The pyruvate dehydrogenase complex of Mycoplasma hyopneumoniae contains a novel lipoyl domain arrangement

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Show simple item record Matic, JN Wilton, JL Towers, RJ Scarmann, AL Minion, F Walker, M Djordjevic, SP 2010-05-28T09:44:41Z 2003-01
dc.identifier.citation Gene, 2003, 319 pp. 99 - 106
dc.identifier.issn 0378-1119
dc.identifier.other C1UNSUBMIT en_US
dc.description.abstract The genes encoding the pyruvate dehydrogenase (PDH) complex (pdhA, pdhB, pdhC and pdhD) from Mycoplasma hyopneumoniae have been cloned and sequenced. The genes are arranged into two operons, designated pdhAB and pdhCD, which are not found together in the chromosome. The pdhA, pdhB, pdhC and pdhD genes encode proteins of predicted molecular masses of 44.2 kDa (pyruvate dehydrogenase major subunit; E1?), 36.6 kDa (pyruvate dehydrogenase minor subunit; E1?), 33.1 kDa (dihydrolipoyl acetyltransferase; E2) and 66.3 kDa (dihydrolipoyl dehydrogenase; E3), respectively. Sequence analysis of the pdhCD operon revealed the presence of a lipoyl-binding domain in pdhD but not in pdhC. The lipoyl domain is believed to act as a swinging arm that spans the gaps between the catalytic domains of each of the subunits. Portions of the N-terminal regions of pdhA and pdhD were expressed as 6×His-tag fusion proteins in Escherichia coli and purified by nickel affinity chromatography. The purified proteins were used to raise antibodies in rabbits, and Western blot analysis was performed with the polyclonal rabbit antiserum. Both the pdhA and pdhD genes were expressed among various strains of M. hyopneumoniae as well as the porcine mycoplasmas, Mycoplasma hyorhinis and Mycoplasma flocculare. Southern hybridisation analysis using probes from pdhA and pdhD detected one copy of each gene in the chromosome of M. hyopneumoniae. Since previous studies have shown pyruvate dehydrogenase activity in M. hyopneumoniae [J. Gen. Microbiol. 134 (1988) 791], it appears likely that a functional lipoyl-binding domain in the N terminus of PdhC is not an absolute prerequisite for pyruvate dehydrogenase enzyme activity. We hypothesise that the lipoyl-binding domain of PdhD is performing the enzymatic function normally attributed to the PdhC lipoyl-binding domain in other organisms.
dc.publisher Elsevier Inc
dc.relation.isbasedon 10.1016/S0378-1119(03)00798-4
dc.title The pyruvate dehydrogenase complex of Mycoplasma hyopneumoniae contains a novel lipoyl domain arrangement
dc.type Journal Article
dc.parent Gene
dc.journal.volume 319
dc.journal.number en_US
dc.publocation Amsterdam, Netherlands en_US
dc.identifier.startpage 99 en_US
dc.identifier.endpage 106 en_US SCI.Institute for Biotechnology of Infectious Diseases en_US
dc.conference Verified OK en_US
dc.for 0604 Genetics
dc.personcode 107126
dc.percentage 100 en_US Genetics en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US
dc.location.activity en_US
dc.description.keywords Mycoplasma hyopneumoniae
dc.description.keywords Pyruvate dehydrogenase
dc.description.keywords Lipoyl domain
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - i3
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10
pubs.consider-herdc false
utslib.collection.history Closed (ID: 3)

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