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PLANT PHYSIOLOGY , Vol 106, Issue 4 1659-1665, Copyright © 1994 by American Society of Plant Biologists

MOLECULAR BIOLOGY AND GENE REGULATION

Structural Features of the Maize sus1 Gene and Protein

J. R. Shaw, R. J. Ferl, J. Baier, D. St Clair, C. Carson, D. R. McCarty and L. C. Hannah
Program in Plant Molecular and Cellular Biology and Department of Horticultural Sciences, University of Florida, Gainesville, Florida 32611

Genomic clones, cDNA clones, and protein of the maize (Zea mays L.) Suc synthase1 (sus1) gene were isolated and sequenced. Termini (5[prime] and 3[prime]) of the transcribed unit were identified. The SUS1 protein was purified from tissue culture cells as a phosphorylated protein. The overall structure of sus1 is virtually identical with that of the paralogous gene, shrunken1 (sh1);however, the last intron of sh1 is missing in sus1 This intron bears much sequence similarity with the adjacent exon, suggesting that the intron arose from an internal duplication. Although the placement of the other 14 introns is identical in both genes, the introns exhibit markedly greater differences in size and sequence relative to that shown by the exons. An explanation for the differential rate of divergence of exons and introns is selection pressure for gene function. Additionally, comparisons of coding regions of plant sucrose synthases show that sh1-like and sus1-like genes can be found in all monocots so far analyzed. These latter observations point to an important role played by both genes in this group of plants.


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