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@ARTICLE{Merilinen:321838,
author = {Meriläinen, Gitte and Koski, M. Kristian and Wierenga, Rik
K.},
title = {{T}he extended structure of the periplasmic region of
{C}ds{D}, a structural protein of the type {III} secretion
system of {C}hlamydia trachomatis},
journal = {Protein science},
volume = {25},
number = {5},
issn = {0961-8368},
address = {Hoboken, NJ},
publisher = {Wiley},
reportid = {PUBDB-2017-02769},
pages = {987 - 998},
year = {2016},
abstract = {The type III secretion system (T3SS) is required for the
virulence of many gram-negative bacterial human pathogens.
It is composed of several structural proteins, forming the
secretion needle and its basis, the basal body. In Chlamydia
spp., the T3SS inner membrane ring (IM-ring) of the basal
body is formed by the periplasmic part of CdsD (outer ring)
and CdsJ (inner ring). Here we describe the crystal
structure of the C-terminal, periplasmic part of CdsD, not
including the last 60 residues. Two crystal forms were
obtained, grown in three different crystallization
conditions. In both crystal forms there is one molecule per
asymmetric unit adopting a similar extended structure. The
structures consist of three periplasmic domains (PDs) of
similar αββαβ topology as seen also in the structures
of the homologous PrgH (Salmonella typhimurium) and YscD
(Yersinia enterocolitica). Only in the C2 crystal form,
there is a C-terminal additional helix after the PD3 domain.
The relative orientation of the three subsequent CdsD PD
domains with respect to each other is more extended than in
PrgH but less extended than in YscD. Small-angle X-ray
scattering data show that also in solution this CdsD
construct adopts the same elongated shape. In both crystal
forms the CdsD molecules are packed in a parallel fashion,
using translational crystallographic symmetry. The most
extensive crystal contacts are preserved in both crystal
forms, suggesting a possible mode of assembly of the CdsD
periplasmic part into a 24-mer complex forming the outer
ring of the IM-ring of the T3SS.},
cin = {EMBL / EMBL-User},
ddc = {610},
cid = {I:(DE-H253)EMBL-20120731 / I:(DE-H253)EMBL-User-20120814},
pnm = {6G3 - PETRA III (POF3-622) / BIOSTRUCT-X - Transnational
access and enhancement of integrated Biological Structure
determination at synchrotron X-ray radiation facilities
(283570)},
pid = {G:(DE-HGF)POF3-6G3 / G:(EU-Grant)283570},
experiment = {EXP:(DE-H253)P-P12-20150101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000374686900005},
pubmed = {pmid:26914207},
doi = {10.1002/pro.2906},
url = {https://bib-pubdb1.desy.de/record/321838},
}