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Structural location of cysteine cross-links chosen for mutagenesis. The antiparallel physiological B. subtilis SecA homodimer is shown (7, 12), along with the positions of the two mutant pairs chosen for mutagenesis. (A) Asp10/Lys612, corresponding to Gly11/Ser661of E. coli SecA, is shown in yellow/red. (B) Asn588/Arg750, corresponding to Arg637/Gln801of E. coli SecA, is shown in yellow/red.
