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Science 22 July 1983:
Vol. 221. no. 4608, pp. 370 - 371
DOI: 10.1126/science.221.4608.370
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Articles
An Altered aroA Gene Product Confers Resistance to the Herbicide Glyphosate
LUCA COMAI 1,
LOUVMINIA C. SEN 1, and
DAVID M. STALKER 1
1 Calgene, Inc., 1910 Fifth Street, Davis, California 95616
The hypothesis that the herbicide glyphosate (N-phosphonomethylglycine) acts on plants and microorganisms by inhibiting synthesis of 5-enolpyruvyl-3-phosphoshikimate, a precursor to aromatic amino acids, was tested. Salmonella typhimurium was treated with ethyl methanesulfonate, and mutants mapping at the aroA locus, which encodes 5-enolpyruvyl-3-phosphoshikimate synthetase, were isolated by selection for glyphosate resistance. One of the mutants results in the synthesis of a 5-enolpyruvyl-3-phosphoshikimate synthetase that is resistant to inhibition by glyphosate. The mutant aroA gene and the corresponding wild-type allele were cloned. The mutation confers high resistance to glyphosate when introduced in Escherichia coli in the presence or absence of the wild-type aroA allele.
Submitted on February 4, 1983
Revised on May 9, 1983
THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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