1mg5
From Proteopedia
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'''Crystal structure of Drosophila melanogaster alcohol dehydrogenase complexed with NADH and acetate at 1.6 A''' | '''Crystal structure of Drosophila melanogaster alcohol dehydrogenase complexed with NADH and acetate at 1.6 A''' | ||
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[[Category: Gonzalez-Duarte, R.]] | [[Category: Gonzalez-Duarte, R.]] | ||
[[Category: Ladenstein, R.]] | [[Category: Ladenstein, R.]] | ||
| - | [[Category: | + | [[Category: Acetate]] |
| - | [[Category: | + | [[Category: Adh]] |
| - | [[Category: | + | [[Category: Drosophila melanogaster]] |
| - | [[Category: | + | [[Category: Nadh]] |
| - | [[Category: | + | [[Category: Sdr]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 00:59:36 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 21:59, 2 May 2008
Crystal structure of Drosophila melanogaster alcohol dehydrogenase complexed with NADH and acetate at 1.6 A
Overview
Drosophila alcohol dehydrogenase (DADH) is an NAD+-dependent enzyme that catalyzes the oxidation of alcohols to aldehydes/ketones and that is also able to further oxidize aldehydes to their corresponding carboxylic acids. The structure of the ternary enzyme-NADH-acetate complex of the slow alleloform of Drosophila melanogaster ADH (DmADH-S) was solved at 1.6 A resolution by X-ray crystallography. The coenzyme stereochemistry of the aldehyde dismutation reaction showed that the obtained enzyme-NADH-acetate complex reflects a productive ternary complex although no enzymatic reaction occurs. The stereochemistry of the acetate binding in the bifurcated substrate-binding site, along with previous stereochemical studies of aldehyde reduction and alcohol oxidation shows that the methyl group of the aldehyde in the reduction reaction binds to the R1 and in the oxidation reaction to the R2 sub-site. NMR studies along with previous kinetic studies show that the formed acetaldehyde intermediate in the oxidation of ethanol to acetate leaves the substrate site prior to the reduced coenzyme, and then binds to the newly formed enzyme-NAD+ complex. Here, we compare the three-dimensional structure of D.melanogaster ADH-S and a previous theoretically built model, evaluate the differences with the crystal structures of five Drosophila lebanonensis ADHs in numerous complexed forms that explain the substrate specificity as well as subtle kinetic differences between these two enzymes based on their crystal structures. We also re-examine the electrostatic influence of charged residues on the surface of the protein on the catalytic efficiency of the enzyme.
About this Structure
1MG5 is a Single protein structure of sequence from Drosophila melanogaster. Full crystallographic information is available from OCA.
Reference
Drosophila alcohol dehydrogenase: acetate-enzyme interactions and novel insights into the effects of electrostatics on catalysis., Benach J, Winberg JO, Svendsen JS, Atrian S, Gonzalez-Duarte R, Ladenstein R, J Mol Biol. 2005 Jan 21;345(3):579-98. PMID:15581900 Page seeded by OCA on Sat May 3 00:59:36 2008
