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Sequences of S-glycoproteins, products of the Brassica campestris self-incompatibility locus


The cruciferous genus Brassica has a self-incompatibility system that is under the sporophytic control of a single locus, S (ref. 1). Although evidence has accumulated that S-locus-specific proteins, termed S-glycoproteins2–4, are strongly associated with the expression of self-incompatibility4–8, their structures and functions are still unknown. This paper reports the sequences of the S-glycoproteins from three homozygotes of Brassica campestris. They show extensive homology. The published DNA sequence data for the S6-glycoprotein of B. oleracea9 can be revised to encode the total sequence of the glycoprotein on the basis of the sequences of S-glycoproteins of B. campestris. These S-glycoproteins have cysteine-rich clusters and 6–7 oligosaccharide chains. There is no homology between the S-glycoproteins of Nicotiana alata10 and those of B. campestris.

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Takayama, S., Isogai, A., Tsukamoto, C. et al. Sequences of S-glycoproteins, products of the Brassica campestris self-incompatibility locus. Nature 326, 102–105 (1987).

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