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. 1986 Sep 1;103(3):969–975. doi: 10.1083/jcb.103.3.969

Studies on the transcription, translation, and structure of alpha- actinin in Dictyostelium discoideum

PMCID: PMC2114308  PMID: 3745276

Abstract

A clone coding for the F-actin cross-linking protein alpha-actinin was obtained by screening a genomic library of Dictyostelium discoideum DNA in lambda gt11 with monoclonal antibodies specific for Dictyostelium alpha-actinin. The 1.2-kilobase (kb) genomic clone was confirmed as containing part of the alpha-actinin gene by comparing its nucleotide sequence with the amino acid sequence of tryptic peptides from purified alpha-actinin. The clone recognized a 3.0-kb message in a Northern blot. Hybridization to RNA isolated from different developmental stages of several D. discoideum strains indicated that the mRNA content increased during early development. A similar result was obtained when the alpha-actinin content of the cells was followed by Western blot analysis. Hybridization of the clone to DNA from different wild-type strains of D. discoideum indicated a polymorphism on the DNA level that coincided with a polymorphism on the protein level. The data suggest continuous transcription of the alpha-actinin gene throughout the development of D. discoideum, up- and down-regulation of the levels of alpha-actinin mRNA and protein with maximum levels at the onset of aggregation, and a high diversity of alpha-actinin at the DNA and protein level among different D. discoideum strains. The structural data make it conceivable that the highly conserved nature of alpha- actinin resides only at the functional sites, whereas the helical portions of the alpha-actinin molecule allow a higher level of diversity throughout evolution.

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Selected References

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