Abstract
In F(o)F(1)-ATP synthase, multimeric c-subunits are assembled to a ring (c-ring) in the membranes that rotates as protons flow across F(o). We recently reported that assembly of c-ring of Propionigenium modestum in the membranes of Escherichia coli cells required P. modestum UncI, a product of the conserved uncI gene in the F(o)F(1) operon. However, cooperation with endogenous factors in E. coli remained unclear. Here, P. modestum c-subunit was synthesized in vitro in the presence of liposomes. When c-subunit alone was synthesized, it did not form c-ring. However, when c-subunit and P. modestum UncI were synthesized together, c-ring was formed. Fusion of the two kinds of liposomes, one containing only unassembled c-subunit and the other only UncI, resulted in gradual formation of c-ring. Thus, UncI alone can mediate in vitro post-translational c-ring assembly.
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