Molecular Biology and Evolution, Vol 8, 781-795, Copyright © 1991 by Society for Molecular Biology and Evolution
JE Minor, DR Fromson, RJ Britten and EH Davidson
Bindin is the sea urchin sperm acrosomal protein that is responsible for
the species-specific adhesion of the sperm to the egg. Two new bindin cDNA
sequences that contain the entire open reading frame for the binding
precursor are reported: one for Strongylocentrotus franciscanus and one for
Lytechinus variegatus. Both contain inverted repetitive sequences in their
3' untranslated regions, and the S. franciscanus cDNA contains an inverted
repetitive sequence match between the 5' untranslated region and the coding
region. The middle third of the mature bindin sequence is highly conserved
in all three species, and the flanking sequences share short repeated
sequences that vary in number between the species. Cross-fertilization data
are reported for the species S. purpuratus, S. franciscanus, L. variegatus,
and L. pictus. A barrier to cross-fertilization exists between the
sympatric Strongylocentrotus species, but there is no barrier between the
allopatric Lytechinus species.
ORIGINAL ARTICLE
Comparison of the bindin proteins of Strongylocentrotus franciscanus, S. purpuratus, and Lytechinus variegatus: sequences involved in the species specificity of fertilization
Division of Biology, California Institute of Technology, Pasadena 91125.
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