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1o00

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{{STRUCTURE_1o00| PDB=1o00 | SCENE= }}
{{STRUCTURE_1o00| PDB=1o00 | SCENE= }}
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'''Human mitochondrial aldehyde dehydrogenase complexed with NAD+ and Mg2+ showing dual NAD(H) conformations'''
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===Human mitochondrial aldehyde dehydrogenase complexed with NAD+ and Mg2+ showing dual NAD(H) conformations===
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==Overview==
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Crystal structures of many enzymes in the aldehyde dehydrogenase superfamily determined in the presence of bound NAD(P)(+) have exhibited conformational flexibility for the nicotinamide half of the cofactor. This has been hypothesized to be important in catalysis because one conformation would block the second half of the reaction, but no firm evidence has been put forth which shows whether the oxidized and reduced cofactors preferentially occupy the two observed conformations. We present here two structures of the wild type and two structures of a Cys302Ser mutant of human mitochondrial aldehyde dehydrogenase in binary complexes with NAD(+) and NADH. These structures, including the Cys302Ser mutant in complex with NAD(+) at 1.4 A resolution and the wild-type enzyme in complex with NADH at 1.9 A resolution, provide strong evidence that bound NAD(+) prefers an extended conformation ideal for hydride transfer and bound NADH prefers a contracted conformation ideal for acyl-enzyme hydrolysis. Unique interactions between the cofactor and the Rossmann fold make isomerization possible while allowing the remainder of the active site complex to remain intact. In addition, these structures clarify the role of magnesium in activating the human class 2 enzyme. Our data suggest that the presence of magnesium may lead to selection of particular conformations and speed isomerization of the reduced cofactor following hydride transfer.
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The line below this paragraph, {{ABSTRACT_PUBMED_12795606}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 12795606 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12795606}}
==About this Structure==
==About this Structure==
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[[Category: Nad]]
[[Category: Nad]]
[[Category: Nadh]]
[[Category: Nadh]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 03:11:49 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 14:04:03 2008''

Revision as of 11:04, 27 July 2008

Image:1o00.png

Template:STRUCTURE 1o00

Human mitochondrial aldehyde dehydrogenase complexed with NAD+ and Mg2+ showing dual NAD(H) conformations

Template:ABSTRACT PUBMED 12795606

About this Structure

1O00 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Coenzyme isomerization is integral to catalysis in aldehyde dehydrogenase., Perez-Miller SJ, Hurley TD, Biochemistry. 2003 Jun 17;42(23):7100-9. PMID:12795606

Page seeded by OCA on Sun Jul 27 14:04:03 2008

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