Has very high activity toward isobutyryl-CoA. Is an isobutyryl-CoA dehydrogenase that functions in valine catabolism. Plays a role in transcriptional coactivation within the ARC complex.
Detected at comparable levels in all tissues examined (heart, lung, brain, skeletal muscle, pancreas and placenta). Weakly expressed in liver and kidney.
Amino-acid degradation; L-valine degradation.
Defects in ACAD8 are the cause of isobutyryl-CoA dehydrogenase deficiency (IBDD) [MIM:611283]. The symptoms of IBDD generally appear until late in infancy or in childhood and can include poor feeding and growth (failure to thrive), a weakened and enlarged heart (dilated cardiomyopathy), seizures, and low numbers of red blood cells (anemia).