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@ARTICLE{Syson:207454,
author = {Syson, Karl and Stevenson, Clare E. M. and Rashid, Abdul M.
and Saalbach, Gerhard and Tang, Minhong and Tuukkanen, Anne
and Svergun, Dmitri and Withers, Stephen G. and Lawson,
David M. and Bornemann, Stephen},
title = {{S}tructural {I}nsight into {H}ow {S}treptomyces coelicolor
{M}altosyl {T}ransferase {G}lg{E} {B}inds $\alpha$-{M}altose
1-{P}hosphate and {F}orms a {M}altosyl-{E}nzyme
{I}ntermediate},
journal = {Biochemistry},
volume = {53},
number = {15},
issn = {1520-4995},
address = {Columbus, Ohio},
publisher = {American Chemical Society},
reportid = {PUBDB-2015-01352},
pages = {2494 - 2504},
year = {2014},
abstract = {GlgE (EC 2.4.99.16) is an α-maltose
1-phosphate:(1→4)-α- D -glucan 4-α- D
-maltosyltransferase of theCAZy glycoside hydrolase $13_3$
family. It is the definingenzyme of a bacterial α-glucan
biosynthetic pathway and is agenetically validated
anti-tuberculosis target. It catalyzes the α-retaining
transfer of maltosyl units from α-maltose 1-phosphate to
maltooligosaccharides and is predicted to use
adouble-displacement mechanism. Evidence of this
mechanismwas obtained using a combination of site-directed
mutagenesis of Streptomyces coelicolor GlgE isoform I,
substrate analogues,protein crystallography, and mass
spectrometry. The X-ray structures of α-maltose 1-phosphate
bound to a D394A mutein and
aβ-2-deoxy-2-fluoromaltosyl-enzyme intermediate with a
E423A mutein were determined. There are few examples of
CAZyglycoside hydrolase family 13 members that have had
their glycosyl-enzyme intermediate structures determined,
and none beforenow have been obtained with a
2-deoxy-2-fluoro substrate analogue. The covalent
modification of Asp394 was confirmed usingmass spectrometry.
A similar modification of wild-type GlgE proteins from S.
coelicolor and Mycobacterium tuberculosis was alsoobserved.
Small-angle X-ray scattering of the M. tuberculosis enzyme
revealed a homodimeric assembly similar to that of the
S.coelicolor enzyme but with slightly differently oriented
monomers. The deeper understanding of the
structure−functionrelationships of S. coelicolor GlgE will
aid the development of inhibitors of the M. tuberculosis
enzyme.},
cin = {EMBL},
ddc = {570},
cid = {I:(DE-H253)EMBL-20120731},
pnm = {DORIS Beamline D1.2 (POF2-54G13) / ELISA - European Light
Sources Activities - Synchrotrons and Free Electron Lasers
(226716)},
pid = {G:(DE-H253)POF2-D1.2-20130405 / G:(EU-Grant)226716},
experiment = {EXP:(DE-H253)D-D1.2-20150101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000334991100008},
pubmed = {pmid:24689960},
doi = {10.1021/bi500183c},
url = {https://bib-pubdb1.desy.de/record/207454},
}