These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Ligand-specific dimerization of the extracellular domain of the bovine growth hormone receptor.
    Author: Staten NR, Byatt JC, Krivi GG.
    Journal: J Biol Chem; 1993 Sep 05; 268(25):18467-73. PubMed ID: 8360148.
    Abstract:
    The bovine growth hormone (bGH) receptor and its extracellular domain (bGHBP) bind two protein hormones with high affinity; bGH and bovine placental lactogen (bPL). However, each of these hormones bind with a different stoichiometry. bGH binds to the bGHBP in a 1:2 ratio while bPL binds in a 1:1 ratio. Scatchard analysis of saturation binding yields similar apparent dissociation constants (Kd) for bGH and bPL of 1.4 x 10(-11) M and 3.0 x 10(-11) M, respectively, for the membrane receptor and 6.8 x 10(-11) M and 4.2 x 10(-11) M, respectively, for bGHBP. In competition experiments using either liver membranes or bGHBP, bGH is 2-3-fold more effective than bPL in competing for 125I-bGH-binding sites. In similar experiments using 125I-bPL, bPL is 50-fold more effective than bGH in competing for binding sites. A rat monoclonal antibody raised against bGHBP competes effectively for 125I-bGH-binding sites, but not for 125I-bPL-binding sites. Since bPL cannot dimerize the bGHBP and yet it acts in part as a somatogen in vivo, homodimerization of the growth hormone receptor is apparently not essential for some biological responses signaled through this receptor.
    [Abstract] [Full Text] [Related] [New Search]