2brx

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{{STRUCTURE_2brx| PDB=2brx | SCENE= }}
{{STRUCTURE_2brx| PDB=2brx | SCENE= }}
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'''UMP KINASE FROM PYROCOCCUS FURIOSUS WITHOUT LIGANDS'''
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===UMP KINASE FROM PYROCOCCUS FURIOSUS WITHOUT LIGANDS===
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==Overview==
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UMP kinase (UMPK), the enzyme responsible for microbial UMP phosphorylation, plays a key role in pyrimidine nucleotide biosynthesis, regulating this process via feed-back control and via gene repression of carbamoyl phosphate synthetase (the first enzyme of the pyrimidine biosynthesis pathway). We present crystal structures of Pyrococcus furiosus UMPK, free or complexed with AMPPNP or AMPPNP and UMP, at 2.4 A, 3 A and 2.55 A resolution, respectively, providing a true snapshot of the catalytically competent bisubstrate complex. The structure proves that UMPK does not resemble other nucleoside monophosphate kinases, including the UMP/CMP kinase found in animals, and thus UMPK may be a potential antimicrobial target. This enzyme has a homohexameric architecture centred around a hollow nucleus, and is organized as a trimer of dimers. The UMPK polypeptide exhibits the amino acid kinase family (AAKF) fold that has been reported in carbamate kinase and acetylglutamate kinase. Comparison with acetylglutamate kinase reveals that the substrates bind within each subunit at equivalent, adequately adapted sites. The UMPK structure contains two bound Mg ions, of which one helps stabilize the transition state, thus having the same catalytic role as one lysine residue found in acetylglutamate kinase, which is missing from P.furiosus UMPK. Relative to carbamate kinase and acetylglutamate kinase, UMPK presents a radically different dimer architecture, lacking the characteristic 16-stranded beta-sheet backbone that was considered a signature of AAKF enzymes. Its hexameric architecture, also a novel trait, results from equatorial contacts between the A and B subunits of adjacent dimers combined with polar contacts between A or B subunits, and may be required for the UMPK regulatory functions, such as gene regulation, proposed here to be mediated by hexamer-hexamer interactions with the DNA-binding protein PepA.
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==About this Structure==
==About this Structure==
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[[Category: Transferase]]
[[Category: Transferase]]
[[Category: Ump kinase]]
[[Category: Ump kinase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 23:54:17 2008''

Revision as of 20:54, 27 July 2008

Image:2brx.png

Template:STRUCTURE 2brx

UMP KINASE FROM PYROCOCCUS FURIOSUS WITHOUT LIGANDS

Template:ABSTRACT PUBMED 16095620

About this Structure

2BRX is a Single protein structure of sequence from Pyrococcus furiosus. Full crystallographic information is available from OCA.

Reference

The crystal structure of Pyrococcus furiosus UMP kinase provides insight into catalysis and regulation in microbial pyrimidine nucleotide biosynthesis., Marco-Marin C, Gil-Ortiz F, Rubio V, J Mol Biol. 2005 Sep 16;352(2):438-54. PMID:16095620

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