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@ARTICLE{Sajko:453195,
author = {Sajko, Sara and Grishkovskaya, Irina and Kostan, Julius and
Graewert, Melissa and Setiawan, Kim and Trübestein, Linda
and Niedermüller, Korbinian and Gehin, Charlotte and
Sponga, Antonio and Puchinger, Martin and Gavin, Anne-Claude
and Leonard, Thomas A. and Svergun, Dimitri I. and Smith,
Terry K. and Morriswood, Brooke and Djinovic-Carugo,
Kristina},
title = {{S}tructures of three {MORN} repeat proteins and a
re-evaluation of the proposed lipid-binding properties of
{MORN} repeats},
journal = {PLOS ONE},
volume = {15},
number = {12},
issn = {1932-6203},
address = {San Francisco, California, US},
publisher = {PLOS},
reportid = {PUBDB-2020-05031},
pages = {e0242677 -},
year = {2020},
abstract = {MORN (Membrane Occupation and Recognition Nexus) repeat
proteins have a wide taxonomic distribution, being found in
both prokaryotes and eukaryotes. Despite this ubiquity, they
remain poorly characterised at both a structural and a
functional level compared to other common repeats. In
functional terms, they are often assumed to be lipid-binding
modules that mediate membrane targeting. We addressed this
putative activity by focusing on a protein composed solely
of MORN repeats—Trypanosoma brucei MORN1. Surprisingly, no
evidence for binding to membranes or lipid vesicles by
TbMORN1 could be obtained either in vivo or in vitro.
Conversely, TbMORN1 did interact with individual
phospholipids. High- and low-resolution structures of the
MORN1 protein from Trypanosoma brucei and homologous
proteins from the parasites Toxoplasma gondii and Plasmodium
falciparum were obtained using a combination of
macromolecular crystallography, small-angle X-ray
scattering, and electron microscopy. This enabled a first
structure-based definition of the MORN repeat itself.
Furthermore, all three structures dimerised via their
C-termini in an antiparallel configuration. The dimers could
form extended or V-shaped quaternary structures depending on
the presence of specific interface residues. This work
provides a new perspective on MORN repeats, showing that
they are protein-protein interaction modules capable of
mediating both dimerisation and oligomerisation.},
cin = {EMBL-User / EMBL},
ddc = {610},
cid = {I:(DE-H253)EMBL-User-20120814 / I:(DE-H253)EMBL-20120731},
pnm = {6G3 - PETRA III (POF3-622)},
pid = {G:(DE-HGF)POF3-6G3},
experiment = {EXP:(DE-H253)P-P12-20150101},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:33296386},
UT = {WOS:000598626100043},
doi = {10.1371/journal.pone.0242677},
url = {https://bib-pubdb1.desy.de/record/453195},
}