Zinc binding to human lactogenic hormones and the human prolactin receptor |
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Authors: | Voorhees Jeffrey L Rao Geeta Vittal Gordon Timothy J Brooks Charles L |
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Institution: | Ohio State Biochemistry Program, The Ohio State University, Columbus, OH 43210, United States. Voorhees.6@osu.edu |
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Abstract: | Zinc half sites are present in all human lactogenic hormones: human prolactin (hPRL), growth hormone (hGH), placental lactogens (hPL) and the hPRL receptor (hPRLr). The influence of divalent zinc (Zn(2+)) as measured by intrinsic fluorescence or FRET in each of these hormones is unique and is affected by the presence of varying stoichiometries of hPRLr. These data show that both Zn(2+) and hPRLr binding influence hPRL conformers in an interdependent fashion. Although each of these three lactogenic hormones bind hPRLr and induce a biological response that is sensitive to the presence of increasing concentrations of Zn(2+), each hormone is unique in the mechanistic details of this process. |
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