1lqt

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{{STRUCTURE_1lqt| PDB=1lqt | SCENE= }}
{{STRUCTURE_1lqt| PDB=1lqt | SCENE= }}
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'''A covalent modification of NADP+ revealed by the atomic resolution structure of FprA, a Mycobacterium tuberculosis oxidoreductase'''
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===A covalent modification of NADP+ revealed by the atomic resolution structure of FprA, a Mycobacterium tuberculosis oxidoreductase===
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==Overview==
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FprA is a mycobacterial oxidoreductase that catalyzes the transfer of reducing equivalents from NADPH to a protein acceptor. We determined the atomic resolution structure of FprA in the oxidized (1.05 A resolution) and NADPH-reduced (1.25 A resolution) forms. The comparison of these FprA structures with that of bovine adrenodoxin reductase showed no significant overall differences. Hence, these enzymes, which belong to the structural family of the disulfide oxidoreductases, are structurally conserved in very distant organisms such as mycobacteria and mammals. Despite the conservation of the overall fold, the details of the active site of FprA show some peculiar features. In the oxidized enzyme complex, the bound NADP+ exhibits a covalent modification, which has been identified as an oxygen atom linked through a carbonylic bond to the reactive C4 atom of the nicotinamide ring. Mass spectrometry has confirmed this assignment. This NADP+ derivative is likely to form by oxidation of the NADP+ adduct resulting from nucleophilic attack by an active-site water molecule. A Glu-His pair is well positioned to activate the attacking water through a mechanism analogous to that of the catalytic triad in serine proteases. The NADP+ nicotinamide ring exhibits the unusual cis conformation, which may favor derivative formation. The physiological significance of this reaction is presently unknown. However, it could assist with drug-design studies in that the modified NADP+ could serve as a lead compound for the development of specific inhibitors.
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(as it appears on PubMed at http://www.pubmed.gov), where 12102623 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12102623}}
==About this Structure==
==About this Structure==
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[[Category: Tbsgc]]
[[Category: Tbsgc]]
[[Category: Tuberculosis]]
[[Category: Tuberculosis]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 00:11:29 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 21:49:26 2008''

Revision as of 18:49, 2 July 2008

Image:1lqt.png

Template:STRUCTURE 1lqt

A covalent modification of NADP+ revealed by the atomic resolution structure of FprA, a Mycobacterium tuberculosis oxidoreductase

Template:ABSTRACT PUBMED 12102623

About this Structure

1LQT is a Single protein structure of sequence from Mycobacterium tuberculosis. Full crystallographic information is available from OCA.

Reference

A covalent modification of NADP+ revealed by the atomic resolution structure of FprA, a Mycobacterium tuberculosis oxidoreductase., Bossi RT, Aliverti A, Raimondi D, Fischer F, Zanetti G, Ferrari D, Tahallah N, Maier CS, Heck AJ, Rizzi M, Mattevi A, Biochemistry. 2002 Jul 16;41(28):8807-18. PMID:12102623

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