1h3d

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[[Image:1h3d.gif|left|200px]]
[[Image:1h3d.gif|left|200px]]
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{{Structure
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<!--
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|PDB= 1h3d |SIZE=350|CAPTION= <scene name='initialview01'>1h3d</scene>, resolution 2.7&Aring;
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The line below this paragraph, containing "STRUCTURE_1h3d", creates the "Structure Box" on the page.
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|SITE= <scene name='pdbsite=AMP:Tla+Binding+Site+For+Chain+A'>AMP</scene>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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|LIGAND= <scene name='pdbligand=AMP:ADENOSINE+MONOPHOSPHATE'>AMP</scene>, <scene name='pdbligand=TLA:L(+)-TARTARIC+ACID'>TLA</scene>
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/ATP_phosphoribosyltransferase ATP phosphoribosyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.2.17 2.4.2.17] </span>
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or leave the SCENE parameter empty for the default display.
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|GENE=
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-->
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|DOMAIN=
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{{STRUCTURE_1h3d| PDB=1h3d | SCENE= }}
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|RELATEDENTRY=
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1h3d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1h3d OCA], [http://www.ebi.ac.uk/pdbsum/1h3d PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1h3d RCSB]</span>
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}}
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'''STRUCTURE OF THE E.COLI ATP-PHOSPHORIBOSYLTRANSFERASE'''
'''STRUCTURE OF THE E.COLI ATP-PHOSPHORIBOSYLTRANSFERASE'''
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[[Category: Lohkamp, B.]]
[[Category: Lohkamp, B.]]
[[Category: Mcdermott, G.]]
[[Category: Mcdermott, G.]]
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[[Category: glycosyltransferase]]
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[[Category: Glycosyltransferase]]
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[[Category: hisitidine biosynthesis]]
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[[Category: Hisitidine biosynthesis]]
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[[Category: phosphoribosyltransferase]]
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[[Category: Phosphoribosyltransferase]]
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[[Category: transferase]]
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[[Category: Transferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 18:22:50 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 20:56:50 2008''
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Revision as of 15:22, 2 May 2008

Image:1h3d.gif

Template:STRUCTURE 1h3d

STRUCTURE OF THE E.COLI ATP-PHOSPHORIBOSYLTRANSFERASE


Overview

ATP-phosphoribosyltransferase (ATP-PRT), the first enzyme of the histidine pathway, is a complex allosterically regulated enzyme, which controls the flow of intermediates through this biosynthetic pathway. The crystal structures of Escherichia coli ATP-PRT have been solved in complex with the inhibitor AMP at 2.7A and with product PR-ATP at 2.9A (the ribosyl-triphosphate could not be resolved). On the basis of binding of AMP and PR-ATP and comparison with type I PRTs, the PRPP and parts of the ATP-binding site are identified. These structures clearly identify the AMP as binding in the 5-phosphoribosyl-alpha-1-pyrophosphate (PRPP)-binding site, with the adenosine ring occupying the ATP-binding site. Comparison with the recently solved Mycobacterium tuberculosis ATP-PRT structures indicates that histidine is solely responsible for the large conformational changes observed between the hexameric forms of the enzyme. The role of oligomerisation in inhibition and the structural basis for the synergistic inhibition by histidine and AMP are discussed.

About this Structure

1H3D is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

The structure of Escherichia coli ATP-phosphoribosyltransferase: identification of substrate binding sites and mode of AMP inhibition., Lohkamp B, McDermott G, Campbell SA, Coggins JR, Lapthorn AJ, J Mol Biol. 2004 Feb 6;336(1):131-44. PMID:14741209 Page seeded by OCA on Fri May 2 18:22:50 2008

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