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https://doi.org/10.1016/j.jmb.2018.11.014
Title: | Calcium-mediated Protein Folding and Stabilization of Salmonella Biofilm-associated Protein A | Authors: | YAO, MINGXI BAKER, KAREN YANG, LIANG GOULT, BENJAMIN T DOYLE, PATRICK S YAN, JIE GUTTULA DURGARAO |
Keywords: | Science & Technology Life Sciences & Biomedicine Biochemistry & Molecular Biology magnetic tweezers calcium-binding protein mechanical stability of proteins biofilm-associated protein, Salmonella BACTERIAL ADHESION MAGNETIC TWEEZERS BAP EXCHANGE ENTERICA BINDING FAMILY FORCES |
Issue Date: | 18-Jan-2019 | Publisher: | ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD | Citation: | YAO, MINGXI, BAKER, KAREN, YANG, LIANG, GOULT, BENJAMIN T, DOYLE, PATRICK S, YAN, JIE, GUTTULA DURGARAO (2019-01-18). Calcium-mediated Protein Folding and Stabilization of Salmonella Biofilm-associated Protein A. Journal of Molecular Biology 431 (2) : 433-443. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jmb.2018.11.014 | Abstract: | Biofilm-associated proteins (BAPs) are important for early biofilm formation (adhesion) by bacteria and are also found in mature biofilms. BapA from Salmonella is a ~ 386-kDa surface protein, comprising 27 tandem repeats predicted to be bacterial Ig-like (BIg) domains. Such tandem repeats are conserved for BAPs across different bacterial species, but the function of these domains is not completely understood. In this work, we report the first study of the mechanical stability of the BapA protein. Using magnetic tweezers, we show that the folding of BapA BIg domains requires calcium binding and the folded domains have differential mechanical stabilities. Importantly, we identify that > 100 nM concentration of calcium is needed for folding of the BIg domains, and the stability of the folded BIg domains is regulated by calcium over a wide concentration range from sub-micromolar (μM) to millimolar (mM). Only at mM calcium concentrations, as found in the extracellular environment, do the BIg domains have the saturated mechanical stability. BapA has been suggested to be involved in Salmonella invasion, and it is likely a crucial mechanical component of biofilms. Therefore, our results provide new insights into the potential roles of BapA as a structural maintenance component of Salmonella biofilm and also Salmonella invasion. | Source Title: | Journal of Molecular Biology | URI: | https://scholarbank.nus.edu.sg/handle/10635/155377 | ISSN: | 00222836 10898638 |
DOI: | 10.1016/j.jmb.2018.11.014 |
Appears in Collections: | Staff Publications Elements |
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File | Description | Size | Format | Access Settings | Version | |
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BapA-Authors-copy.pdf | Accepted version | 1.54 MB | Adobe PDF | CLOSED | Published | |
ViewPageProof_YJMBI_65924(1).pdf | 1.6 MB | Adobe PDF | OPEN | Post-print | View/Download |
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