Atomic resolution insights into curli fiber biogenesis.

Atomic resolution insights into curli fiber biogenesis.
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DOI:
10.1016/j.str.2011.05.015
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发表时间:
2011-09-07
期刊:
影响因子:
5.7
通讯作者:
Matthews, Steve J.
Matthews, Steve J.
中科院分区:
生物学2区
文献类型:
--
作者:
Taylor, Jonathan D.;Zhou, Yizhou;Salgado, Paula S.;Patwardhan, Ardan;McGuffie, Matt;Pape, Tillmann;Grabe, Grzegorz;Ashman, Elisabeth;Constable, Sean C.;Simpson, Peter J.;Lee, Wei-chao;Cota, Ernesto;Chapman, Matthew R.;Matthews, Steve J.

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Bacteria produce functional amyloid fibers called curli in a controlled, noncytotoxic manner. These extracellular fimbriae enable biofilm formation and promote pathogenicity. Understanding curli biogenesis is important for appreciating microbial lifestyles and will offer clues as to how disease-associated human amyloid formation might be ameliorated. Proteins encoded by the curli specific genes (csgA-G) are required for curli production. We have determined the structure of CsgC and derived the first structural model of the outer-membrane subunit translocator CsgG. Unexpectedly, CsgC is related to the N-terminal domain of DsbD, both in structure and oxido-reductase capability. Furthermore, we show that CsgG belongs to the nascent class of helical outer-membrane macromolecular exporters. A cysteine in a CsgG transmembrane helix is a potential target of CsgC, and mutation of this residue influences curli assembly. Our study provides the first high-resolution structural insights into curli biogenesis. ► CsgC is related to the redox-active N-terminal domain of DsbD ► Outer-membrane transporter CsgG inserts into the membrane via an α-helical oligomer ► The transmembrane domain of CsgG is vital for pore forming and curli assembly ► CsgC appears to affect CsgG pore behavior and biofilm formation
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