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2imp

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{{STRUCTURE_2imp| PDB=2imp | SCENE= }}
{{STRUCTURE_2imp| PDB=2imp | SCENE= }}
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'''Crystal structure of lactaldehyde dehydrogenase from E. coli: the ternary complex with product bound (L)-lactate and NADH.'''
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===Crystal structure of lactaldehyde dehydrogenase from E. coli: the ternary complex with product bound (L)-lactate and NADH.===
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==Overview==
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Aldehyde dehydrogenases catalyze the oxidation of aldehyde substrates to the corresponding carboxylic acids. Lactaldehyde dehydrogenase from Escherichia coli (aldA gene product, P25553) is an NAD(+)-dependent enzyme implicated in the metabolism of l-fucose and l-rhamnose. During the heterologous expression and purification of taxadiene synthase from the Pacific yew, lactaldehyde dehydrogenase from E. coli was identified as a minor (&lt;/=5%) side-product subsequent to its unexpected crystallization. Accordingly, we now report the serendipitous crystal structure determination of unliganded lactaldehyde dehydrogenase from E. coli determined by the technique of multiple isomorphous replacement using anomalous scattering at 2.2 A resolution. Additionally, we report the crystal structure of the ternary enzyme complex with products lactate and NADH at 2.1 A resolution, and the crystal structure of the enzyme complex with NADPH at 2.7 A resolution. The structure of the ternary complex reveals that the nicotinamide ring of the cofactor is disordered between two conformations: one with the ring positioned in the active site in the so-called hydrolysis conformation, and another with the ring extended out of the active site into the solvent region, designated the out conformation. This represents the first crystal structure of an aldehyde dehydrogenase-product complex. The active site pocket in which lactate binds is more constricted than that of medium-chain dehydrogenases such as the YdcW gene product of E. coli. The structure of the binary complex with NADPH reveals the first view of the structural basis of specificity for NADH: the negatively charged carboxylate group of E179 destabilizes the binding of the 2'-phosphate group of NADPH sterically and electrostatically, thereby accounting for the lack of enzyme activity with this cofactor.
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(as it appears on PubMed at http://www.pubmed.gov), where 17173928 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17173928}}
==About this Structure==
==About this Structure==
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[[Category: Gomez, G A.]]
[[Category: Gomez, G A.]]
[[Category: Protein-lactate-nadh ternary complex]]
[[Category: Protein-lactate-nadh ternary complex]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 07:40:04 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 00:26:53 2008''

Revision as of 21:26, 28 July 2008

Image:2imp.png

Template:STRUCTURE 2imp

Crystal structure of lactaldehyde dehydrogenase from E. coli: the ternary complex with product bound (L)-lactate and NADH.

Template:ABSTRACT PUBMED 17173928

About this Structure

2IMP is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Crystal structure of lactaldehyde dehydrogenase from Escherichia coli and inferences regarding substrate and cofactor specificity., Di Costanzo L, Gomez GA, Christianson DW, J Mol Biol. 2007 Feb 16;366(2):481-93. Epub 2006 Nov 10. PMID:17173928

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