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2h0r

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{{STRUCTURE_2h0r| PDB=2h0r | SCENE= }}
{{STRUCTURE_2h0r| PDB=2h0r | SCENE= }}
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'''Structure of the Yeast Nicotinamidase Pnc1p'''
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===Structure of the Yeast Nicotinamidase Pnc1p===
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==Overview==
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The yeast nicotinamidase Pnc1p acts in transcriptional silencing by reducing levels of nicotinamide, an inhibitor of the histone deacetylase Sir2p. The Pnc1p structure was determined at 2.9A resolution using MAD and MIRAS phasing methods after inadvertent crystallization during the pursuit of the structure of histidine-tagged yeast isocitrate dehydrogenase (IDH). Pnc1p displays a cluster of surface histidine residues likely responsible for its co-fractionation with IDH from Ni(2+)-coupled chromatography resins. Researchers expressing histidine-tagged proteins in yeast should be aware of the propensity of Pnc1p to crystallize, even when overwhelmed in concentration by the protein of interest. The protein assembles into extended helical arrays interwoven to form an unusually robust, yet porous superstructure. Comparison of the Pnc1p structure with those of three homologous bacterial proteins reveals a common core fold punctuated by amino acid insertions unique to each protein. These insertions mediate the self-interactions that define the distinct higher order oligomeric states attained by these molecules. Pnc1p also acts on pyrazinamide, a substrate analog converted by the nicotinamidase from Mycobacterium tuberculosis into a product toxic to that organism. However, we find no evidence for detrimental effects of the drug on yeast cell growth.
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(as it appears on PubMed at http://www.pubmed.gov), where 17382284 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17382284}}
==About this Structure==
==About this Structure==
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[[Category: Nad+ salvage pathway]]
[[Category: Nad+ salvage pathway]]
[[Category: Nicotinamidase]]
[[Category: Nicotinamidase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 05:44:00 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 05:07:24 2008''

Revision as of 02:07, 29 July 2008

Image:2h0r.png

Template:STRUCTURE 2h0r

Structure of the Yeast Nicotinamidase Pnc1p

Template:ABSTRACT PUBMED 17382284

About this Structure

2H0R is a Single protein structure of sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.

Reference

Crystal structure of the yeast nicotinamidase Pnc1p., Hu G, Taylor AB, McAlister-Henn L, Hart PJ, Arch Biochem Biophys. 2007 May 1;461(1):66-75. Epub 2007 Mar 2. PMID:17382284

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