title: Cell free translation of chicken calcitonin messenger RNA.
abstract: The primary step of calcitonin biosynthesis was studied in a normal organ: chicken ultimobranchial gland, a tissue particularly rich in calcitonin secretory cells. Poly(A)-rich RNA was extracted and purified from ultimobranchial organs and translated in a reticulocyte lysate in the presence of labelled methionine. Polyacrylamide gel electrophoresis of specific immunoprecipitates revealed a major band of Mr 14 500 and a band of Mr 13 300. Thus, in chicken the precursor of calcitonin is a Mr 14 500 polypeptide. The minor component of Mr 13 300 could represent limited processing by the reticulocyte lysate.
mesh_terms: D000818:Animals; D002116:Calcitonin / Q000096:biosynthesis* / Q000235:genetics; D002474:Cell-Free System; D002645:Chickens; D004591:Electrophoresis, Polyacrylamide Gel; D007120:Immunochemistry; D011061:Poly A / Q000302:isolation & purification; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000378:metabolism*
chemical_list: D012333:RNA, Messenger; D011061:Poly A; D002116:Calcitonin