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14-September-2008 18:02:42 - receptor Schematic diagram of the formyl peptide receptor 1. Transmembrane helices of the receptor are represented by blue-green cylinders while the cell membrane in which the receptor is imbedded is depicted in yellow. The extracellular face of the cell membrane is on top while the intracellular cytoplasmic face is on the bottom. Extracellular loops of the FPR responsible for N-for-Met-Leu-Phe Nfor-MLF binding are shown in red. Schematic diagram of the formyl peptide receptor 1. Transmembrane helices of the receptor are represented by blue-green cylinders while the cell membrane in which the receptor is imbedded is depicted in yellow. The extracellular face of the cell membrane is on top while the intracellular cytoplasmic face is on the bottom. Extracellular loops of the FPR responsible for N-for-Met-Leu-Phe Nfor-MLF binding are shown in red. formyl peptide receptor 1 Identifiers Symbol FPR1 Entrez 2357 HUGO 3826 OMIM 136537 RefSeq NM_002029 UniProt P21462 Other data Locus Chr. 19 q13.41 formyl peptide receptor-like 1 Identifiers Symbol FPRL1 Entrez 2358 HUGO 3827 OMIM 136538 RefSeq NM_001462 UniProt P25090 Other data Locus Chr. 19 q13.3-13.4 formyl peptide receptor-like 2 Identifiers Symbol FPRL2 Entrez 2359 HUGO 3828 OMIM 136539 RefSeq NM_002030 UniProt P25089 Other data Locus Chr. 19 q13.3-13.4 The formyl peptide receptors FPR are a members of a class of G protein-coupled receptors involved in chemotaxis.1 These receptors where originally identified by their ability to bind N-formyl peptides such as N-formylmethionine produced by the degradation of either bacterial or host cells.23 Hence formyl peptide receptors are involved in mediating immune cell response to infection. These receptors may also act to suppress the immune system under certain conditions.4 Contents 1 Structure - function 2 Signaling pathways 3 References 4 See also 5 External links Structure - function The formyl peptide receptor FPR belongs to the class of serpentine receptors, possessing seven hydrophobic transmembrane domains. The conformation of the FPR is stabilized by several interactions. These include potential salt bridge formation between Arg84-Arg205, Lys85-Arg205, and Lys85-Asp284 which help determine the three-dimensional structure of transmembrane domains, as well as positively charged residues Arg, Lys which interact with negatively charged phosphates. Furthermore residue Arg163 may interact with the ligand binding pocket of the second extracellular loop of the FPR. With respect to binding of the formyl Met-Leu-Phe peptide, there are additional potential interactions which include hydrogen bonding interactions between Arg84 and Lys85 of the first extracellular loop and the N-formly group of the ligand as well as the peptide backbone of formyl Met-Leu-Phe which can form similar interactions. The formyl-Met moiety of the ligand was shown to form disulfide bridges with Cys residues, and an interaction with Arg163 was also demonstrated. It is important to mention that some interaction which stabilize the conformation of the receptor may also influence ligand-binding. Some oligopeptides were also described as characteristic constituents linked to Asn-s of the extracellular N terminal part and to the ligand binding pocket of the second extracellular loop. These components