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J. Biol. Chem., Vol. 276, Issue 20, 17190-17198, May 18, 2001

This Article Full Text Full Text (PDF) All Versions of this Article: 276/20/17190    most recent M101129200v1 Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Lerouge, I. Articles by Carlson, R. W. Search for Related Content PubMed PubMed Citation Articles by Lerouge, I. Articles by Carlson, R. W. Social Bookmarking                      What's this?

Identification of an ATP-binding Cassette Transporter for Export of the O-antigen across the Inner Membrane in Rhizobium etli Based on the Genetic, Functional, and Structural Analysis of an lps Mutant Deficient in O-antigen^*

Inge Lerouge, Toon Laeremans, Christel Verreth, Jos Vanderleyden^§¶, Caroline Van Soom^§, Andrea Tobin^**, and Russell W. Carlson^**

From the  Centre of Microbial and Plant Genetics, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20, Heverlee B-3001, Belgium and the ^** Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602

For O-antigen lipopolysaccharide (LPS) synthesis in bacteria, transmembrane migration of undecaprenyl pyrophosphate-bound O-antigen oligosaccharide subunits or polysaccharide occurs before ligation to the core region of the LPS molecule. In this study, we identified by mutagenesis an ATP-binding cassette transporter in Rhizobium etli CE3 that is likely responsible for the translocation of the O-antigen across the inner plasma membrane. Mutant FAJ1200 LPS lacks largely the O-antigen, as shown by SDS-polyacrylamide gel electrophoresis and confirmed by immunoblot analysis. Furthermore, LPS isolated from FAJ1200 is totally devoid of any O-chain glycosyl residues and contains only those glycosyl residues that can be expected for the inner core region. The membrane component and the cytoplasmic ATP-binding component of the ATP-binding cassette transporter are encoded by wzm and wzt, respectively. The Tn5 transposon in mutant FAJ1200 is inserted in the wzm gene. This mutation resulted in an Inf phenotype in bean plants.

The nucleotide sequence(s) reported in this paper has been submitted to the GenBank^TM/EMBL Data Bank with accession number(s) AF182824.

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