The thermophilic bacterium Thermus aquaticus is a well-known source of Taq polymerase. Here, we studied the structure and dynamics of the T. aquaticus cold-shock protein (Ta-Csp) to better understand its thermostability using NMR spectroscopy. We found that Ta-Csp has a five-stranded beta-barrel structure with five salt bridges which are important for more rigid structure and a higher melting temperature (76 degrees C) of Ta-Csp compared to mesophilic and psychrophilic Csps. Microsecond to millisecond time scale exchange processes occur only at the beta1-beta2 surface region of the nucleic acid binding site with an average conformational exchange rate constant of 674s-1. The results imply that thermophilic Ta-Csp has a more rigid structure and may not need high structural flexibility to accommodate nucleic acids upon cold shock compared to its mesophile and psychrophile counterparts.
Structure and flexibility of the thermophilic cold-shock protein of Thermus aquaticus.,Jin B, Jeong KW, Kim Y Biochem Biophys Res Commun. 2014 Aug 4. pii: S0006-291X(14)01377-1. doi:, 10.1016/j.bbrc.2014.07.127. PMID:25101648[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
↑ Jin B, Jeong KW, Kim Y. Structure and flexibility of the thermophilic cold-shock protein of Thermus aquaticus. Biochem Biophys Res Commun. 2014 Aug 4. pii: S0006-291X(14)01377-1. doi:, 10.1016/j.bbrc.2014.07.127. PMID:25101648 doi:http://dx.doi.org/10.1016/j.bbrc.2014.07.127
