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9icd

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[[Image:9icd.gif|left|200px]]
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{{STRUCTURE_9icd| PDB=9icd | SCENE= }}
{{STRUCTURE_9icd| PDB=9icd | SCENE= }}
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'''CATALYTIC MECHANISM OF NADP+-DEPENDENT ISOCITRATE DEHYDROGENASE: IMPLICATIONS FROM THE STRUCTURES OF MAGNESIUM-ISOCITRATE AND NADP+ COMPLEXES'''
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===CATALYTIC MECHANISM OF NADP+-DEPENDENT ISOCITRATE DEHYDROGENASE: IMPLICATIONS FROM THE STRUCTURES OF MAGNESIUM-ISOCITRATE AND NADP+ COMPLEXES===
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==Overview==
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The structures of NADP+ and magnesium isocitrate bound to the NADP(+)-dependent isocitrate dehydrogenase of Escherichia coli have been determined and refined at 2.5-A resolution. NADP+ is bound by the large domain of isocitrate dehydrogenase, a structure that has little similarity to the supersecondary structure of the nucleotide-binding domain of the lactate dehydrogenase-like family of nucleotide-binding proteins. The coenzyme-binding site confirms the fundamentally different evolution of the isocitrate dehydrogenase-like and the lactate dehydrogenase-like classes of nucleotide-binding proteins. In the magnesium-isocitrate complex, magnesium is coordinated to the alpha-carboxylate and alpha-hydroxyl oxygen of isocitrate in a manner suitable for stabilization of a negative charge on the hydroxyl oxygen during both the dehydrogenation and decarboxylation steps of the conversion of isocitrate to alpha-ketoglutarate. The metal ion is also coordinated by aspartate side chains 283' (of the second subunit of the dimer) and 307 and two water molecules in a roughly octahedral arrangement. On the basis of the geometry of the active site, the base functioning in the dehydrogenation step is most likely aspartate 283'. E. coli isocitrate dehydrogenase transfers a hydride stereospecifically to the A-side of NADP+, and models for a reactive ternary complex consistent with this stereospecificity are discussed.
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{{ABSTRACT_PUBMED_1888729}}
==About this Structure==
==About this Structure==
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[[Category: Koshlandjunior, D E.]]
[[Category: Koshlandjunior, D E.]]
[[Category: Stroud, R M.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri Jul 11 12:50:00 2008''

Revision as of 09:50, 11 July 2008

Image:9icd.png

Template:STRUCTURE 9icd

CATALYTIC MECHANISM OF NADP+-DEPENDENT ISOCITRATE DEHYDROGENASE: IMPLICATIONS FROM THE STRUCTURES OF MAGNESIUM-ISOCITRATE AND NADP+ COMPLEXES

Template:ABSTRACT PUBMED 1888729

About this Structure

9ICD is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Catalytic mechanism of NADP(+)-dependent isocitrate dehydrogenase: implications from the structures of magnesium-isocitrate and NADP+ complexes., Hurley JH, Dean AM, Koshland DE Jr, Stroud RM, Biochemistry. 1991 Sep 3;30(35):8671-8. PMID:1888729

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