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J. Bacteriol., Apr 1996, 2424-2426, Vol 178, No. 8
Copyright © 1996, American Society for Microbiology

ATP-dependent H+ -pump activity in inverted vesicles of Methanosarcina mazei Go1 and characterization of membrane ATPase

KI Inatomi
Advanced Technology R & D Center, Mitsubishi Electric Corporation, Hyogo, Japan. inatomi@bio.crl.melco.co.jp

ATP-dependent H+ -pump activity was found in inverted vesicles of Methanosarcina mazei Go1 by using acridine orange as a fluorescent probe. The H+ -pump activity specifically required both Mg and sulfite ions, but azide, an inhibitor of F0F1-ATPase, did not inhibit the activity. The membranes prepared from M. mazei also had an Mg-ATPase activity, and at least the presence of vacuolar-type ATPase was detected.


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