Table II.

Spectrophotometric assays of PDC, KGDC, and BCKDC in three species

Data represent the mean ± se of at least three mitochondria preparations and are expressed as nanomoles NADH per minute per milligram of protein.

	Substrate	Pea	Rice	Arabidopsis
PDC	Pyruvate	67 ± 5.5	83 ± 3.1	185 ± 12.5
KGDC	α-Ketoglutarate	40 ± 0.8	99 ± 6.7	139 ± 9.8
BCKDC	α-Ketoisocaproic acid (Leu)	0 ± 0.4	4.5 ± 1.8	25 ± 3.1
	α-Keto-β-methylvaleric acid (Ile)	0 ± 0.4	1.6 ± 0.2	21 ± 1.0
	α-Ketoisovaleric acid (Val)	1 ± 0.9	0 ± 2.0	34 ± 3.2