can also determine or make more specific the ligand-receptor interaction.5 Signaling pathways Induction of FPR triggers multiple changes in eukaryotic cells including rearrangement of the cytoskeleton which in turn facilitates cell migration and the synthesis of chemokines. Important FPR regulated pathways include: G protein dependent activation of phospholipase C PLC which results in the breakdown of the membrane constituent phospholipid, phosphatidylinositol 4,5-bisphosphate PIP2 into phosphatidylinositol 3,4,5-trisphosphate IP3 and diacyl glycerol DAG. IP3 is one of the most effective inducer of Ca2+ increase from cytoplasmic pools and from outside the cell via opening Ca2+ channels. DAG in turn is an inducer of protein kinase C PKC. Activation of the regulatory small GTPase, RAS. The active RAS can in turn activate RAF, a Ser/Thr kinase. In the next step mitogen-activated protein kinases MAP kinases are activated. Also known as extracellular signal-regulated kinases - ERKs or MAP/ERK kinase MEK. As a result of the last step, ERK1 and ERK2 are activated. The phosphorylated forms of ERKs can continue the cascade by triggering activation more interacting kinases which results in altered transcriptional activity in the nucleus. Ligand binding to FPR can also induce the activation of CD38, an ectoenzyme of the surface membrane. As a result of activation NAD+ molecules will enter the cytoplasm. NAD+ is converted into cyclic ADP ribose cADPR, a second messenger which interacts with ryanodine receptors RyR on the surface of the rough endoplasmic reticulum. The overal result of the process is increased cytoplasmic Ca2+ levels via the direct pathway described above and also via indirect pathways such as opening of Ca2+ channels in the cell membrane. The sustained increase of Ca2+ is required for directed migration of the cells.6 Formyl peptide receptor FPR signaling pathways. Formyl peptide receptor FPR signaling pathways. References ^ Migeotte I, Communi D, Parmentier M 2006. Formyl peptide receptors: a promiscuous subfamily of G protein-coupled receptors controlling immune responses. Cytokine Growth Factor Rev. 17 6: 501-19. doi:10.1016/j.cytogfr.2006.09.009. PMID 17084101. ^ Le Y, Murphy PM, Wang JM 2002. Formyl-peptide receptors revisited. Trends Immunol. 23 11: 541-8. doi:10.1016/S1471-49060202316-5. PMID 12401407. ^ Panaro MA, Acquafredda A, Sisto M, Lisi S, Maffione AB, Mitolo V 2006. Biological role of the N-formyl peptide receptors. Immunopharmacology and immunotoxicology 28 1: 103-27. doi:10.1080/08923970600625975. PMID 16684671. ^ Braun MC, Wang JM, Lahey E, Rabin RL, Kelsall BL 2001. Activation of the formyl peptide receptor by the HIV-derived peptide T-20 suppresses interleukin-12 p70 production by human monocytes. Blood 97 11: 3531-6. doi:10.1182/blood.V97.11.3531. PMID 11369647. ^ Lala A, Gwinn M, De Nardin E 1999. Human formyl peptide receptor function role of conserved and nonconserved charged residues. Eur. J. Biochem. 