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@ARTICLE{Fislage:207475,
author = {Fislage, M. and Brosens, E. and Deyaert, E. and Spilotros,
Alessandro and Pardon, E. and Loris, R. and Steyaert, J. and
Garcia-Pino, A. and Versees, W.},
title = {{SAXS} {A}nalysis of the t{RNA}-{M}odifying {E}nzyme
{C}omplex {M}nm{E}/{M}nm{G} {R}eveals a {N}ovel
{I}nteraction {M}ode and {GTP}-{I}nduced {O}ligomerization},
journal = {Nucleic acids symposium series},
volume = {42},
number = {9},
issn = {1362-4962},
address = {Oxford},
publisher = {Oxford Univ. Press8619},
reportid = {PUBDB-2015-01363},
pages = {5978 - 5992},
year = {2014},
note = {OA},
abstract = {Transfer ribonucleic acid (tRNA) modifications, especially
at the wobble position, are crucial for proper and efficient
protein translation. MnmE and MnmG form a protein complex
that is implicated in the carboxymethylaminomethyl
modification of wobble uridine (cmnm5U34) of certain tRNAs.
MnmE is a G protein activated by dimerization (GAD), and
active guanosine-5'-triphosphate (GTP) hydrolysis is
required for the tRNA modification to occur. Although
crystal structures of MnmE and MnmG are available, the
structure of the MnmE/MnmG complex (MnmEG) and the nature of
the nucleotide-induced conformational changes and their
relevance for the tRNA modification reaction remain unknown.
In this study, we mainly used small-angle X-ray scattering
to characterize these conformational changes in solution and
to unravel the mode of interaction between MnmE, MnmG and
tRNA. In the nucleotide-free state MnmE and MnmG form an
unanticipated asymmetric α2β2 complex. Unexpectedly, GTP
binding promotes further oligomerization of the MnmEG
complex leading to an α4β2 complex. The transition from
the α2β2 to the α4β2 complex is fast, reversible and
coupled to GTP binding and hydrolysis. We propose a model in
which the nucleotide-induced changes in conformation and
oligomerization of MnmEG form an integral part of the tRNA
modification reaction cycle.},
cin = {EMBL},
ddc = {540},
cid = {I:(DE-H253)EMBL-20120731},
pnm = {DORIS Beamline D1.2 (POF2-54G13) / PETRA Beamline P12
(POF2-54G14)},
pid = {G:(DE-H253)POF2-D1.2-20130405 /
G:(DE-H253)POF2-P12-20130405},
experiment = {EXP:(DE-H253)D-D1.2-20150101 / EXP:(DE-H253)P-P12-20150101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000336495400056},
pubmed = {pmid:24634441},
doi = {10.1093/nar/gku213},
url = {https://bib-pubdb1.desy.de/record/207475},
}