[No authors listed]
The Aprt locus of Drosophila melanogaster encodes the structural gene for adenine phosphoribosyltransferase (APRT). DNA cloned from microdissected salivary gland polytene chromosome region 62B7-12 was used in conjunction with chromosome walking and hybrid selection of mRNA to isolate the Aprt gene. Aprt lies at cytogenetic position 62B9 and is closely flanked by other genes of unknown function. Nucleotide sequencing shows that four APRT cDNAs have a common 5' terminus with an apparent cap consensus sequence but two different 3' sites of polyadenylation. The distribution of conserved amino acid sequences in APRT from vertebrates, insects and bacteria suggests that they may have shared a common ancestral gene for this ubiquitous enzyme.
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