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Substrate-triggered position switching of TatA and TatB during Tat transport in Escherichia coli
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Habersetzer, Johann, Moore, Kristoffer, Cherry, Jon, Buchanan, Grant, Stansfeld, Phillip J. and Palmer, Tracy (2017) Substrate-triggered position switching of TatA and TatB during Tat transport in Escherichia coli. Open Biology, 7 (8). 170091. doi:10.1098/rsob.170091 ISSN 2046-2441.
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Official URL: http://dx.doi.org/10.1098/rsob.170091
Abstract
The twin-arginine protein transport (Tat) machinery mediates the translocation of folded proteins across the cytoplasmic membrane of prokaryotes and the thylakoid membrane of plant chloroplasts. The Escherichia coli Tat system comprises TatC and two additional sequence-related proteins, TatA and TatB. The active translocase is assembled on demand, with substrate-binding at a TatABC receptor complex triggering recruitment and assembly of multiple additional copies of TatA; however, the molecular interactions mediating translocase assembly are poorly understood. A ‘polar cluster’ site on TatC transmembrane (TM) helix 5 was previously identified as binding to TatB. Here, we use disulfide cross-linking and molecular modelling to identify a new binding site on TatC TM helix 6, adjacent to the polar cluster site. We demonstrate that TatA and TatB each have the capacity to bind at both TatC sites, however in vivo this is regulated according to the activation state of the complex. In the resting-state system, TatB binds the polar cluster site, with TatA occupying the TM helix 6 site. However when the system is activated by overproduction of a substrate, TatA and TatB switch binding sites. We propose that this substrate-triggered positional exchange is a key step in the assembly of an active Tat translocase.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||
Journal or Publication Title: | Open Biology | ||||
Publisher: | The Royal Society Publishing | ||||
ISSN: | 2046-2441 | ||||
Official Date: | 16 August 2017 | ||||
Dates: |
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Volume: | 7 | ||||
Number: | 8 | ||||
Article Number: | 170091 | ||||
DOI: | 10.1098/rsob.170091 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Open Access (Creative Commons) |
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