Cited by 71Receptor Mechanisms and SignalingHypothalamic control of reproductive hormonesProtein Kinase Regulation and GTPase Signaling

Disease-causing Mutation in GPR54 Reveals the Importance of the Second Intracellular Loop for Class A G-protein-coupled Receptor Function

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Wacker, Jennifer L., Feller, David B., Tang, Xiao-Bo, DeFino, Mia C., Namkung, Yuree, Lyssand, John S., Mhyre, Andrew J., Tan, Xu +2 more·2008·Journal of Biological Chemistry

Abstract

The G-protein-coupled receptor (GPCR) GPR54 is essential for the development and maintenance of reproductive function in mammals. A point mutation (L148S) in the second intracellular loop (IL2) of GPR54 causes idiopathic hypogonadotropic hypogonadism, a disorder characterized by delayed puberty and infertility. Here, we characterize the molecular mechanism by which the L148S mutation causes disease and address the role of IL2 in Class A GPCR function. Biochemical, immunocytochemical, and pharmacological analysis demonstrates that the mutation does not affect the expression, ligand binding properties, or protein interaction network of GPR54. In contrast, diverse GPR54 functional responses are markedly inhibited by the L148S mutation. Importantly, the leucine residue at this position is highly conserved among class A GPCRs. Indeed, mutating the corresponding leucine of the alpha(1A)-AR recapitulates the effects observed with L148S GPR54, suggesting the critical importance of this hydrophobic IL2 residue for Class A GPCR functional coupling. Interestingly, co-immunoprecipitation studies indicate that L148S does not hinder the association of Galpha subunits with GPR54. However, fluorescence resonance energy transfer analysis strongly suggests that L148S impairs the ligand-induced catalytic activation of Galpha. Combining our data with a predictive Class A GPCR/Galpha model suggests that IL2 domains contain a conserved hydrophobic motif that, upon agonist stimulation, might stabilize the switch II region of Galpha. Such an interaction could promote opening of switch II of Galpha to facilitate GDP-GTP exchange and coupling to downstream signaling responses. Importantly, mutations that disrupt this key hydrophobic interface can manifest as human disease.

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  • The Leu148Ser substitution in the KiSS-1 receptor is located near the DRW(Y) motif, which has an important role in regulating activation and inactivation of many G-protein-coupled receptors.

    “This substitution is located near the DRW(Y) motif, a motif that has an important role in regulating the activation and inactivation of many G-protein-coupled receptors.”

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1 retracted

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Research works printed but not linked: 3

  1. de Roux, N., Genin, E., Carel, J.-C., Matsuda, F., Chaussain, J.-L., and Milgrom, E. (2003) Proc. Natl. Acad. Sci. U. S. A 100, 10972-10976
  2. Cai, K., Itoh, Y., and Khorana, H. G. (2001) Proc. Natl. Acad. Sci. 98, 4877-4882
  3. Johnston, C. A., and Siderovski, D. P. (2007) Proc. Natl. Acad. Sci. U. S. A. 104, 2001-2006

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Authors
Wacker, J. L., Feller, D. B., Tang, X.-B., DeFino, M. C., Namkung, Y., Lyssand, J. S., Mhyre, A. J., Tan, X., Jensen, J. B., & Hague, C.
Affiliations
  • University of Washington (US)
  • Fred Hutch Cancer Center (US)
Corresponding author
Hague, Chris
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2008-11
Volume
283
Issue
45
Pages
31068-31078
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1997180803
Cited by
71
References
48
Citations by year
2024: 2 · 2023: 1 · 2021: 1 · 2020: 5 · 2019: 4 · 2018: 3 · 2017: 1 · 2016: 2 · 2015: 4 · 2014: 5 · 2013: 10 · 2012: 4
FWCI
3.98
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • University of Washington
  • National Institutes of Health (5u54hd012629-31, 5t32gm007108-40, GM-07270, GM07108, GM07750, RO1 NS08174, NS08174, T32 GM07108)
  • National Institute of General Medical Sciences (GM-07270, T32-GM07270, T32 GM07750, T32GM007270, T32GM007750, T-32 GM07108)
  • National Institute of Neurological Disorders and Stroke (R01 NS08174, R01NS008174)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (T32 HD07453, U54-HD-12629, T32HD007453)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
GPR54, second intracellular loop, class A G protein-coupled receptors, idiopathic hypogonadotropic hypogonadism, G protein coupling, switch II, hydrophobic interface, alpha1A-adrenergic receptor, reproductive function, delayed puberty, infertility
MeSH terms
Receptors, Kisspeptin-1, Cell Line, Guanosine Diphosphate, Guanosine Triphosphate, Humans, Hypogonadism, Point Mutation, Amino Acid Substitution, Amino Acid Motifs, Genetic Diseases, Inborn, Receptors, G-Protein-Coupled, GTP-Binding Protein alpha Subunits, Hydrophobic and Hydrophilic Interactions

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