Table 1.

Subunit composition of the E. coli and mitochondrial ATP synthases

	E. coli subunit	Bovine subunit	Yeast subunit
F1	α3	α3	α3
	β3	β3	β3
	γ1	γ1	γ1
	δ1	OSCP1	Sub 51
	ε1	δ1	δ1
	–	ε1	ε1
	–	IF	IF
F0	A1	Sub. 61	Sub. 61
	B2	b1	Sub 41
	C9 − 15	c9 − 15	Sub 910
	–	d1	Sub 71
	–	e1	e1
	–	f1	f1
	–	g1	g1
	–	F61	h1
	–	A6L1	Sub 81

There are eight and 16 different subunits in the bacterial and bovine enzymes, respectively. Subunits are accommodated according to their corresponding homologs. For example, E. coli δ and ε correspond to bovine OSCP and δ, respectively. Corresponding subunit stoichiometries are indicated as superscripts. The enzyme from yeast (S. cerevisiae) contains at least three additional subunits, namely i, j, and k.