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1fwk

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{{STRUCTURE_1fwk| PDB=1fwk | SCENE= }}
{{STRUCTURE_1fwk| PDB=1fwk | SCENE= }}
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'''CRYSTAL STRUCTURE OF HOMOSERINE KINASE COMPLEXED WITH ADP'''
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===CRYSTAL STRUCTURE OF HOMOSERINE KINASE COMPLEXED WITH ADP===
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==Overview==
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BACKGROUND: Homoserine kinase (HSK) catalyzes an important step in the threonine biosynthesis pathway. It belongs to a large yet unique class of small metabolite kinases, the GHMP kinase superfamily. Members in the GHMP superfamily participate in several essential metabolic pathways, such as amino acid biosynthesis, galactose metabolism, and the mevalonate pathway. RESULTS: The crystal structure of HSK and its complex with ADP reveal a novel nucleotide binding fold. The N-terminal domain contains an unusual left-handed betaalphabeta unit, while the C-terminal domain has a central alpha-beta plait fold with an insertion of four helices. The phosphate binding loop in HSK is distinct from the classical P loops found in many ATP/GTP binding proteins. The bound ADP molecule adopts a rare syn conformation and is in the opposite orientation from those bound to the P loop-containing proteins. Inspection of the substrate binding cavity indicates several amino acid residues that are likely to be involved in substrate binding and catalysis. CONCLUSIONS: The crystal structure of HSK is the first representative in the GHMP superfamily to have determined structure. It provides insight into the structure and nucleotide binding mechanism of not only the HSK family but also a variety of enzymes in the GHMP superfamily. Such enzymes include galactokinases, mevalonate kinases, phosphomevalonate kinases, mevalonate pyrophosphate decarboxylases, and several proteins of yet unknown functions.
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(as it appears on PubMed at http://www.pubmed.gov), where 11188689 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11188689}}
==About this Structure==
==About this Structure==
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[[Category: Zhou, T.]]
[[Category: Zhou, T.]]
[[Category: Kinase]]
[[Category: Kinase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 04:03:08 2008''

Revision as of 01:03, 1 July 2008

Image:1fwk.png

Template:STRUCTURE 1fwk

CRYSTAL STRUCTURE OF HOMOSERINE KINASE COMPLEXED WITH ADP

Template:ABSTRACT PUBMED 11188689

About this Structure

1FWK is a Single protein structure of sequence from Methanocaldococcus jannaschii. Full crystallographic information is available from OCA.

Reference

Structure and mechanism of homoserine kinase: prototype for the GHMP kinase superfamily., Zhou T, Daugherty M, Grishin NV, Osterman AL, Zhang H, Structure. 2000 Dec 15;8(12):1247-57. PMID:11188689

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