Add time:09/01/2019         Source:sciencedirect.com

Prolactin-like protein C (PLP-C) is a member of the rat placental family of proteins which are structurally related to pituitary prolactin (PRL). In an effort to characterize the receptor specificity and biological activity of PLP-C, we used a PLP-C cDNA to express the recombinant protein in a bacterial system. The PLP-C cDNA was modified by oligonucleotide mutagenesis and ligated into a human carbonic anhydrase II (hCAII) expression vector. Following a single step affinity purification, the hCAII-PLP-C fusion protein was digested with enterokinase to release a 25 kDa protein. N-Terminal sequence analysis of the 25 kDa band demonstrated identity with PLPC. A polyclonal antiserum to the fusion protein cross reacted with seven major proteins in rat placental culture media of which two were the native forms of PLP-C. Recombinant PLP-C was not mitogenic in the Nb2 lymphoma bioassay and did not exhibit high affinity binding to rat PRL receptor. The choice of hCA-II fusion allows for rapid purification of rPLP-C which will aid in further investigation of the biological role of PLP-C.

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