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A stomatin-like protein encoded by the slp gene of Rhizobium etli is required for nodulation competitiveness on the common bean

Xuefeng Gao^1,

Departments of Plant Molecular Physiology Honolulu, HI 96822, USA
Departments of Microbiology,University of Hawaii, Honolulu, HI 96822, USA
Department of Medicine, Rayne Institute, London WC1E 6JJ, UK

ABSTRACT

Rhizobium etli strain TAL182 is a competitive strain for effective nodulation of beans. From this strain, a novel gene was isolated, slp, which is 669 bp in size and required for nodulation competition on the common bean. The slp knockout mutant of TAL182 is defective in nodulation competition, shows reduced growth in the presence of 200 mM NaCl, KCl or LiCl and is complemented by the cloned slp gene. The deduced amino acid sequence of slp shows 66-72% similarity to stomatin proteins of Homo sapiens, Mus musculus and Caenorhabditis elegans. Expression of slp in Escherichia coli from a T7 promoter shows a 26 kDa protein which cross-reacts with human-stomatin-specific polyclonal antibody. Like the human stomatin protein, the slp-deduced protein, Slp, is very hydrophilic except for a single hydrophobic membrane-spanning domain. Among various bean-nodulating rhizobia, slp is present in R. etli, Rhizobium leguminosarum bv. phaseoli and Rhizobium tropici type A strains but is absent in R. tropici type B strains. It is also absent in Bradyrhizobium and several other Rhizobium spp.

^*Author for correspondence: Dulal Borthakur. Tel: +1 808 956 6600. Fax: +1 808 956 3542.

Present address: Stratagene Cloning Systems, 11011 N. Torrey Pines Road, La Jolla, CA 92037, USA.

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