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J Biol Chem, Vol. 273, Issue 43, 27873-27878, October 23, 1998
From the Department of Biochemistry and Molecular Biology,
University of Florida, Gainesville, Florida 32610
In Escherichia coli
F1F0-ATP synthase, the two b
subunits form the second stalk spanning the distance between the
membrane F0 sector and the bulk of F1. Current
models predict that the stator should be relatively rigid and engaged
in contact with F1 at fixed points. To test this
hypothesis, we constructed a series of deletion mutations in the
uncF(b) gene to remove segments from the middle of the
second stalk of the subunit. Mutants with deletions of 7 amino acids
were essentially normal, and those with deletions of up to 11 amino
acids retained considerable activity. Membranes prepared from these
strains had readily detectable levels of F1-ATPase activity
and proton pumping activity. Removal of 12 or more amino acids resulted
in loss of oxidative phosphorylation. Levels of membrane-associated
F1-ATPase dropped precipitously for the longer deletions,
and immunoblot analysis indicated that reductions in activity
correlated with reduced levels of b subunit in the
membranes. Assuming the likely
Deletions in the Second Stalk of F1F0-ATP
Synthase in Escherichia coli
-helical conformation for this area
of the b subunit, the 11-amino acid deletion would result in shortening the subunit by approximately 16 Å. Since these deletions did not prevent the b subunit from participating in
productive interactions with F1, we suggest that the
b subunit is not a rigid rodlike structure, but has an
inherent flexibility compatible with a dynamic role in coupling.
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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