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1nsk

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{{STRUCTURE_1nsk| PDB=1nsk | SCENE= }}
{{STRUCTURE_1nsk| PDB=1nsk | SCENE= }}
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'''THE CRYSTAL STRUCTURE OF A HUMAN NUCLEOSIDE DIPHOSPHATE KINASE, NM23-H2'''
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===THE CRYSTAL STRUCTURE OF A HUMAN NUCLEOSIDE DIPHOSPHATE KINASE, NM23-H2===
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==Overview==
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The 2.8 A resolution X-ray structure of NM23-H2 has been determined by molecular replacement using the structure of Myxococcus xanthus nucleoside diphosphate (NDP) kinase. NM23-H2 is a human NDP kinase. The enzyme catalyses phosphoryl transfer, binds DNA, and can activate the transcription of the c-myc oncogene in vitro. NM23 has also been reported to be a suppressor of metastasis in some types of tumours. Whereas the M. xanthus NDP kinase is a tetramer, NM23-H2 is a hexamer. The fold of NM23-H2 is identical to the fold of other NDP kinases. Two antiparallel helices joined by a turn form one edge of the nucleotide binding cleft. This region moves in a hinge-like fashion in response to substrate binding and crystal packing forces. Additional differences in conformation among the NDP kinases are principally in regions involved in protein-protein contacts within the oligomers. The only protein-protein interaction conserved among all NDP kinases is a dimeric interaction. Several mutations of NM23-H2 have been detected in tumour tissues. These mutations do not involve residues interacting with the substrates, and probably destabilise the enzyme without directly affecting the catalytic activity. Low level phosphorylation of serines has been reported for NM23 both in vitro and in vivo. The structure of the hexamer indicates that two serine residues that have been reported as being phosphorylated, Ser44 and Ser122, are on the surface of the hexamer, and are likely to be phosphorylated by exogenous kinases. In contrast, Ser120 is buried, and is most likely phosphorylated by a direct transfer from the phosphohistidine intermediate of the reaction mechanism.
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(as it appears on PubMed at http://www.pubmed.gov), where 7658474 is the PubMed ID number.
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{{ABSTRACT_PUBMED_7658474}}
==About this Structure==
==About this Structure==
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[[Category: Perisic, O.]]
[[Category: Perisic, O.]]
[[Category: Williams, R L.]]
[[Category: Williams, R L.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 02:55:46 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 06:46:44 2008''

Revision as of 03:46, 28 July 2008

Image:1nsk.png

Template:STRUCTURE 1nsk

THE CRYSTAL STRUCTURE OF A HUMAN NUCLEOSIDE DIPHOSPHATE KINASE, NM23-H2

Template:ABSTRACT PUBMED 7658474

About this Structure

1NSK is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

The crystal structure of a human nucleoside diphosphate kinase, NM23-H2., Webb PA, Perisic O, Mendola CE, Backer JM, Williams RL, J Mol Biol. 1995 Aug 25;251(4):574-87. PMID:7658474

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