Primary structures of the wild-type and mutant alleles encoding the phosphatidylglycerophosphate synthase of Escherichia coli

Abstract

The nucleotide sequence of the Escherichia coli pgsA gene, encoding phosphatidylglycerophosphate synthase, is revised to code for an enzyme of 182 amino acid residues, instead of the 216 of a previous work (A. S. Gopalakrishnan, Y.-C. Chen, M. Temkin, and W. Dowhan, J. Biol. Chem. 261:1329-1338, 1986). The revised structure now explains the properties of the enzyme. Three pgsA mutants of different phenotypes were also analyzed: pgsA3, pgsA36, and pgsA10 have single-base replacements in codons 60 (Thr-->Pro), 1 (ATG-->ATA), and 92 (Thr-->Ile), respectively.