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Gutierrez MG, Mansfield KS, Malmstadt N. The Functional Activity of the Human Serotonin 5-HT1A Receptor Is Controlled by Lipid Bilayer Composition. Biophys J 2017; 110:2486-2495. [PMID: 27276266 DOI: 10.1016/j.bpj.2016.04.042] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Accepted: 04/22/2016] [Indexed: 01/08/2023] Open
Abstract
Although the properties of the cell plasma membrane lipid bilayer are broadly understood to affect integral membrane proteins, details of these interactions are poorly understood. This is particularly the case for the large family of G protein-coupled receptors (GPCRs). Here, we examine the lipid dependence of the human serotonin 5-HT1A receptor, a GPCR that is central to neuronal function. We incorporate the protein in synthetic bilayers of controlled composition together with a fluorescent reporting system that detects GPCR-catalyzed activation of G protein to measure receptor-catalyzed oligonucleotide exchange. Our results show that increased membrane order induced by sterols and sphingomyelin increases receptor-catalyzed oligonucleotide exchange. Increasing membrane elastic curvature stress also increases this exchange. These results reveal the broad dependence that the 5-HT1A receptor has on plasma membrane properties, demonstrating that membrane lipid composition is a biochemical control parameter and highlighting the possibility that compositional changes related to aging, diet, or disease could impact cell signaling functions.
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Affiliation(s)
- M Gertrude Gutierrez
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California
| | - Kylee S Mansfield
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California
| | - Noah Malmstadt
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California.
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Guo JJ, Yang DP, Tian X, Vemuri VK, Yin D, Li C, Duclos RI, Shen L, Ma X, Janero DR, Makriyannis A. 17β-estradiol (E2) in membranes: Orientation and dynamic properties. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1858:344-53. [PMID: 26607010 DOI: 10.1016/j.bbamem.2015.11.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 11/16/2015] [Accepted: 11/18/2015] [Indexed: 11/27/2022]
Abstract
Non-genomic membrane effects of estrogens are of great interest because of the diverse biological activities they may elicit. To further our understanding of the molecular features of the interaction between estrogenic hormones and membrane bilayers, we have determined the preferred orientation, location, and dynamic properties of 17β-estradiol (E2) in two different phospholipid membrane environments using (2)H-NMR and 2D (1)H-(13)C HSQC in conjunction with molecular dynamics simulations. Unequivocal spectral assignments to specific (2)H labels were made possible by synthesizing six selectively deuterated E2 molecules. The data allow us to conclude that the E2 molecule adopts a nearly "horizontal" orientation in the membrane bilayer with its long axis essentially perpendicular to the lipid acyl-chains. All four rings of the E2 molecule are located near the membrane interface, allowing both the E2 3-OH and the 17β-OH groups to engage in hydrogen bonding and electrostatic interactions with polar phospholipid groups. The findings augment our knowledge of the molecular interactions between E2 and membrane bilayer and highlight the asymmetric nature of the dynamic motions of the rigid E2 molecule in a membrane environment.
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Affiliation(s)
- Jason J Guo
- Center for Drug Discovery, Department of Pharmaceutical Sciences, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA; Department of Chemistry and Chemical Biology, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA.
| | - De-Ping Yang
- Physics Department, College of the Holy Cross, 1 College Street, Worcester, MA 01610, USA
| | - Xiaoyu Tian
- Center for Drug Discovery, Department of Pharmaceutical Sciences, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA; Department of Chemistry and Chemical Biology, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA
| | - V Kiran Vemuri
- Center for Drug Discovery, Department of Pharmaceutical Sciences, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA; Department of Chemistry and Chemical Biology, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA
| | - Dali Yin
- Center for Drug Discovery, Department of Pharmaceutical Sciences, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA; Department of Chemistry and Chemical Biology, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA
| | - Chen Li
- Center for Drug Discovery, Department of Pharmaceutical Sciences, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA; Department of Chemistry and Chemical Biology, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA
| | - Richard I Duclos
- Center for Drug Discovery, Department of Pharmaceutical Sciences, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA; Department of Chemistry and Chemical Biology, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA
| | - Lingling Shen
- Center for Drug Discovery, Department of Pharmaceutical Sciences, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA; Department of Chemistry and Chemical Biology, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA
| | - Xiaoyu Ma
- Center for Drug Discovery, Department of Pharmaceutical Sciences, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA; Department of Chemistry and Chemical Biology, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA
| | - David R Janero
- Center for Drug Discovery, Department of Pharmaceutical Sciences, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA; Department of Chemistry and Chemical Biology, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA
| | - Alexandros Makriyannis
- Center for Drug Discovery, Department of Pharmaceutical Sciences, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA; Department of Chemistry and Chemical Biology, Northeastern University, 360 Huntington Avenue, Boston, MA 02115-5000, USA.
