Suppression of signal sequence defects and azide resistance in Escherichia coli commonly result from the same mutations in secA.

Abstract excerpt

The SecA protein of Escherichia coli is required for protein translocation from the cytoplasm. The complexity of SecA function is reflected by missense mutations in the secA gene that confer several different phenotypes: (i) conditional-lethal alleles cause a generalized block in protein secretion, resulting in the cytoplasmic accumulation of the precursor forms of secreted proteins; (ii) azi alleles confer...

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