Processing of Escherichia coli alkaline phosphatase: role of the primary structure of the signal peptide cleavage region

Journal of Molecular Biology
A L KaramyshevM A Nesmeyanova

Abstract

A wide range (69) of mutant Escherichia coli alkaline phosphatases with single amino acid substitutions at positions from -5 to +1 of the signal peptide were obtained for studying protein processing as a function of the primary structure of the cleavage region. Amber suppressor mutagenesis, used to create mutant proteins, included: (i) introduction of amber mutations into respective positions of the phoA gene; and (ii) expression of each mutant phoA allele in E. coli strains producing amber suppressor tRNAs specific to Ala, Cys, Gln, Glu, Gly, His, Leu, Lys, Phe, Pro, Ser and Tyr. Most amino acid substitutions at positions -3 and -1 resulted in a complete block of protein processing. These data give new experimental support for the "-3, -1 rule". Only Ala, Gly and Ser at position -1 allowed protein processing, and Ala provided the highest rate of processing. The results revealed the more conservative nature of the amino acids at the -1 position of signal peptides of Gram-negative bacteria as compared with those of eukaryotic organisms. Position -3 was less regular, since not only Ala, Ser and Gly, but also Leu and Cys at this position, allowed the processing. Mutations at position -4 had an insignificant effect on the processin...Continue Reading

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