期刊
STRUCTURE
卷 16, 期 8, 页码 1226-1237出版社
CELL PRESS
DOI: 10.1016/j.str.2008.05.012
关键词
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资金
- Austrian Science Foundation [P17885 and P18510-B12]
- US Air Force Office of Scientific Research [FA9550-07-1-0313]
- European Commission, Research Infrastructure Action [RII3-CT-2004-506008]
Surface layers (S-layers) comprise the outermost cell envelope component of most archaea and many bacteria. Here we present the structure of the bacteria[ S-layer protein SbsC from Geobacillus stearothermophilus, showing a very elongated and flexible molecule, with strong and specific binding to the secondary cell wall polymer (SCWP). The crystal structure of rSbSC(31--844) revealed a novel fold, consisting of six separate domains, which are connected by short flexible linkers. The N-terminal domain exhibits positively charged residues regularly spaced along the putative ligand binding site matching the distance of the negative charges on the extended SCWP. Upon SCWP binding, a considerable stabilization of the N-terminal domain occurs. These findings provide insight into the processes of S-layer attachment to the underlying cell wall and selfassembly, and also accommodate the observed mechanical strength, the polarity of the S-layer, and the pronounced requirement for surface flexibility inherent to cell growth and division.
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