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Nucleic Acids Research, 1984, Vol. 12, No. 24 9509-9524
© 1984

MOLECULAR BIOLOGY

Nucleotide sequence of Rhizobium meliloti nodulation genes

I. Török1, E. Kondorosi1, T. Stepkowski2, J. Pósfai3 and A. Kondorosi2

1Institute of Biochemistry, Biological Research Center of Hungarian Academy of Sciences H-6701 Szeged, POB 521, Hungary 2Institute of Genetics, Biological Research Center of Hungarian Academy of Sciences H-6701 Szeged, POB 521, Hungary 3Institute of Biophysics, Biological Research Center of Hungarian Academy of Sciences H-6701 Szeged, POB 521, Hungary

*To whom correspondence should be addressed

Received September 27, 1984. Revised November 20, 1984. Accepted November 20, 1984.

A Rhizobium meliloti DNA region, determining nodulation functions common in different Rhizobium species, has been delimited by directed Tn5 mutagenesis and its nucleotide sequence has been determined. The sequence data indicates three large open reading frames with the same polarity coding for three proteins of 196, 217 and 402 (or 426) amino acid residues, respectively. We suggest the existence of three nod genes on this region, which were designated as nodA B and C, respectively. Comparison of the R.mellioti nodA, B, C nucleotide and amino acid sequences with those from R.leguminosarum, as reported in the accompanying paper, shows 69–72% homology, clearly demonstrating the high degree of conservation of common nod genes in these Rhizobium species.


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