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  • Title: Primary structure of the soybean nodulin-23 gene and potential regulatory elements in the 5'-flanking regions of nodulin and leghemoglobin genes.
    Author: Mauro VP, Nguyen T, Katinakis P, Verma DP.
    Journal: Nucleic Acids Res; 1985 Jan 11; 13(1):239-49. PubMed ID: 3839073.
    Abstract:
    The nodulin-23 gene of soybean is one of the most abundantly transcribed genes induced during symbiosis with Rhizobium. Using a plasmid (pNod25) from a nodule cDNA library, we have isolated the nodulin-23 gene from a soybean genomic library. Nucleotide sequence analysis of the cDNA and of the genomic clone indicated that the coding region of this gene is 669 bp long and is interrupted by a single intron of about 530 bp. The deduced protein sequence suggests that nodulin-23 may have a signal sequence. The 5'-flanking sequence of two other nodulin genes, nodulin-24 encoding for a membrane polypeptide and one of the leghemoglobin genes (LbC3), were obtained. Comparison of these sequences revealed three conserved regions, one of which, an octanucleotide (GTTTCCCT), has 100% homology. The conserved sequences are arranged in a unique fashion and have a spatial organization with respect to order and position, which may suggest a potential regulatory role in controlling the expression of nodulin and leghemoglobin genes during symbiosis.
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