Protein: NADH-cytochrome b5 reductase 1 (EC 1.6.2.2) (Microsomal cytochrome b reductase) (P35) (P38626)
Organism: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast)
Function: NADH-dependent reductase for KTI11/DPH3 and cytochrome b5. Required for the first step of diphthamide biosynthesis, a post-translational modification of histidine which occurs in elongation factor 2. 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. 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. The cytochrome b5/NADH cytochrome b5 reductase electron transfer system supports the catalytic activity of several sterol biosynthetic enzymes. Plays a role in bud morphology.
Subcellular location: Mitochondrion outer membrane {ECO:0000269|PubMed:16407407}; Single-pass membrane protein {ECO:0000255}.
Sequence: MAIDAQKLVVVIVIVVVPLLFKFIIGPKTKPVLDPKRNDFQSFPLVEKTILTHNTSMYKFGLPHADDVLGLPIGQHIVIKANINGKDITRSYTPTSLDGDTKGNFELLVKSYPTGNVSKMIGELKIGDSIQIKGPRGNYHYERNCRSHLGMIAGGTGIAPMYQIMKAIAMDPHDTTKVSLVFGNVHEEDILLKKELEALVAMKPSQFKIVYYLDSPDREDWTGGVGYITKDVIKEHLPAATMDNVQILICGPPAMVASVRRSTVDLGFRRSKPLSKMEDQVFVF
InterPro domains: - IPR001834: NADH:cytochrome b5 reductase-like (family) [30-284]
- IPR017938: Riboflavin synthase-like beta-barrel (homologous_superfamily) [38-143]
- IPR001433: Oxidoreductase FAD/NAD(P)-binding (domain) [151-260]
- IPR017927: FAD-binding domain, ferredoxin reductase-type (domain) [38-142]
- IPR001709: Flavoprotein pyridine nucleotide cytochrome reductase (domain) [90-254]
- IPR008333: Flavoprotein pyridine nucleotide cytochrome reductase-like, FAD-binding domain (domain) [43-141]
- IPR039261: Ferredoxin-NADP reductase (FNR), nucleotide-binding domain (homologous_superfamily) [128-273]
Interaction partners: - Dihydroorotate dehydrogenase
- Cytochrome b5
- 2-
- Diphthamide biosynthesis protein 3
- 2-
- NADPH--cytochrome P450 reductase
- Probable NADPH:adrenodoxin oxidoreductase, mitochondrial
- Protein KTI13
Gene Ontology annotations:
Molecular Function (MF): GO:0003674 (molecular function), GO:0005488 (binding), GO:0003824 (catalytic activity), GO:0005515 (protein binding), GO:0016491 (oxidoreductase activity), GO:0016651 (oxidoreductase activity, acting on NAD(P)H), GO:0016653 (oxidoreductase activity, acting on NAD(P)H, heme protein as acceptor)
Biological Process (BP): GO:0008150 (biological process), GO:0008152 (metabolic process), GO:0009987 (cellular process), GO:0009058 (biosynthetic process), GO:0044237 (cellular metabolic process), GO:0044281 (small molecule metabolic process), GO:0006807 (nitrogen compound metabolic process), GO:0071704 (organic substance metabolic process), GO:0044238 (primary metabolic process), GO:1901360 (organic cyclic compound metabolic process), GO:1901564 (organonitrogen compound metabolic process), GO:1901576 (organic substance biosynthetic process), GO:0006139 (nucleobase-containing compound metabolic process), GO:0046483 (heterocycle metabolic process), GO:0055086 (nucleobase-containing small molecule metabolic process), GO:0019637 (organophosphate metabolic process), GO:0044249 (cellular biosynthetic process), GO:0006725 (cellular aromatic compound metabolic process), GO:0034641 (cellular nitrogen compound metabolic process), GO:1901135 (carbohydrate derivative metabolic process), GO:0006793 (phosphorus metabolic process), GO:1901566 (organonitrogen compound biosynthetic process), GO:1901362 (organic cyclic compound biosynthetic process), GO:0006753 (nucleoside phosphate metabolic process), GO:0019438 (aromatic compound biosynthetic process), GO:0019693 (ribose phosphate metabolic process), GO:0018130 (heterocycle biosynthetic process), GO:0090407 (organophosphate biosynthetic process), GO:0044271 (cellular nitrogen compound biosynthetic process), GO:0006796 (phosphate-containing compound metabolic process), GO:0072521 (purine-containing compound metabolic process), GO:1901137 (carbohydrate derivative biosynthetic process), GO:0034654 (nucleobase-containing compound biosynthetic process), GO:0009259 (ribonucleotide metabolic process), GO:0009117 (nucleotide metabolic process), GO:0046390 (ribose phosphate biosynthetic process), GO:0006163 (purine nucleotide metabolic process), GO:0072522 (purine-containing compound biosynthetic process), GO:1901293 (nucleoside phosphate biosynthetic process), GO:0052652 (cyclic purine nucleotide metabolic process), GO:0009165 (nucleotide biosynthetic process), GO:0006164 (purine nucleotide biosynthetic process), GO:0009150 (purine ribonucleotide metabolic process), GO:0009260 (ribonucleotide biosynthetic process), GO:0009187 (cyclic nucleotide metabolic process), GO:0009152 (purine ribonucleotide biosynthetic process), GO:0046068 (cGMP metabolic process), GO:0009190 (cyclic nucleotide biosynthetic process), GO:0006171 (cAMP biosynthetic process)
Cellular Component (CC): GO:0005575 (cellular component), GO:0110165 (cellular anatomical entity), GO:0005622 (intracellular anatomical structure), GO:0043226 (organelle), GO:0005737 (cytoplasm), GO:0012505 (endomembrane system), GO:0043229 (intracellular organelle), GO:0005783 (endoplasmic reticulum), GO:0043227 (membrane-bounded organelle), GO:0043231 (intracellular membrane-bounded organelle)