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-Structure paper
| タイトル | Structure of the calcium-dependent type 2 secretion pseudopilus. |
|---|---|
| ジャーナル・号・ページ | Nat Microbiol, Vol. 2, Issue 12, Page 1686-1695, Year 2017 |
| 掲載日 | 2017年10月9日 |
著者 | Aracelys López-Castilla / Jenny-Lee Thomassin / Benjamin Bardiaux / Weili Zheng / Mangayarkarasi Nivaskumar / Xiong Yu / Michael Nilges / Edward H Egelman / Nadia Izadi-Pruneyre / Olivera Francetic / ![]() |
| PubMed 要旨 | Many Gram-negative bacteria use type 2 secretion systems (T2SSs) to secrete proteins involved in virulence and adaptation. Transport of folded proteins via T2SS nanomachines requires the assembly of ...Many Gram-negative bacteria use type 2 secretion systems (T2SSs) to secrete proteins involved in virulence and adaptation. Transport of folded proteins via T2SS nanomachines requires the assembly of inner membrane-anchored fibres called pseudopili. Although efficient pseudopilus assembly is essential for protein secretion, structure-based functional analyses are required to unravel the mechanistic link between these processes. Here, we report an atomic model for a T2SS pseudopilus from Klebsiella oxytoca, obtained by fitting the NMR structure of its calcium-bound subunit PulG into the ~5-Å-resolution cryo-electron microscopy reconstruction of assembled fibres. This structure reveals the comprehensive network of inter-subunit contacts and unexpected features, including a disordered central region of the PulG helical stem, and highly flexible C-terminal residues on the fibre surface. NMR, mutagenesis and functional analyses highlight the key role of calcium in PulG folding and stability. Fibre disassembly in the absence of calcium provides a basis for pseudopilus length control, essential for protein secretion, and supports the Archimedes screw model for the type 2 secretion mechanism. |
リンク | Nat Microbiol / PubMed:28993624 / PubMed Central |
| 手法 | EM (らせん対称) / NMR (溶液) |
| 解像度 | 5.0 Å |
| 構造データ | ![]() PDB-5o2y: |
| 化合物 | ![]() ChemComp-CA: |
| 由来 |
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キーワード | PROTEIN TRANSPORT / Klebsiella oxytoca T2SS / major pseudopilin / calcium / helical polymer / bacterial secretion / cryo-EM |
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klebsiella oxytoca (バクテリア)
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