2va1: Difference between revisions
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==About this Structure== | ==About this Structure== | ||
2VA1 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Ureaplasma_parvum Ureaplasma parvum] with <scene name='pdbligand=PO4:'>PO4</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Known structural/functional Sites: <scene name='pdbsite=AC1:Po4 Binding Site For Chain A'>AC1</scene>, <scene name='pdbsite=AC2:Po4 Binding Site For Chain B'>AC2</scene>, <scene name='pdbsite=AC3:Po4 Binding Site For Chain C'>AC3</scene>, <scene name='pdbsite=AC4:Po4 Binding Site For Chain D'>AC4</scene>, <scene name='pdbsite=AC5:Po4 Binding Site For Chain E'>AC5</scene> and <scene name='pdbsite=AC6:Po4 Binding Site For Chain F'>AC6</scene>. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2VA1 OCA]. | 2VA1 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Ureaplasma_parvum Ureaplasma parvum] with <scene name='pdbligand=PO4:'>PO4</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Known structural/functional Sites: <scene name='pdbsite=AC1:Po4+Binding+Site+For+Chain+A'>AC1</scene>, <scene name='pdbsite=AC2:Po4+Binding+Site+For+Chain+B'>AC2</scene>, <scene name='pdbsite=AC3:Po4+Binding+Site+For+Chain+C'>AC3</scene>, <scene name='pdbsite=AC4:Po4+Binding+Site+For+Chain+D'>AC4</scene>, <scene name='pdbsite=AC5:Po4+Binding+Site+For+Chain+E'>AC5</scene> and <scene name='pdbsite=AC6:Po4+Binding+Site+For+Chain+F'>AC6</scene>. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2VA1 OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: uridylate kinase]] | [[Category: uridylate kinase]] | ||
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Revision as of 11:50, 3 February 2008
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CRYSTAL STRUCTURE OF UMP KINASE FROM UREAPLASMA PARVUM
OverviewOverview
The crystal structure of uridine monophosphate kinase (UMP kinase, UMPK), from the opportunistic pathogen Ureaplasma parvum was determined and, showed similar three-dimensional fold as other bacterial and archaeal, UMPKs that all belong to the amino acid kinase family. Recombinant UpUMPK, exhibited Michaelis-Menten kinetics with UMP, with K(m) and V(max) values, of 214 +/- 4 microm and 262 +/- 24 micromol.min(-1).mg(-1), respectively, but with ATP as variable substrate the kinetic analysis showed positive, cooperativity, with an n value of 1.5 +/- 0.1. The end-product UTP was a, competitive inhibitor against UMP and a noncompetitive inhibitor towards, ATP. Unlike UMPKs from other bacteria, which are activated by GTP, GTP had, no detectable effect on UpUMPK activity. An attempt to create a, GTP-activated enzyme was made using site-directed mutagenesis. The mutant, enzyme F133N (F133 corresponds to the residue in Escherichia coli that is, involved in GTP activation), with F133A as a control, were expressed, purified and characterized. Both enzymes exhibited negative cooperativity, with UMP, and GTP had no effect on enzyme activity, demonstrating that, F133 is involved in subunit interactions but apparently not in GTP, activation. The physiological role of UpUMPK in bacterial nucleic acid, synthesis and its potential as target for development of antimicrobial, agents are discussed.
About this StructureAbout this Structure
2VA1 is a Single protein structure of sequence from Ureaplasma parvum with as ligand. Known structural/functional Sites: , , , , and . Full crystallographic information is available from OCA.
ReferenceReference
Structural and functional investigations of Ureaplasma parvum UMP kinase - a potential antibacterial drug target., Egeblad-Welin L, Welin M, Wang L, Eriksson S, FEBS J. 2007 Dec;274(24):6403-14. Epub 2007 Nov 15. PMID:18021254
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