ñ-Ketoisovaleric acid is an organic compound with the formula (CH<sub>3</sub>)<sub>2</sub>CHC(O)CO<sub>2</sub>H. It is a ketoacid. With a melting point just above room temperature, it is usually an oil or semi-solid. The compound is colorless. It is a metabolite of valine and a precursor to pantothenic acid, a prosthetic group found in several cofactors. In the biological context, is usually encountered as its conjugate base ketoisovalerate, (CH<sub>3</sub>)<sub>2</sub>CHC(O)CO<sub>2</sub><sup>âÂÂ</sup>.
ñ-Ketoisovalerate undergoes hydroxymethylation to give ketopantoate:
This conversion is catalyzed by ketopantoate hydroxymethyltransferase.
Like many ñ-ketoacids, ñ-ketoisovaleric acid is prone to decarboxylation to give isobutyraldehyde:
Genetic engineering has been used to produce the biofuel isobutanol by reduction of isobutyraldehyde obtained from ketoisovalerate.