Abstract
Sphingolipids are essential components of eukaryotic cell membranes and are responsible for important cellular functions. A characteristic feature of sphingolipid organization in cellular membranes is their segregation in membrane domains. Serotonin1A receptors are representative members of the superfamily of G-protein coupled receptors (GPCRs) and are implicated in the generation and modulation of various cognitive, developmental, and behavioral functions. We previously reported that sphingolipids are necessary for ligand binding and cellular signaling of the human serotonin1A receptor. Proteins that interact with (glyco)sphingolipids are reported to have a characteristic amino acid sequence, termed the “sphingolipid-binding domain” (SBD). We report here that the human serotonin1A receptor contains a putative SBD, corresponding to amino acids 99 to 109. Interestingly, our analysis shows that the SBD motif appears to be an inherent feature of the serotonin1A receptor and is conserved over natural evolution across various phyla. However, experiments with the 11-mer SBD peptide in model membranes utilizing intrinsic tryptophan fluorescence did not show significant binding, probably highlighting the importance of the overall “context” of the receptor architecture in lipid–GPCR interactions. These results constitute the first report of the presence of SBD in serotonin receptors and could provide novel insight into the molecular nature of GPCR–sphingolipid interaction.
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Abbreviations
- 5-HT1A receptor:
-
5-Hydroxytryptamine-1A receptor
- CRAC:
-
Cholesterol recognition/interaction amino acid consensus
- DMPC:
-
Dimyristoyl-sn-glycero-3-phosphocholine
- FB1 :
-
Fumonisin B1
- GPCR:
-
G-protein coupled receptor
- LED:
-
Light-emitting diode
- LUV:
-
Large unilamellar vesicle
- POPC:
-
1-Palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine
- SBD:
-
Sphingolipid-binding domain
- Serotonin:
-
5-Hydroxytryptamine
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Acknowledgments
This work was supported by the Council of Scientific and Industrial Research, India (A.C.), and Centre National de la Recherche Scientifique, France (J.F.). Y.D.P. was the recipient of a Postdoctoral Fellowship from a CSIR Network project on Nanomaterials and Nanodevices (NWP0035). P.S. thanks the Council of Scientific and Industrial Research for the award of a Senior Research Fellowship. A.C. is an Adjunct Professor at the Special Centre for Molecular Medicine of Jawaharlal Nehru University (New Delhi, India) and Indian Institute of Science Education and Research (Mohali, India), and Honorary Professor of the Jawaharlal Nehru Centre for Advanced Scientific Research (Bangalore, India). A.C. gratefully acknowledges support from J.C. Bose Fellowship (Department of Science and Technology, Govt. of India). We thank Sourav Haldar for helpful discussion and members of A.C.’s research group for critically reading the manuscript.
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Chattopadhyay, A., Paila, Y.D., Shrivastava, S., Tiwari, S., Singh, P., Fantini, J. (2012). Sphingolipid-Binding Domain in the Serotonin1A Receptor. In: Sudhakaran, P., Surolia, A. (eds) Biochemical Roles of Eukaryotic Cell Surface Macromolecules. Advances in Experimental Medicine and Biology, vol 749. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-3381-1_19
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