Improvement of the activity of arylmalonate decarboxylase by random mutagenesis

Y. Terao, K. Miyamoto, H. Ohta

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Arylmalonate decarboxylase (EC catalyzes enantioselective decarboxylation of α-aryl-α-methylmalonates to give optically pure α-arylpropionates. Recently, we have succeeded in creating a double mutant enzyme that gave opposite enantionmer as the product. Unfortunately, however, the activity of the mutant decreased far lower than that of the native enzyme. Thus, we performed the directed evolution of the mutant via the random mutagenesis method employing the mutator strain Escherichia coli XL1-Red. About 50,000 mutants were screened on color assay plate, and one mutant with higher activity was obtained. Gene analysis of this mutant indicated that the obtained enzyme had an S36N mutation in addition to its original G74C/C188S mutations. The activity of the triple mutant enzyme was tenfold higher than that of the starting doubly mutated enzyme.

Original languageEnglish
Pages (from-to)647-653
Number of pages7
JournalApplied Microbiology and Biotechnology
Issue number3
Publication statusPublished - 2006 Dec


  • Activity
  • Arylmalonate decarboxylase
  • Random-mutagenesis
  • XL1-Red

ASJC Scopus subject areas

  • Biotechnology
  • Applied Microbiology and Biotechnology


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