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Nucleic Acids Research, 1985, Vol. 13, No. 10 3407-3418
© 1985

Articles

Conservation of nif- and species-specific domains within repeated promoter sequences from fast-growing Rhizobium species

Peter R. Schofield* and John M. Watson*

Centre for Recombinant DNA Research, Research School of Biological Sciences, Australian National University P.O. Box 475, Canberra City, ACT 2601, Australia

Received March 6, 1985. Revised May 3, 1985. Accepted May 3, 1985.

In the fast-growing Rhisobiun species, repeated DNA sequences, which include the promoter region of the nif HDK operon have been described. These repeated sequences are promoters which specifically activate transcription in the endosymbiotic state. Hybridization analysis of these sequences from R. trifolii has revealed that they may be involved in the species-specific activation of the various genes whose transcription they promote. Comparative analysis of various copies of these repeated sequences, from R. trifolii (the clover symbiont) and R. meliloti (the alfalfa symbiont), reveals the presence of domains of intra- and interspecific conservation within the promoter regions. We suggest that these promoter elements represent sites which are involved in the species-specific and general, nif-specific activation of Rhisobium symbiotic genes.

*Present address: CSIRO Division of Plant Industry, P.O. Box 1600, Canberra City, ACT 2601, Australia


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