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[[Image:1dea.jpg|left|200px]]
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{{STRUCTURE_1dea|  PDB=1dea  |  SCENE=  }}  
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'''STRUCTURE AND CATALYTIC MECHANISM OF GLUCOSAMINE 6-PHOSPHATE DEAMINASE FROM ESCHERICHIA COLI AT 2.1 ANGSTROMS RESOLUTION'''
===STRUCTURE AND CATALYTIC MECHANISM OF GLUCOSAMINE 6-PHOSPHATE DEAMINASE FROM ESCHERICHIA COLI AT 2.1 ANGSTROMS RESOLUTION===




==Overview==
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BACKGROUND: Glucosamine 6-phosphate deaminase from Escherichia coli is an allosteric hexameric enzyme which catalyzes the reversible conversion of D-glucosamine 6-phosphate into D-fructose 6-phosphate and ammonium ion and is activated by N-acetyl-D-glucosamine 6-phosphate. Mechanistically, it belongs to the group of aldoseketose isomerases, but its reaction also accomplishes a simultaneous amination/deamination. The determination of the structure of this protein provides fundamental knowledge for understanding its mode of action and the nature of allosteric conformational changes that regulate its function. RESULTS: The crystal structure of glucosamine 6-phosphate deaminase with bound phosphate ions is presented at 2.1 A resolution together with the refined structures of the enzyme in complexes with its allosteric activator and with a competitive inhibitor. The protein fold can be described as a modified NAD-binding domain. CONCLUSIONS: From the similarities between the three presented structures, it is concluded that these represent the enzymatically active R state conformer. A mechanism for the deaminase reaction is proposed. It comprises steps to open the pyranose ring of the substrate and a sequence of general base-catalyzed reactions to bring about isomerization and deamination, with Asp72 playing a key role as a proton exchanger.
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{{ABSTRACT_PUBMED_8747459}}


==About this Structure==
==About this Structure==
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[[Category: Oliva, G.]]
[[Category: Oliva, G.]]
[[Category: Intramolecular oxidoreductase deaminase]]
[[Category: Intramolecular oxidoreductase deaminase]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 13:45:17 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 22:53:44 2008''

Revision as of 19:53, 30 June 2008

File:1dea.png

Template:STRUCTURE 1dea

STRUCTURE AND CATALYTIC MECHANISM OF GLUCOSAMINE 6-PHOSPHATE DEAMINASE FROM ESCHERICHIA COLI AT 2.1 ANGSTROMS RESOLUTION

Template:ABSTRACT PUBMED 8747459

About this Structure

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

Reference

Structure and catalytic mechanism of glucosamine 6-phosphate deaminase from Escherichia coli at 2.1 A resolution., Oliva G, Fontes MR, Garratt RC, Altamirano MM, Calcagno ML, Horjales E, Structure. 1995 Dec 15;3(12):1323-32. PMID:8747459

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