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J. Bacteriol., Jul 1996, 4313-4318, Vol 178, No. 14
Copyright © 1996, American Society for Microbiology

Promoter analysis of the Xanthomonas campestris pv. campestris gum operon directing biosynthesis of the xanthan polysaccharide

F Katzen, A Becker, A Zorreguieta, A Puhler and L Ielpi
Instituto de Investigaciones Bioquimicas Fundacion Campomar, Facultad de Ciencias Exactas y Naturales, Buenos Aires, Argentina.

The Xanthomonas campestris gum gene cluster is composed of 12 genes designated gumB, -C, -D, -E, -F, -G, -H, -I, -J, -K, -L, and -M. The transcriptional organization of this gene cluster was analyzed by the construction of gum-lacZ transcriptional fusions in association with plasmid integration mutagenesis. This analysis, coupled with primer extension assays, indicated that the gum region was mainly expressed as an operon from a promoter located upstream of the first gene, gumB.


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