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Structure and Function of G Protein Coupled Receptors

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TLDR
This review summarizes the current knowledge of the molecular mechanisms by which the GPC-Rs activate second messenger systems, and it addresses their regulation and structure.
Abstract
The G protein coupled receptors (GPC-Rs) comprise a large superfamily of genes encoding numerous receptors which all show common structural features, e.g., seven putative membrane spanning domains. Their biological functions are extremely diverse, ranging from vision and olfaction to neuronal and endocrine signaling. The GPC-Rs couple via multiple G proteins to a growing number of recognized second messenger pathway, e.g., cAMP and phosphatidyl inositol turnover. This review summarizes our current knowledge of the molecular mechanisms by which the GPC-Rs activate second messenger systems, and it addresses their regulation and structure.

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Citations
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Structure of a nanobody-stabilized active state of the β2 adrenoceptor

TL;DR: A camelid antibody fragment to the human β2 adrenergic receptor is generated, and an agonist-bound, active-state crystal structure of the receptor-nanobody complex is obtained, providing insights into the process of agonist binding and activation.
Journal ArticleDOI

International Union of Basic and Clinical Pharmacology. LXXXI. Nomenclature and Classification of Adenosine Receptors—An Update

TL;DR: In the 10 years since the previous International Union of Basic and Clinical Pharmacology report on the nomenclature and classification of adenosine receptors, no developments have led to major changes in the recommendations, but there have been so many other developments that an update is needed.
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G Protein-Coupled Receptor Allosterism and Complexing

TL;DR: It is proposed that the study of allosteric phenomena will become of progressively greater import to the drug discovery process due to the advent of newer and more sensitive GPCR screening technologies.
Journal ArticleDOI

Agonist-bound adenosine A2A receptor structures reveal common features of GPCR activation

TL;DR: Two crystal structures of the thermostabilized human adenosine A2A receptor bound to its endogenous agonistAdenosine and the synthetic agonist NECA are presented, indicating that the contraction of the ligand-binding pocket caused by the inward motion of helices 3, 5 and 7 may be a common feature in the activation of all GPCRs.
References
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Journal ArticleDOI

Model for the structure of bacteriorhodopsin based on high-resolution electron cryo-microscopy.

TL;DR: A complete atomic model for bacteriorhodopsin between amino acid residues 8 and 225 has been built and suggests that pK changes in the Schiff base must act as the means by which light energy is converted into proton pumping pressure in the channel.
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GTPase inhibiting mutations activate the α chain of G s and stimulate adenylyl cyclase in human pituitary tumours

TL;DR: A subset of growth hormone-secreting human pituitary tumours carries somatic mutations that inhibit GTPase activity of a G protein α chain, αs, which results in the activation of adenylyl cyclase, which bypasses the cells' normal requirement for trophic hormone.
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A point mutation of the rhodopsin gene in one form of retinitis pigmentosa

TL;DR: A C→A transversion in codon 23 (corresponding to a proline →histidine substitution) in 17 of 148 unrelated patients and not in any of 102 unaffected individuals indicates that this mutation could be the cause of one form of autosomal dominant retinitis pigmentosa.
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Roles of G protein subunits in transmembrane signalling.

TL;DR: A family of proteins called G proteins couples cell surface receptors to a variety of enzymes and ion channels, and an important question is how signals remain specific as they cross the cell membrane.
Journal ArticleDOI

Chimeric alpha 2-,beta 2-adrenergic receptors: delineation of domains involved in effector coupling and ligand binding specificity

TL;DR: The alpha 2 and beta 2 adrenergic receptors, both of which are activated by epinephrine, but which can be differentiated by selective drugs, have opposite effects on the adenylyl cyclase system.
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