PI3K and p38MAPK dependent and that it might be involved in cancer. Its degradation depends on a proteasome‐mediated pathway.
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Affiliation(s)
- Sapan J Patel
- Memorial Sloan Kettering Cancer Center, Molecular Pharmacology and Chemistry Program, New York, NY, USA.,Department of Chemistry and Biomolecular Science, Clarkson University, Biochemistry and Proteomics Group, Potsdam, NY, USA
| | | | - Costel C Darie
- Department of Chemistry and Biomolecular Science, Clarkson University, Biochemistry and Proteomics Group, Potsdam, NY, USA
| | - Bayard D Clarkson
- Memorial Sloan Kettering Cancer Center, Molecular Pharmacology and Chemistry Program, New York, NY, USA
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199
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Kumar P, Bansal M. Structural and functional analyses of PolyProline-II helices in globular proteins. J Struct Biol 2016; 196:414-425. [PMID: 27637571 DOI: 10.1016/j.jsb.2016.09.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 09/01/2016] [Accepted: 09/12/2016] [Indexed: 11/18/2022]
Abstract
PolyProline-II (PPII) helices are defined as a continuous stretch of a protein chain in which the constituent residues have backbone torsion angle (φ, ψ) values of (-75°, 145°) and take up an extended left handed helical conformation, without any intra-chain hydrogen bonds. They are found to occur quite frequently in protein structures, with their number exceeding that of π-helices, though it is considerably less than that of α-helices and β-strands. A relatively new procedure, ASSP, for the identification of regular secondary structures using Cα trace identifies 3597 PPII-helices in 3582 protein chains, solved at resolution ⩽2.0Å. Taking advantage of this significantly expanded database of PPII-helices, we have analyzed their structural and functional roles as well as determined the amino acid propensity within and around them. Though Pro residues are highly preferred, their presence is not a mandatory requirement for the formation of PPII-helices, since ∼40% PPII-helices were found to contain no Pro residues. Aromatic amino acids are avoided within this helix, while Gly, Asn and Asp residues are preferred in the proximal flanking regions. The PPII-helices range from 3 to 13 residues in length with the average twist and rise being -121.2°±9.2° and 3.0ű0.1Å respectively. A majority (∼72%) of PPII-helices were found to occur in conjunction with α-helices and β-strands, and serve as linkers as well. The analysis of various intra-helical non-bonded interactions revealed frequent presence of CH⋯O H-bonds. PPII-helices participate in maintaining the three-dimensional structure of proteins and are important constituents of binding motifs involved in various biological functions.
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Affiliation(s)
- Prasun Kumar
- Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560012, India
| | - Manju Bansal
- Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560012, India.
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