NADH-cytochrome b5 reductase 1

UniProtKB accession:  P38626

Grouped By:  Matching UniProtKB accession

UniProtKB description:  NADH-dependent reductase for KTI11/DPH3 and cytochrome b5 (PubMed:14930, PubMed:10622712, PubMed:27694803, PubMed:31463593, PubMed:34154323). Required for the first step of diphthamide biosynthesis, a post-translational modification of histidine which occurs in elongation factor 2 (PubMed:31463593, PubMed:34154323, PubMed:27694803). DPH1 and DPH2 transfer a 3-amino-3-carboxypropyl (ACP) group from S-adenosyl-L-methionine (SAM) to a histidine residue, the reaction is assisted by a reduction system comprising KTI11/DPH3 and a NADH-dependent reductase, predominantly CBR1 (PubMed:31463593, PubMed:34154323). By reducing KTI11/DPH3, also involved in the formation of the tRNA wobble base modification mcm5s 2U (5-methoxycarbonylmethyl-2-thiouridine), mediated by the elongator complex (PubMed:27694803). The cytochrome b5/NADH cytochrome b5 reductase electron transfer system supports the catalytic activity of several sterol biosynthetic enzymes (PubMed:10622712). Plays a role in bud morphology (PubMed:17895367).