Identification of the putative cell-free translation product of rat calcitonin mRNA

Messenger RNA from calcitonin-secreting rat medullary thyroid carcinoma lines directs the synthesis of a putative precursor of calcitonin when translated in wheat embryo lysate. The major translation product directed by mRNA isolated from a rat tumor with a calcitonin content representing greater th...

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Bibliographic Details
Published in:The Journal of biological chemistry 1980-04, Vol.255 (7), p.2645-2648
Main Authors: Amara, S G, Rosenfeld, M G, Birnbaum, R S, Roos, B A
Format: Article
Language:English
Subjects:
Animals
Calcitonin - biosynthesis
Calcitonin - metabolism
Molecular Weight
Neoplasm Transplantation
Neoplasms, Experimental - metabolism
Plants - metabolism
Protein Biosynthesis
Rats
RNA, Messenger - metabolism
Thyroid Gland - metabolism
Transplantation, Homologous
Triticum - metabolism
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Summary:Messenger RNA from calcitonin-secreting rat medullary thyroid carcinoma lines directs the synthesis of a putative precursor of calcitonin when translated in wheat embryo lysate. The major translation product directed by mRNA isolated from a rat tumor with a calcitonin content representing greater than 2% of the total protein mass has an apparent molecular weight of 17,500 when analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Immunoprecipitations of the cell-free translation products demonstrate that the 17,500-dalton protein has immunologic determinants which are specifically recognized by antisera to calcitonin. In addition, the relative prominence of this protein is significantly diminished when mRNA from lines with low calcitonin content is used to direct cell-free protein synthesis. This evidence suggests that the initial translation product of calcitonin mRNA is a 17,500-dalton species which must undergo subsequent processing to generate the secreted polypeptide.
ISSN:0021-9258
1083-351X
DOI:10.1016/S0021-9258(19)85781-2