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Proteins/UNIPROT:Q8N4T8
Component of the heterotetramer complex KAR (3-ketoacyl-[acyl carrier protein] reductase or 3-ketoacyl-[ACP] reductase) that forms part of the mitochondrial fatty acid synthase (mtFAS). Beta-subunit of the KAR heterotetramer complex, responsible for the 3-ketoacyl-ACP reductase activity of the mtFAS, reduces 3-oxoacyl-[ACP] to (3R)-hydroxyacyl-[ACP] in a NADPH-dependent manner with no chain length preference, thereby participating in mitochondrial fatty acid biosynthesis. The homotetramer has NADPH-dependent quinone reductase activity (in vitro), hence could play a role in protection against cytotoxicity of exogenous quinones. As a heterotetramer, it can also reduce 9,10-phenanthrenequinone, 1,4-benzoquinone and various other o-quinones and p-quinones (in vitro)..
Function from UniProtKB (Q8N4T8), read 2026-09-23. CC BY 4.0.
Curated compounds routed: 0
54 statements
54 statements · 5 reference databases · Subject: CBR4 · Sources: Hetionet, Human Protein Atlas, Human-GEM, Reactome, Rhea
7 reactions
6 names
Resolves to: CBR4
Human-GEM MAR01098CC BY 4.0Reference data
MAM00747r+proton+NADPH(4-)MAM01087r+NADP(3-)
Catalysed by HSD17B14 or HSD3B7 or DHRS2 or HTATIP2 or RDH10 or MDH1B or RDH12 or CBR4 or CTBP1 or BDH2 or HSD11B1L or SDR9C7 and 12 more alternatives
Reaction pageReversibleBalancedEC 1.1.1.-endoplasmic reticulum
Human-GEM MAR01813CC BY 4.0Reference data
MAM01029c+proton+NADPH(4-)MAM01229c+NADP(3-)
Catalysed by HTATIP2 or MDH1B or RDH12 or CBR4 or CTBP1 or RDH13 or BDH2 or HSD11B1L or SDR9C7 or SDR16C5 or HSD11B2 or SDR42E2 and 10 more alternatives
Reaction pageReversibleBalancedEC 1.1.1.-cytosol
Human-GEM MAR06670CC BY 4.0Reference data
4-methyl-2-oxopentanoate+proton+NADH(2-)2-hydroxy-4-methylvaleric acid+NAD(+)
Catalysed by DHRS2 or HTATIP2 or MDH1B or CBR4 or CTBP1 or BDH2 or HSD11B1L or SDR9C7 or SDR16C5 or SDR42E2 or SDR42E1 or WWOX and 6 more alternatives
Reaction pageReversibleBalancedEC 1.1.1.-cytosol
Human-GEM MAR06925CC BY 4.0Reference data
MAM00799m+NADP(3-)proton+NADPH(4-)+MAM03168m
Catalysed by DHRS2 or HTATIP2 or MDH1B or RDH12 or CBR4 or CTBP1 or BDH2 or HSD11B1L or SDR9C7 or SDR42E2 or SDR42E1 or WWOX and 7 more alternatives
Reaction pageReversibleBalancedEC 1.1.1.-mitochondrial matrix
Human-GEM MAR09804CC BY 4.0Reference data
a (3R)-hydroxyacyl-[ACP]+NADP(3-)a 3-oxoacyl-[ACP]+NADPH(4-)+hydron
Reaction pageRight to leftBalance undeterminable
Rhea RHEA:17397CC BY 4.0Reference data
a quinone+NADPH(4-)+hydrona quinol+NADP(3-)
Catalysed by CBR3 or NQO1 or CBR4
Reaction pageLeft to rightBalance undeterminable
Rhea RHEA:46164CC BY 4.0Reference data