Nucleic Acids Research, 1986, Vol. 14, No. 7 2891-2903
© 1986
Articles |
DNA sequence of Rhizobium trifolii nodulation genes reveals a reiterated and potentially regulatory sequence preceding nodABC and nodFE
CSIRO, Division of Plant Industry GPO Box 1600, Canberra, ACT 2601, Australia
*To whom correspondence should be addressed
Received February 13, 1986. Accepted March 13, 1986.
The Rhizobium trifolii nod genes required for hostspecific nodulation of clovers are located on 14 kb of Sym (symbiotic) plasmid DNA. Analysis of the nucleotide sequence of a 3.7 kb portion of this region has revealed open reading frames corresponding to the nodABCDEF genes. A DNA sequencing technique, using primer extension from within Tn 5, has been used to determine the precise locations of Tn 5 mutations within the nod genes and the phenotypes of the corresponding mutants correlate with their mapped locations. The predicted nodA and nodB genes overlap by four nucleotides and the nod F and nodE genes overlap by a single nucleotide, suggesting that translational coupling may ensure the synthesis of equimolar amounts of these gene products. ThenodABC and nodFE genes constitute separate transcriptional units and each is preceded by a conserved 76bp sequence which may be involved in the regulation of expression of these genes.
1Present address: Department of MOlecular Biology, Genentech, Inc., 460 Point San Bruno Boulevard, South San Francisco, CA 94080,USA
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