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Aldo-keto reductase: Wikis

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Aldo/keto reductase family
Aldose reductase 1us0.png
Ribbon diagram of human aldose reductase in complex with NADP+, citrate, and IDD594, a small molecule inhibitor. From PDB 1us0.
Identifiers
Symbol Aldo_ket_red
Pfam PF00248
InterPro IPR001395
PROSITE PDOC00061
SCOP 1ads

The aldo-keto reductase family is a family of enzymes that includes a number of related monomeric NADPH-dependent oxidoreductases, such as aldehyde reductase, aldose reductase, prostaglandin F synthase, xylose reductase, rho crystallin, and many others.[1]

Structure

All possess a similar structure, with a beta-alpha-beta fold characteristic of nucleotide binding proteins.[2] The fold comprises a parallel beta-8/alpha-8-barrel, which contains a novel NADP-binding motif. The binding site is located in a large, deep, elliptical pocket in the C-terminal end of the beta sheet, the substrate being bound in an extended conformation. The hydrophobic nature of the pocket favours aromatic and apolar substrates over highly polar ones.[3]

Binding of the NADPH coenzyme causes a massive conformational change, reorienting a loop, effectively locking the coenzyme in place. This binding is more similar to FAD- than to NAD(P)-binding oxidoreductases.[4]

Examples

Some proteins of this family contain a potassium channel beta chain regulatory domain; these are reported to have oxidoreductase activity.[5]

References

  1. ^ Bohren KM, Bullock B, Wermuth B, Gabbay KH (June 1989). "The aldo-keto reductase superfamily. cDNAs and deduced amino acid sequences of human aldehyde and aldose reductases". J. Biol. Chem. 264 (16): 9547–51. PMID 2498333.  
  2. ^ Schade SZ, Early SL, Williams TR, Kézdy FJ, Heinrikson RL, Grimshaw CE, Doughty CC (March 1990). "Sequence analysis of bovine lens aldose reductase". J. Biol. Chem. 265 (7): 3628–35. PMID 2105951.  
  3. ^ Wilson DK, Bohren KM, Gabbay KH, Quiocho FA (July 1992). "An unlikely sugar substrate site in the 1.65 A structure of the human aldose reductase holoenzyme implicated in diabetic complications". Science 257 (5066): 81–4. PMID 1621098.  
  4. ^ Borhani DW, Harter TM, Petrash JM (December 1992). "The crystal structure of the aldose reductase.NADPH binary complex". J. Biol. Chem. 267 (34): 24841–7. PMID 1447221.  
  5. ^ Gulbis JM, Zhou M, Mann S, MacKinnon R (July 2000). "Structure of the cytoplasmic beta subunit-T1 assembly of voltage-dependent K+ channels". Science 289 (5476): 123–7. PMID 10884227.  

This article includes text from the public domain Pfam and InterPro IPR001395

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