Abstract

Monoclonal antibodies were raised against a protein with a molecular mass of 24 kDa that has been described as a membrane-associated, actin binding protein from Dictyostelium discoideum [(1985) J. Cell Biol. 100, 727–735]. Using these monoclonal antibodies we isolated from a λgt11 expression library cDNA clones coding for this protein. The cDNA deduced amino acid sequence revealed the presence of an unusual carboxy-terminus which has homologies to the C-termini of Octopus rhodopsin and synaptophysin. This part of the protein sequence contains 5 direct repeats with the motif GYP (P)Q(P). Southern and Northern blots showed that this sequence is present in a series of Dictyostelium genes transcribed in all stages of development.

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