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Revision as of 19:06, 21 April 2016
Glucagon G protein coupled receptor
G protein coupled receptors (GPCRs) are the largest class of integral membrane proteins. GPCRs are divided into five families; the rhodopsin family (class A), the secretin family (class B), the glutamate family (class C), the frizzled/taste family (class F), and the adhesion family.[1] Roughly 5% of the human genome encodes g-protein-coupled receptors, which are responsible for the transduction of endogenous signals and the instigation of cellular responses. All GPCRs contain a similar seven α-helical transmembrane domain (TMD or 7TMD) that once bound to its ligand, undergoes a conformational change and tranduces a signal to coupled, heterotrimeric G proteins. The initiation of intracellular signal pathways occur in response to stimuli such as light, Ca2+, amino acids, nucleotides, odorants, peptides, and other proteins, and accomplishes many interesting physiological roles. [1] Class B GPCRs contain 15 distinct receptors for peptide hormones and generate their signal pathway through the activation of adenylate cyclase (AC) which increases the intracellular concentration of cAMP, inositol phosphate, and calcium levels. [2] These secondary messengers are essential elements of intracellular signal cascades for human diseases including type II diabetes mellitus, osteoporosis, obesity, cancer, neurological degeneration, cardiovascular diseases, headaches, and psychiatric disorders; making their regulation through drug targeting of particular interest as disease targets. [3] Structural approaches to the development of agonists and antagonists have however been hampered by the lack of accurate Class B TMD visualizations. Recent crystal structures of corticoptropin-releasing factor receptor 1 and human glucagon were accomplished through x-ray crystallography. [4] [5]
Glucagon ReceptorThe glucagon class B GPCR (GCGR) is involved in glucose homeostasis through the binding of the signal peptide glucagon. See also PSI Structural Biology Database Glucagon is released from pancreatic α-cells when blood glucose levels fall after a period of fasting or several hours following intake of dietary carbohydrates.[6] Once the peptide hormone is released, it binds to GCGR, a 485 amino acid protein found in the liver, kidney, intestinal smooth muscle, brain, and adipose tissues. [7] Upon binding, signaling is initiated to heterotrimeric G-proteins containing Gαs. [8] GCGR can regulate additional signal pathways, including G-proteins of the Gαi family through the adoption of differing receptor conformations. [9] Glucagon's main role is the regulation of blood glucose levels. Glucagon lowers the concentration of fructose 2,6-bisphosphate which is an allosteric inhibitor of the gluconeogenic enzyme fructose 1,6-bisphosphotase and activates phosphofructose kinase 1, which increases glucose levels via glycolysis. Glucagon is also a regulator of the production of cholesterol, which is an energetically intensive process. When energy resources are low, downregulation of cholesterol production begins with glucagon binding to GCGR, which stimulates the phosphorylation of HMG-CoA.[6] HMG-CoA is inactivated by phosphorylation and moderates cholesterol production to conserve energy. Glucagon also takes part in fatty acid mobilization by affecting levels of adipose tissue in the organism. Activation of GCGR by glucagon initiates triacylglycerol breakdown and the phosphorylation of perilipin and lipases via cAMP signal pathways. This allows the body to export fatty acids to the liver and other crucial tissues for energy use and makes more glucose available for use in brain functioning. [6]
Structural ConsiderationsThe class B GPCRs, of which GCGR is a member, are different from other Class A GPCRs in several ways. The first is that class B GPCRs contain a protrusion known as a 'stalk,' which is a three α-helical turn elongation of the N-terminus that protrudes past the extracellular (EC) membrane. Structural integrity of this domain in GCGR is essential to ligand binding affinity. (Fig's 1 and 2)
