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The discoidin I genes of Dictyostelium discoideum encode a family of three closely related developmentally regulated lectins which may play a role in cell cohesion. We have isolated a genomic clone containing the 5' half of a discoidin I gene with 12kb of flanking sequence and we have identified the discoidin I polypeptide encoded by this gene. We have determined part of the nucleotide sequence of the cloned segment and have hence determined the N-terminal amino acid sequence of the encoded polypeptide. The nucleotide sequence upstream of the AUG initiation codon was unusually AT rich, with 94% AT base pairs in the 171 nucleotides for which sequence was determined. However, having determined the start point of transcription ('cap' site) two striking features of similarity with other eukaryotic structural genes became apparent. The sequence TATAAA was present 33 nucleotides upstream from the 'cap' site and the sequence CCAAT was present a further 20 nucleotides upstream.

Characterization of sequence elements at the 5′ end of a discoidin I gene isolated from Dictyostelium discoideum