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Batchelor R, Windle CJ, Buchoux S, Lorch M. Cholesterol and lipid phases influence the interactions between serotonin receptor agonists and lipid bilayers. J Biol Chem 2010; 285:41402-11. [PMID: 20961857 DOI: 10.1074/jbc.m110.155176] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Solid state NMR techniques have been used to investigate the effect that two serotonin receptor 1a agonists (quipazine and LY-165,163) have on the phase behavior of, and interactions within, cholesterol/phosphocholine lipid bilayers. The presence of agonist, and particularly LY-165,163, appears to widen the phase transitions, an effect that is much more pronounced in the presence of cholesterol. It was found that both agonists locate close to the cholesterol, and their interactions with the lipids are modulated by the lipid phases. As the membrane condenses into mixed liquid-ordered/disordered phases, quipazine is pushed up toward the surface of the bilayer, whereas LY-165,163 moves deeper into the lipid chain region. In light of our results, we discuss the role of lipid/drug interactions on drug efficacy.
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Affiliation(s)
- Rebecca Batchelor
- Department of Chemistry, University of Hull, Hull HU6 7RX, United Kingdom and
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Fantini J, Barrantes FJ. Sphingolipid/cholesterol regulation of neurotransmitter receptor conformation and function. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2009; 1788:2345-61. [PMID: 19733149 DOI: 10.1016/j.bbamem.2009.08.016] [Citation(s) in RCA: 168] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2009] [Revised: 07/17/2009] [Accepted: 08/28/2009] [Indexed: 10/20/2022]
Abstract
Like all other monomeric or multimeric transmembrane proteins, receptors for neurotransmitters are surrounded by a shell of lipids which form an interfacial boundary between the protein and the bulk membrane. Among these lipids, cholesterol and sphingolipids have attracted much attention because of their well-known propensity to segregate into ordered platform domains commonly referred to as lipid rafts. In this review we present a critical analysis of the molecular mechanisms involved in the interaction of cholesterol/sphingolipids with neurotransmitter receptors, in particular acetylcholine and serotonin receptors, chosen as representative members of ligand-gated ion channels and G protein-coupled receptors. Cholesterol and sphingolipids interact with these receptors through typical binding sites located in both the transmembrane helices and the extracellular loops. By altering the conformation of the receptors ("chaperone-like" effect), these lipids can regulate neurotransmitter binding, signal transducing functions, and, in the case of multimeric receptors, subunit assembly and subsequent receptor trafficking to the cell surface. Several sphingolipids (especially gangliosides) also exhibit low/moderate affinity for neurotransmitters. We suggest that such lipids could facilitate (i) the attachment of neurotransmitters to the post-synaptic membrane and in some cases (ii) their subsequent delivery to specific protein receptors. Overall, various experimental approaches provide converging evidence that the biological functions of neurotransmitters and their receptors are highly dependent upon sphingolipids and cholesterol, which are active partners of synaptic transmission. Several decades of research have been necessary to untangle the skein of a complex network of molecular interactions between neurotransmitters, their receptors, cholesterol and sphingolipids. This sophisticated crosstalk between all four distinctive partners may allow a fine biochemical tuning of synaptic transmission.
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Affiliation(s)
- Jacques Fantini
- Centre de Recherche en Neurobiologie et Neurophysiologie de Marseille (CRN2M), University of Aix-Marseille 2 and Aix-Marseille 3, CNRS UMR 6231, INRA USC 2027, Faculté des Sciences de St. Jérôme, Laboratoire des Interactions Moléculaires et Systèmes Membranaires, Marseille, France
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