Abstract
In prokaryotes and eukaryotes, the general secretion (Sec) pathway transports preproteins across membranes. The ATPase SecA mediates preprotein translocation through the integral membrane channel SecYEG. SecA exists in a monomer-dimer equilibrium at micromolar concentrations that is highly sensitive to salt concentration and temperature (1,2). Interestingly, the published crystal structures of SecA reveal different dimerization interfaces. It is unclear which of these structures, if any, represents the physiological dimer interface.
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