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. 1985 Jun 11;13(11):3917–3930. doi: 10.1093/nar/13.11.3917

Cloning of cDNA sequences for an Artemia salina hnRNP protein: evidence for conservation through evolution.

M Cruz-Alvarez, W Szer, A Pellicer
PMCID: PMC341286  PMID: 2409528

Abstract

A cDNA clone was isolated for Artemia salina protein HD40, a component of heterogenous nuclear ribonucleoproteins. Enriched Artemia 15S poly(A)+ RNA was used as a template and double-stranded cDNA sequences were inserted into the Pst I restriction endonuclease site of E. coli plasmid pBR322. Recombinant colonies were analyzed by positive hybrid selection of poly(A)+ RNA that directs the synthesis of protein HD40 in an in vitro assay. In vitro translation of the mRNA selected by recombinant clone 87HD yields a protein that is immunoprecipitated by anti-HD40 antibodies and that comigrates with authentic HD40 on gel electrophoresis. Partial proteolysis of protein HD40 and the in vitro translated product selected by clone 87HD produces the same peptide patterns. The size of the cloned insert is about 820 bp. The length of HD40 mRNA as determined by Northern blot analysis, is about 1500 nucleotides. Southern blot analysis performed with DNA of different species (plant, avian, mammal) shows cross-hybridizing bands when probed with clone 87HD DNA suggesting that the HD40 gene is evolutionarily conserved.

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Selected References

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