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. 1987 Aug;84(15):5167–5171. doi: 10.1073/pnas.84.15.5167

Recruitment of substrate-specificity properties from one enzyme into a related one by protein engineering.

J A Wells, B C Cunningham, T P Graycar, D A Estell
PMCID: PMC298815  PMID: 3299378

Abstract

The Bacillus licheniformis and Bacillus amyloliquefaciens subtilisins differ by 31% in protein sequence and by factors of greater than 60 in catalytic efficiency, kcat/Km, toward various substrates. Despite large differences in sequence and substrate specificity for these serine proteases, only two amino acid substitutions (residues 156 and 217) occur within 4 A (contact distance) of modeled substrates, and a third substitution (residue 169) is within 7 A. The three B. licheniformis substitutions (Ser-156/Ala-169/Leu-217) were introduced into the wild-type B. amyloliquefaciens subtilisin (Glu-156/Gly-169/Tyr-217) by site-directed mutagenesis. The substrate specificity of the triple mutant approaches that of B. licheniformis enzyme when assayed with seven different substrates that vary in charge, size, and hydrophobicity. Thus, specificity properties of distantly related and functionally divergent enzymes can be exchanged by limited amino acid replacements, in this case representing less than 4% of the sequence differences.

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Selected References

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