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@ARTICLE{Bunduc:457180,
author = {Bunduc, Catalin and Fahrenkamp, Dirk and Wald, Jiri and
Ummels, Roy and bitter, wilbert and Houben, Edith and
Marlovits, Thomas},
title = {{S}tructure and dynamics of a mycobacterial type {VII}
secretion system},
journal = {Nature},
volume = {593},
number = {7859},
issn = {0028-0836},
address = {London [u.a.]},
publisher = {Nature Publ. Group},
reportid = {PUBDB-2021-01909},
pages = {445 - 448},
year = {2021},
note = {Cryo EM},
abstract = {Mycobacterium tuberculosis is the cause of one of the most
important infectious diseases in humans, which leads to 1.4
million deaths every year1. Specialized protein transport
systems—known as type VII secretion systems (T7SSs)—are
central to the virulence of this pathogen, and are also
crucial for nutrient and metabolite transport across the
mycobacterial cell envelope2,3. Here we present the
structure of an intact T7SS inner-membrane complex of M.
tuberculosis. We show how the 2.32-MDa ESX-5 assembly, which
contains 165 transmembrane helices, is restructured and
stabilized as a trimer of dimers by the MycP$_5$ protease. A
trimer of MycP$_5$ caps a central periplasmic dome-like
chamber that is formed by three EccB$_5$ dimers, with the
proteolytic sites of MycP$_5$ facing towards the cavity.
This chamber suggests a central secretion and processing
conduit. Complexes without MycP$_5$ show disruption of the
EccB5 periplasmic assembly and increased flexibility, which
highlights the importance of MycP$_5$ for complex integrity.
Beneath the EccB$_5$–MycP$_5$ chamber, dimers of the EccC5
ATPase assemble into three bundles of four transmembrane
helices each, which together seal the potential central
secretion channel. Individual cytoplasmic EccC5 domains
adopt two distinctive conformations that probably reflect
different secretion states. Our work suggests a previously
undescribed mechanism of protein transport and provides a
structural scaffold to aid in the development of drugs
against this major human pathogen.},
cin = {FS-PS / CSSB-UKE},
ddc = {500},
cid = {I:(DE-H253)FS-PS-20131107 / I:(DE-H253)CSSB-UKE-20141216},
pnm = {633 - Life Sciences – Building Blocks of Life: Structure
and Function (POF4-633) / CryoMyco - Atomic dissection of
type VII secretion systems from pathogenic mycobacteria
(101030373)},
pid = {G:(DE-HGF)POF4-633 / G:(EU-Grant)101030373},
experiment = {EXP:(DE-MLZ)NOSPEC-20140101},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:33981042},
UT = {WOS:000650174400004},
doi = {10.1038/s41586-021-03517-z},
url = {https://bib-pubdb1.desy.de/record/457180},
}