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Rotors of different ATPases. E. coli F1F0 is assumed to have 12 copies of the 8-kDa proteolipid, V1V0 ATPase to have six copies of a duplicated 16-kDa proteolipid in which the H+-translocating glutamate is only conserved in hairpin two. The rotor of A. woodii comprises a mixture of “bacterial-like” 8- and “eukaryal-like” 16-kDa proteolipids with unknown stoichiometry.
