Journal
BIOTECHNOLOGY LETTERS
Volume 30, Issue 8, Pages 1397-1401Publisher
SPRINGER
DOI: 10.1007/s10529-008-9703-8
Keywords
aroA gene; 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS); error-prone PCR; glyphosate; Pseudomonas stutzeri
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A novel class II 5-enoylpyruvylshikimate-3-phosphate synthase (EPSPS) was identified from Pseudomonas stutzeri A1501 by complementation of an Escherichia coli auxotrophic aroA mutant. The single amino acid substitution of serine (Ser) for asparagine (Asn)-130 of the A1501 EPSPS enhanced resistance to 200 mM glyphosate. The mutated EPSPS had a 2.5-fold increase for IC50 [glyphosate] value, a 2-fold increase for K-i [glyphosate] value, but a K-m [PEP] value similar to that of wild type. The effect of the single residue mutation on glyphosate resistance was also analyzed using a computer-based three-dimensional model.
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