TY - JOUR

T1 - The Tat-dependent protein translocation pathway

AU - Hou, Bou

AU - Brüser, Thomas

N1 - Funding Information: Support by the Deutsche Forschungsgemeinschaft (grant BR2285/ 1-3) is gratefully acknowledged. Publisher Copyright: © 2011 by Walter de Gruyter Berlin Boston 2011. Copyright: Copyright 2015 Elsevier B.V., All rights reserved.

PY - 2011/12/1

Y1 - 2011/12/1

N2 - The twin-arginine translocation (Tat) pathway is found in bacteria, archaea, and plant chloroplasts, where it is dedicated to the transmembrane transport of fully folded proteins. These proteins contain N-terminal signal peptides with a specific Tat-system binding motif that is recognized by the transport machinery. In contrast to other protein transport systems, the Tat system consists of multiple copies of only two or three usually small (∼8-30 kDa) membrane proteins that oligomerize to two large complexes that transiently interact during translocation. Only one of these complexes includes a polytopic membrane protein, TatC. The other complex consists of TatA. Tat systems of plants, proteobacteria, and several other phyla contain a third component, TatB. TatB is evolutionarily and structurally related to TatA and usually forms tight complexes with TatC. Minimal two-component Tat systems lacking TatB are found in many bacterial and archaeal phyla. They consist of a 'bifunctional' TatA that also covers TatB functionalities, and a TatC. Recent insights into the structure and interactions of the Tat proteins have various important implications.

AB - The twin-arginine translocation (Tat) pathway is found in bacteria, archaea, and plant chloroplasts, where it is dedicated to the transmembrane transport of fully folded proteins. These proteins contain N-terminal signal peptides with a specific Tat-system binding motif that is recognized by the transport machinery. In contrast to other protein transport systems, the Tat system consists of multiple copies of only two or three usually small (∼8-30 kDa) membrane proteins that oligomerize to two large complexes that transiently interact during translocation. Only one of these complexes includes a polytopic membrane protein, TatC. The other complex consists of TatA. Tat systems of plants, proteobacteria, and several other phyla contain a third component, TatB. TatB is evolutionarily and structurally related to TatA and usually forms tight complexes with TatC. Minimal two-component Tat systems lacking TatB are found in many bacterial and archaeal phyla. They consist of a 'bifunctional' TatA that also covers TatB functionalities, and a TatC. Recent insights into the structure and interactions of the Tat proteins have various important implications.

KW - protein folding

KW - protein transport

KW - redox protein biogenesis

KW - twin-arginine translocation

UR - http://www.scopus.com/inward/record.url?scp=84865007676&partnerID=8YFLogxK

U2 - 10.1515/BMC.2011.040

DO - 10.1515/BMC.2011.040

M3 - Review article

AN - SCOPUS:84865007676

VL - 2

SP - 507

EP - 523

JO - Biomolecular Concepts

JF - Biomolecular Concepts

SN - 1868-5021

IS - 6

ER -