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(Received for publication, April 17, 1997, and in revised form, June 16, 1997)
From the Department of Molecular and Cell Biology, Division of
Biochemistry and Molecular Biology, University of California,
Berkeley, California 94720
The superfamily of traffic ATPases (ABC
transporters) includes bacterial periplasmic transport systems
(permeases) and eukaryotic transporters. The histidine permease of
Salmonella typhimurium is composed of a membrane-bound
complex (HisQMP2) containing four subunits, and of a
soluble receptor, the histidine-binding protein (HisJ). Transport is
energized by ATP. In this article the ATPase activity of
HisQMP2 has been characterized, using a novel assay that is
independent of transport. The assay uses Mg2+ ions to
permeabilize membrane vesicles or proteoliposomes, thus allowing access
of ATP to both sides of the bilayer. HisQMP2 displays a low
level of intrinsic ATPase activity in the absence of HisJ; unliganded
HisJ stimulates the activity and liganded HisJ stimulates to an even
higher level. All three levels of activity display positive
cooperativity for ATP with a Hill coefficient of 2 and a
K0.5 value of 0.6 mM. The activity
has been characterized with respect to pH, salt, phospholipids,
substrate, and inhibitor specificity. Free histidine has no effect. The
activity is inhibited by orthovanadate, but not by
N-ethylmaleimide, bafilomycin A1, or ouabain.
Several nucleotide analogs, ADP,
5
Volume 272, Number 35,
Issue of August 29, 1997
pp. 21883-21891
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.
-adenylyl-
,
-imidodiphosphate, adenosine 5
-(
,
imino)triphosphate, and adenosine
5
-O-(3-thio)triphosphate, inhibit the activity.
Unliganded HisJ does not compete with liganded HisJ for the stimulation
of the ATPase activity of HisQMP2.
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