1gve: Difference between revisions

The structure of the rat liver aflatoxin dialdehyde reductase (AKR7A1) has, been solved to 1.38-A resolution. Although it shares a similar, alpha/beta-barrel structure with other members of the aldo-keto reductase, superfamily, AKR7A1 is the first dimeric member to be crystallized. The, crystal structure also reveals details of the ternary complex as one, subunit of the dimer contains NADP(+) and the inhibitor citrate. Although, the underlying catalytic mechanism appears similar to other aldo-keto, reductases, the substrate-binding pocket contains several charged amino, acids (Arg-231 and Arg-327) that distinguish it from previously, characterized aldo-keto reductases with respect to size and charge. These, differences account for the substrate specificity for 4-carbon, acid-aldehydes such as succinic semialdehyde and 2-carboxybenzaldehyde as, well as for the idiosyncratic substrate aflatoxin B(1) dialdehyde of this, subfamily of enzymes. Structural differences between the AKR7A1 ternary, complex and apoenzyme reveal a significant hinged movement of the enzyme, involving not only the loops of the structure but also parts of the, alpha/beta-barrel most intimately involved in cofactor binding.

1GVE is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus] with NAP, CIT and GOL as [http://en.wikipedia.org/wiki/ligands ligands]. Structure known Active Site: AC1. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1GVE OCA].  

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