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Journal of Bacteriology, July 2002, p. 3539-3548, Vol. 184, No. 13
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.13.3539-3548.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Genetic Locus Encoding Functions Involved in Biosynthesis and Outer Membrane Localization of Xanthomonadin in Xanthomonas oryzae pv. oryzae

Ajay Kumar Goel, Lakshmi Rajagopal,,{dagger} Narayana Nagesh, and Ramesh V. Sonti*

Centre for Cellular and Molecular Biology, Hyderabad 500 007, Andhra Pradesh, India

Received 18 December 2001/ Accepted 3 April 2002

Xanthomonadins are membrane-bound, brominated, aryl-polyene pigments specific to the genus Xanthomonas. We have characterized a genetic locus (pig) from Xanthomonas oryzae pv. oryzae which contains four open reading frames (ORFs) that are essential for xanthomonadin production. Three of these ORFs are homologous to acyl carrier proteins, dehydratases, and acyl transferases, suggesting a type II polyketide synthase pathway for xanthomonadin biosynthesis. The fourth ORF has no homologue in the database. For the first time, we report that a putative cytoplasmic membrane protein encoded in the pig locus is required for outer membrane localization of xanthomonadin in X. oryzae pv. oryzae. We also report the identification of a novel 145-bp palindromic Xanthomonas repetitive intergenic consensus element that is present in two places in the pig locus. We estimate that more than 100 copies of this element might be present in the genome of X. oryzae pv. oryzae and other xanthomonads.

* Corresponding author. Mailing address: Centre for Cellular and Molecular Biology, Hyderabad 500 007, Andhra Pradesh, India. Phone: 91-40-7192577. Fax: 91-40-7160591. E-mail: sonti{at}gene.ccmbindia.org.

{dagger} Present address: Division of Infectious Disease CH32, Childrens Hospital, Regional Medical Center, Seattle, WA 98105.

Journal of Bacteriology, July 2002, p. 3539-3548, Vol. 184, No. 13
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.13.3539-3548.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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