Pathways & interactions
NADP-dependent oxidoreductase domain superfamily (IPR036812)
Short name: NADP_OxRdtase_dom_sf
- Potassium channel, voltage-dependent, beta subunit, KCNAB1 (IPR005400)
- Potassium channel, voltage-dependent, beta subunit, KCNAB3 (IPR005402)
- Potassium channel, voltage-dependent, beta subunit, KCNAB (IPR005983)
- NADP-dependent oxidoreductase domain (IPR023210)
- Glutamate--cysteine ligase regulatory subunit (IPR032963)
The aldo-keto reductase family 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 [PMID: 2498333]. All possess a similar structure, with a beta-alpha-beta fold characteristic of nucleotide binding proteins [PMID: 2105951]. 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 [PMID: 1621098].
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 [PMID: 1447221].
Some proteins of this entry contain a K+ ion channel beta chain regulatory domain; these are reported to have oxidoreductase activity [PMID: 10884227].
This entry represents the NADP-dependent oxidoreductase domain superfamily.