1kku

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{{STRUCTURE_1kku| PDB=1kku | SCENE= }}
{{STRUCTURE_1kku| PDB=1kku | SCENE= }}
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'''Crystal structure of nuclear human nicotinamide mononucleotide adenylyltransferase'''
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===Crystal structure of nuclear human nicotinamide mononucleotide adenylyltransferase===
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==Overview==
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Nicotinamide mononucleotide adenylyltransferase (NMNAT), a member of the nucleotidyltransferase alpha/beta-phosphodiesterases superfamily, catalyzes a universal step (NMN + ATP = NAD + PP(i)) in NAD biosynthesis. Localized within the nucleus, the activity of the human enzyme is greatly altered in tumor cells, rendering it a promising target for cancer chemotherapy. By using a combination of single isomorphous replacement and density modification techniques, the human NMNAT structure was solved by x-ray crystallography to a 2.5-A resolution, revealing a hexamer that is composed of alpha/beta-topology subunits. The active site topology of the enzyme, analyzed through homology modeling and structural comparison with other NMNATs, yielded convincing evidence for a substrate-induced conformational change. We also observed remarkable structural conservation in the ATP-recognition motifs GXXXPX(T/H)XXH and SXTXXR, which we take to be the universal signature for NMNATs. Structural comparison of human and prokaryotic NMNATs may also lead to the rational design of highly selective antimicrobial drugs.
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(as it appears on PubMed at http://www.pubmed.gov), where 11751893 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11751893}}
==About this Structure==
==About this Structure==
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[[Category: Rizzi, M.]]
[[Category: Rizzi, M.]]
[[Category: Alpha/beta structure - rossmann fold]]
[[Category: Alpha/beta structure - rossmann fold]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 22:51:48 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 10:29:26 2008''

Revision as of 07:29, 2 July 2008

Image:1kku.png

Template:STRUCTURE 1kku

Crystal structure of nuclear human nicotinamide mononucleotide adenylyltransferase

Template:ABSTRACT PUBMED 11751893

About this Structure

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

Reference

Structure of human NMN adenylyltransferase. A key nuclear enzyme for NAD homeostasis., Garavaglia S, D'Angelo I, Emanuelli M, Carnevali F, Pierella F, Magni G, Rizzi M, J Biol Chem. 2002 Mar 8;277(10):8524-30. Epub 2001 Dec 19. PMID:11751893

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