Secondly, the extracellular loop 1 (ECL1) is 3-4 times longer than comparable loops in class A GPCRs, and also affects ligand binding affinity. (Fig. 3)[5] Most notably, class B GPCRs contain a prominent central splay (Fig. 4) which is solvent filled and accessible from the extracellular side. This central splay is notably absent from class A GPCRs (Fig. 5) , represents a tantalizing target for agonists/antagonists, and is the focus of much current research into GCGR signal regulation. [3]  The snake plot (Fig. 6) shows the conservation and effects of mutagenesis in the 7TMD structure of class B human GPCR. The highly conserved amino acids imply an importance to that functioning of the individual residues and their interactions. The amino acids which have a great impact on the function of the receptor are highlighted in teal, yellow, and black, and offer evidence that the position and interaction of the amino acid is crucial for protein function. Most of the residues that play an important role in glucagon binding face the main cavity of the 7TM structure. Mutagenesis in these positions highly compromises the functioning of the glucagon binding. Functions of Glucagon receptor (GCGR)It has been discovered that the large, soluble N-terminal extracellular domains (ECD) of GCGR are primary in ligand selectivity with the deep, ligand pocket (Fig. 7) of the TMD providing secondary recognition. [7] Because of the difficulty of stabilizing and crystallizing Class B TMDs, very little is known about the conformational changes that transduce cell signals endogenously. It is known that GCGR can regulate additional signal pathways including G-proteins of the Gαi family through the adoption of differing receptor conformations. Research is ongoing. [9] GCGR generates downstream signals predominantly through the increase of intracellular cAMP, however there are other pathways being uncovered that are the result of GCGR adopting multiple, active conformations. Researchers are currently investigating how receptor activity-modifying proteins (RAMPs) interact with the ligand and GCGR in which the signaling bias of the receptor is altered. [10] GPCR activity is regularly quantified by ligand binding affinity, potency, efficacy, and kinetics. These measurement are used to measure drug ligand interactions in vivo. Recently, GPCRs have been crystallized and catalogued, which tend to include a need to stabilize the receptor, emphasizing the instability of the G coupled protein receptor. Zhang et. al. imply the importance of receptor folding in the cell membrane, in the human class B GPCR the 7TM portion, for receptor stability and function. [11]
Essential, conserved residues of glucagon, as discovered through mutagenesis and photo cross-linking studies have been labeled and colored in red. [5] Through mutagenesis and photo-crosslinking studies, several residues deep within the central cavity of the GCGR 7TMD were discovered neighboring Glu362, which is approximately 19 angstroms from the base of the EC stalk and the location of Tyr138. (Fig. 8)
Four essential residues exist deep within the central cavity which all play strong roles in ligand binding affinity. (Fig. 9)
A narrow entry gives way to a large, anchoring site for residues 1-4 of glucagon. (Fig. 10) Essential to glucagon's binding, a long, N-terminal tail winds to a clump of 4 residues, culminating in bulge that fits into the central, anchoring site of the 7TMD. (Fig. 11)   Clinical relevanceClass B secretin-like receptors have gained relevance in therapeutics and drug targets. Maintaining information about the class B GPCRs conformational flexibility, allows for a better understanding of the receptor-ligand binding and its pharmaceutical relevance. The 7TM structure offers a direct connect between the extracellular and intracellular region, which offers a mechanism for signal transduction within the cell. GPCRs regulate cellular processes as required by the organs in which they are located. GPCR’s are used in the functioning of neuron synapses, ion transport regulation, homeostasis, cell division, and cell morphology. Mutations in the GPCR have been linked with retinitis pigmentosa, female infertility, nephrogenic diabetes insipidus, and familial exudative vitreoretinopathy. [12] A variety of small molecule modulators have been developed over the past several years providing the promise of enhanced pharmaceutical regulation of GCGR. [7](Fig's. 12 and 13)   Utilizing the visualizations of the GCGR 7TMD and glucagon peptide ligand, dimensional/structural analyses can be performed to develop models for novel molecules of increasing specificity for GCGR binding/regulation. Performing a dimensional analysis between the binding pocket and the base of the EC stalk, a large pseudopeptide molecule of 17-24 angstroms in size could be utilized to mimic the characteristics of GCGR's natural ligand, glucagon. (Fig's. 14 and 15) See AlsoPSI Structural Biology Database Wikipedia: G protein-coupled receptors
References
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