title: Cell-free synthesis of a large translation product of prolactin messenger RNA.
abstract: RNA prepared from rat anterior pituitaries or from prolactin-secreting pituitary tumors has been shown to direct the synthesis of a large form of prolactin in a cell-free system derived from wheat germ. Immunoprecipitation of cell-free reactions demonstrated the synthesis of a product which was recognized by a specific antiprolactin antisera. Analysis of the immunoprecipitate on sodium dodecyl sulfate containing polyacrylamide gels suggested that the cell-free product has a molecular weight of approximately 28,000 compared to 22,500 for prolactin. RNA prepared by completely different techniques from rat pituitary and a pituitary tumor resulted in identical large translation products. Translation of tumor RNA in a cell-free system from Krebs ascites cells also resulted in a similar large product. The identity of the cell-free product as prolactin was confirmed by comparing peptides derived from the cell-free product and prolactin. The results of these studies suggest that prolactin messenger RNA directs the cell-free synthesis of a product which contains the amino acid sequence of prolactin but which has an addition at one or both ends of the molecule.
mesh_terms: D000818:Animals; D002287:Carcinoma, Krebs 2 / Q000378:metabolism; D002474:Cell-Free System; D003488:Cyanogen Bromide; D005260:Female; D007700:Kinetics; D008970:Molecular Weight; D010446:Peptide Fragments / Q000032:analysis; D010902:Pituitary Gland / Q000378:metabolism*; D010903:Pituitary Gland, Anterior / Q000378:metabolism*; D011233:Precipitin Tests; D011388:Prolactin / Q000096:biosynthesis*; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000378:metabolism*; D051381:Rats; D014357:Trypsin
chemical_list: D010446:Peptide Fragments; D012333:RNA, Messenger; D011388:Prolactin; D014357:Trypsin; D003488:Cyanogen Bromide