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Inactivation of the F1-ATPase from the thermophilic bacterium PS3 by 5'-p-fluorosulfonylbenzoylinosine at 65 degrees C is accompanied by modification of beta-tyrosine-364.

A major radioactive peptide, T1, was resolved by high-performance liquid chromatography from a tryptic digest prepared from the F1-ATPase from the thermophilic bacterium PS3 which had been inactivated with p-fluorosulfonylbenzoyl[3H]inosine. Two radioactive peptides, T1P1 and T1P2, were isolated from a peptic digest of T1 by high-performance liquid chromatography. The sequences of T1P1 and T1P2 were shown to be E-E-H-X-Q-V-A-R and E-E-H-X-Q, respectively, where X corresponds to derivatized Tyr-364 of the beta subunit.