Abstract
We describe useful vectors to select double-crossover events directly in site-directed marker exchange mutagenesis in gram-negative bacteria. These vectors contain the gusA marker gene, providing colorimetric screens to identify bacteria harboring those sequences. The applicability of these vectors was shown by mapping the 3' end of the Xanthomonas campestris gum operon, involved in biosynthesis of xanthan.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Base Sequence
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Chromosome Mapping
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DNA Primers / genetics
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DNA, Bacterial / genetics
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Genes, Bacterial*
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Genetic Vectors*
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Gram-Negative Bacteria / genetics*
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Molecular Sequence Data
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Mutagenesis, Site-Directed
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Operon*
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Reverse Transcriptase Polymerase Chain Reaction
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Xanthomonas campestris / genetics*
Substances
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DNA Primers
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DNA, Bacterial
Associated data
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GENBANK/AF012346
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GENBANK/K01728
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GENBANK/U12639
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GENBANK/U70053