1kku
From Proteopedia
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==Overview== | ==Overview== | ||
| - | Nicotinamide mononucleotide adenylyltransferase (NMNAT), a member of the | + | 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. |
==About this Structure== | ==About this Structure== | ||
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[[Category: Nicotinamide-nucleotide adenylyltransferase]] | [[Category: Nicotinamide-nucleotide adenylyltransferase]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Angelo, I | + | [[Category: Angelo, I D.]] |
[[Category: Carnevali, F.]] | [[Category: Carnevali, F.]] | ||
[[Category: Emanuelli, M.]] | [[Category: Emanuelli, M.]] | ||
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[[Category: alpha/beta structure - rossmann fold]] | [[Category: alpha/beta structure - rossmann fold]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:35:15 2008'' |
Revision as of 11:35, 21 February 2008
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Crystal structure of nuclear human nicotinamide mononucleotide adenylyltransferase
Overview
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.
About this Structure
1KKU is a Single protein structure of sequence from Homo sapiens. Active as Nicotinamide-nucleotide adenylyltransferase, with EC number 2.7.7.1 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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