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. 1994 Oct 25;91(22):10285–10289. doi: 10.1073/pnas.91.22.10285

Ankyrin and beta-spectrin accumulate independently of alpha-spectrin in Drosophila.

R R Dubreuil 1, J Yu 1
PMCID: PMC45004  PMID: 7937942

Abstract

We report the identification and initial characterization of Drosophila melanogaster ankyrin. Oligonucleotide primers based on the spectrin-binding domain of human brain ankyrin were used to amplify Drosophila genomic DNA. A cloned 184-bp PCR product was used to isolate Drosophila ankyrin cDNAs. Ankyrin cDNA probes detected a 5.5-kb transcript from embryonic poly(A)+ RNA and a single polytene chromosome locus (101F-102A). The cDNA sequence encodes a 170-kDa protein that is 53% identical to human brain ankyrin (Ank2). Antibodies directed against a recombinant fragment of Drosophila ankyrin reacted with a 170-kDa polypeptide from Drosophila embryos, larvae, S2 cells, and adult flies. The ankyrin antibody coimmunoprecipitated alpha- and beta-spectrin with ankyrin in detergent extracts of Drosophila embryo membranes. Antibodies against Drosophila ankyrin, alpha-spectrin and beta-spectrin were used to detect these proteins in wild-type and alpha-spectrin-mutant larvae. alpha-Spectrin levels were greatly diminished in mutant larvae, but levels of ankyrin and beta-spectrin were indistinguishable from wild type. The persistence of ankyrin and beta-spectrin may explain the relatively mild phenotype of alpha-spectrin mutants during early Drosophila development.

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