Expression of the extracellular domain of the rat liver prolactin receptor and its interaction with ovine prolactin.

A clone of the extracellular domain of the rat liver prolactin receptor was generated by the RNA-based polymerase chain reaction, and the NH2-terminal 210 amino acids were expressed in HeLa cells using a vaccinia virus/T7 hybrid expression system. The protein was isolated from serum-free culture medium directly by chromatography on an ovine prolactin affinity column and yielded approximately 1.5 mg of protein/liter of suspension culture. The extracellular domain of the rat prolactin receptor inhibited the ovine prolactin-dependent mitogenesis of rat lymphoma Nb2 cells with an IC50 of 7.1 pM and bound 125I-labeled ovine prolactin with a Kd of 1.21 +/- 0.19 nM. In contrast, the binding of the 125I-labeled extracellular domain to ovine prolactin exhibited positive cooperativity with a Hill coefficient of 1.73. High pressure gel filtration chromatography was used to demonstrate the formation of a complex consisting of one molecule of ovine prolactin and two molecules of the extracellular domain of the rat prolactin receptor. Complex formation occurred with human growth hormone, but not with ovine growth hormone, a non-lactogen.

• Publication year

  1993

• Venue

  Journal of Biological Chemistry

• Publication date

  1993-10-25

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1016/s0021-9258(18)41534-7PMID 8226744
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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