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Membrane-Proximal Region of the Carboxyl Terminus of the Gonadotropin-Releasing Hormone Receptor (GnRHR) Confers Differential Signal Transduction between Mammalian and Nonmammalian GnRHRs

Hormone Research Center (D.Y.O., J.A.S., J.S.M., M.J.M., H.B.K., J.Y.S.), School of Biological Sciences and Technology, Chonnam National University, Gwangju 500-757; School of Biological Sciences (K.K.), Seoul National University, Seoul 151-742; and Department of Life Science (J.I.K.), Kwangju Institute of Science and Technology, Gwangju 500-712, Korea

Address all correspondence and requests for reprints to: Jae Young Seong, Ph.D., Hormone Research Center, Chonnam National University, Gwangju 500-757, Korea. E-mail: jyseong{at}jnu.ac.kr.

Recently, we demonstrated that the mammalian type-I GnRH receptor (GnRHR) has a high preference for the phospholipase C/protein kinase C (PLC/PKC)-linked signaling pathway, whereas non-mammalian bullfrog (bf) GnRHRs couple to both adenylate cyclase/protein kinase A (AC/PKA)- and PLC/PKC-linked signaling pathways. In the pre-sent study, using AC/PKA-specific reporter (cAMP-responsive element-luciferase) and PLC/PKC-specific reporter (serum-responsive element-luciferase) systems, we attempted to identify the motif responsible for this difference. A deletion of the intracellular carboxyl-terminal tail (C tail) of bfGnRHR-1 remarkably decreased its ability to induce the AC/PKA-linked signaling pathway. Further dissection of the C tail indicated that an HFRK motif in the membrane-proximal sequence of bfGnRHR-1 C tail is a minimal requirement for the AC/PKA-linked signaling pathway as the addition of this motif to rat GnRHR or deletion of it from bfGnRHR-1 significantly affected the ability to induce the AC/PKA-linked signaling pathway. Deletion or addition of the HFRK motif, however, did not critically influence the PLC/PKC-linked signaling pathway. These results indicate that the HFRK motif in the membrane-proximal region confers the differential signal transduction pathways between mammalian and nonmammalian GnRHRs.

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