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Role of Lipid-Mediated Effects in β2-Adrenergic Receptor Dimerization

  • Xavier Prasanna
  • Amitabha ChattopadhyayEmail author
  • Durba SenguptaEmail author
Conference paper
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 842)

Abstract

G protein-coupled receptors (GPCRs) are an important family of mammalian membrane proteins whose function has been shown to be modulated by membrane lipid composition. The β2-adrenergic receptor is one of the most well characterized GPCRs. Structural characterization of the β2-adrenergic receptor and other related receptors has revealed putative lipid binding sites. In addition, indirect lipid effects, such as hydrophobic mismatch, have also been implicated in receptor function and organization. Despite these advances in understanding the receptor in the membrane environment, our understanding of the protein-lipid interactions remains limited. Here, we have used MARTINI coarse-grain molecular dynamics simulations to explore receptor-lipid interactions of the β2-adrenergic receptor. We analyze the indirect membrane effects such as hydrophobic mismatch and correlate its role in driving receptor association. We also study direct receptor-lipid interactions and identify a novel lipid binding site. The sites of increased receptor-lipid interactions, could play an important role in modulating receptor association. Our results provide novel insights into the correlation between direct and indirect lipid effects with GPCR organization. We believe these results constitute an important step in understanding GPCR organization and dynamics in the cell membrane.

Keywords

GPCR MARTINI coarse-grain simulation Membrane effect Receptor dimerization 

Notes

Acknowledgements

This work was supported by the Council of Scientific and Industrial Research, Govt. of India. D.S. gratefully acknowledges the support of the Ramalingaswami Fellowship from the Department of Biotechnology, Govt. of India. X.P. thanks the University Grants Commission (India) for the award of a Junior Research Fellowship. A.C. gratefully acknowledges J.C. Bose Fellowship (Department of Science and Technology, Govt. of India). A.C. is an Adjunct Professor at the Special Centre for Molecular Medicine of Jawaharlal Nehru University (New Delhi) and Indian Institute of Science Education and Research (Mohali), and Honorary Professor of the Jawaharlal Nehru Centre for Advanced Scientific Research (Bangalore). We acknowledge the CSIR Fourth Paradigm Institute (Bangalore) and the Multi-Scale Simulation and Modeling project - MSM (CSC0129) for computational time.

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.CSIR-National Chemical LaboratoryCouncil of Scientific and Industrial ResearchPuneIndia
  2. 2.CSIR-Centre for Cellular and Molecular BiologyCouncil of Scientific and Industrial ResearchHyderabadIndia

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