1nh7

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{{STRUCTURE_1nh7| PDB=1nh7 | SCENE= }}
{{STRUCTURE_1nh7| PDB=1nh7 | SCENE= }}
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'''ATP PHOSPHORIBOSYLTRANSFERASE (ATP-PRTASE) FROM MYCOBACTERIUM TUBERCULOSIS'''
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===ATP PHOSPHORIBOSYLTRANSFERASE (ATP-PRTASE) FROM MYCOBACTERIUM TUBERCULOSIS===
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==Overview==
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The N-1-(5'-phosphoribosyl)-ATP transferase catalyzes the first step of the histidine biosynthetic pathway and is regulated by a feedback mechanism by the product histidine. The crystal structures of the N-1-(5'-phosphoribosyl)-ATP transferase from Mycobacterium tuberculosis in complex with inhibitor histidine and AMP has been determined to 1.8 A resolution and without ligands to 2.7 A resolution. The active enzyme exists primarily as a dimer, and the histidine-inhibited form is a hexamer. The structure represents a new fold for a phosphoribosyltransferase, consisting of three continuous domains. The inhibitor AMP binds in the active site cavity formed between the two catalytic domains. A model for the mechanism of allosteric inhibition has been derived from conformational differences between the AMP:His-bound and apo structures.
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(as it appears on PubMed at http://www.pubmed.gov), where 12511575 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12511575}}
==About this Structure==
==About this Structure==
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[[Category: Tbsgc]]
[[Category: Tbsgc]]
[[Category: Transferase]]
[[Category: Transferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 02:31:37 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 18:30:12 2008''

Revision as of 15:30, 28 July 2008

Image:1nh7.gif

Template:STRUCTURE 1nh7

ATP PHOSPHORIBOSYLTRANSFERASE (ATP-PRTASE) FROM MYCOBACTERIUM TUBERCULOSIS

Template:ABSTRACT PUBMED 12511575

About this Structure

1NH7 is a Single protein structure of sequence from Mycobacterium tuberculosis. Full crystallographic information is available from OCA.

Reference

Crystal structure of ATP phosphoribosyltransferase from Mycobacterium tuberculosis., Cho Y, Sharma V, Sacchettini JC, J Biol Chem. 2003 Mar 7;278(10):8333-9. Epub 2003 Jan 2. PMID:12511575

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