PDBsum entry 1ae4

Oxidoreductase

PDB id: 1ae4

Contents

Protein chain

324 a.a.*

Ligands

NAP

TOL

* C-alpha coords only

References listed in PDB file

Key reference

• Title: Studies on the inhibitor-Binding site of porcine aldehyde reductase: crystal structure of the holoenzyme-Inhibitor ternary complex.
• Authors: O.El-Kabbani, D.A.Carper, M.H.Mcgowan, Y.Devedjiev, K.J.Rees-Milton, T.G.Flynn.
• Ref.: Proteins, 1997, 29, 186-192.
• PubMed id: 9329083

Abstract

Aldehyde reductase is an enzyme capable of metabolizing a wide variety of aldehydes to their corresponding alcohols. The tertiary structures of aldehyde reductase and aldose reductase are similar and consist of an alpha/beta-barrel with the active site located at the carboxy terminus of the strands of the barrel. We have determined the X-ray crystal structure of porcine aldehyde reductase holoenzyme in complex with an aldose reductase inhibitor, tolrestat, at 2.4 A resolution to obtain a picture of the binding conformation of inhibitors to aldehyde reductase. Tolrestat binds in the active site pocket of aldehyde reductase and interacts through van der Waals contacts with Arg 312 and Asp 313. The carboxylate group of tolrestat is within hydrogen bonding distance with His 113 and Trp 114. Mutation of Arg 312 to alanine in porcine aldehyde reductase alters the potency of inhibition of the enzyme by aldose reductase inhibitors. Our results indicate that the structure of the inhibitor-binding site of aldehyde reductase differs from that of aldose reductase due to the participation of nonconserved residues in its formation. A major difference is the participation of Arg 312 and Asp 313 in lining the inhibitor-binding site in aldehyde reductase but not in aldose reductase.

Secondary reference #1

• Title: Structure of porcine aldehyde reductase holoenzyme.
• Authors: O.El-Kabbani, K.Judge, S.L.Ginell, D.A.Myles, L.J.Delucas, T.G.Flynn.
• Ref.: Nat Struct Biol, 1995, 2, 687-692.
• PubMed id: 7552731