264 2: 495-9. doi:10.1046/j.1432-1327.1999.00647.x. PMID 10491096. ^ Partida-Sánchez S, Cockayne DA, Monard S, Jacobson EL, Oppenheimer N, Garvy B, Kusser K, Goodrich S, Howard M, Harmsen A, Randall TD, Lund FE 2001. Cyclic ADP-ribose production by CD38 regulates intracellular calcium release, extracellular calcium influx and chemotaxis in neutrophils and is required for bacterial clearance in vivo. Nat. Med. 7 11: 1209-16. doi:10.1038/nm1101-1209. PMID 11689885. See also Chemotaxis Receptors External links IUPHAR GPCR Database - Formylpeptide receptors MeSH Formyl+peptide+receptor v d e Transmembrane receptor: G protein-coupled receptors Class A: Rhodopsin like Adrenergic α1 A, B, D, α2 A, B, C, β1, β2, β3 Eicosanoid CysLT 1, 2, LTB4 1, 2, FPRL1, OXE, Prostaglandin DP, EP 1, 2, 3, 4, PGF, Prostacyclin, Thromboxane Neuropeptide B/W 1, 2, FF 1, 2, S, Y 1, 2, 4, 5 Orphan GPR 1, 3, 4, 6, 12, 15, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27, 31, 32, 33, 34, 35, 37, 39, 42, 44, 45, 50, 52, 55, 61, 62, 63, 65, 68, 75, 77, 78, 79, 82, 83, 84, 85, 87, 88, 92, 101, 103, 119, 120, 132, 135, 139, 141, 142, 146, 148, 149, 150, 151, 152, 153, 160, 161, 162, 171, 172, 173, 174, 176, 177, 182 Purinergics Adenosine A1, A2a, A2b, A3, P2Y, 1, 2, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14 Serotonin all but 5-HT3 5-HT1 A, B, D, E, F, 5-HT2 A, B, C, 5-HT 4, 5A, 6, 7 Other Acetylcholine M1, M2, M3, M4, M5 - Adrenomedullin - Anaphylatoxin C3a, C5a - Angiotensin 1, 2 - Apelin - Bile acid - Bombesin BRS3, GRPR, NMBR - Bradykinin B1, B2 - Cannabinoid CB1, CB2 - Chemokine - Cholecystokinin A, B - Dopamine D1, D2, D3, D4, D5 - EBI2 - Endothelin A, B - Estrogen - Formyl peptide 1, L1, L2 - Free fatty acid 1, 2, 3, 4 - FSH - Galanin 1, 2, 3 - Gonadotropin-releasing hormone 1, 2 - Ghrelin - Histamine H1, H2, H3, H4 - Kisspeptin - Luteinizing hormone/choriogonadotropin - Lysophospholipid 1, 2, 3, 4, 5, 6, 7, 8 - MAS 1, 1L, D, E, F, G, X1, X2, X3, X4 - Melanocortin 1, 2, 3, 4, 5 - MCHR 1, 2 - Melatonin 1A, 1B- Motilin - neuromedin B, U 1, 2 - Neurotensin 1, 2 - Opioid Delta, Kappa, Mu, Nociceptin, but not Sigma - Olfactory - Opsin 3, 4, 5, 1LW, 1MW, 1SW, RGR, RRH - Orexin 1, 2 - Oxytocin - Oxoglutarate - PAF - Prokineticin 1, 2 - Prolactin-releasing peptide - Protease-activated 1, 2, 3, 4 - Relaxin 1, 2, 3, 4 - Somatostatin 1, 2, 3, 4, 5 - SREB - Succinate - TAAR 1, 2, 3, 5, 6, 8, 9 - Tachykinin 1, 2, 3 - Thyrotropin - Thyrotropin-releasing hormone - Urotensin-II - Vasopressin 1A, 1B, 2 Class B: Secretin like Brain-specific angiogenesis inhibitor 1, 2, 3 - Cadherin 1, 2, 3 - Calcitonin - CD97 - Corticotropin-releasing hormone 1, 2 - EMR 1, 2, 3 - Glucagon GR, GIPR, GLP1R, GLP2R - Growth hormone releasing hormone - PACAPR1- GPR 56, 64, 97, 98, 110, 111, 112, 113, 114, 115, 116, 123, 124, 125, 126, 128, 133, 143, 144, 157 - Latrophilin 1, 2, 3, ELTD1 - Parathyroid hormone 1, 2 - Secretin - Vasoactive intestinal peptide 1, 2 Class C: Metabotropic glutamate / pheromone Calcium-sensing receptor - GABA B 1, 2 - Glutamate receptor Metabotropic glutamate 1, 2, 3, 4, 5, 6, 7, 8 - GPRC6A - GPR 156, 158, 179 - RAIG 1, 2, 3, 4 - Taste receptors TAS1R 1, 2, 3 TAS2R 1, 3, 4, 5, 8, 9, 10, 12, 13, 14, 16, 38, 39, 40, 41, 43, 44, 45, 46, 47, 48, 49, 50 Frizzled / Smoothened Frizzled 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 - Smoothened v d e Transmembrane receptors: immune receptors Cytokine receptor Type I Interleukins 2, 3, 4, 5, 6, 7, 9, 11, 12, 13, 15, 21, 23, 27, CSF receptors EPO, GM-CSF, G-CSF, GH, prolactin, Oncostatin M,Leukemia inhibitory factor - common subunits Common gamma chain, common beta chain, CSF2RB Type II Interleukins 10, 20, 22, 28 - interferon -α/β, -γ Ig superfamily CSF1, C-kit, IL-1, IL-18 TNF CD27, CD30, CD40, CD120, Lymphotoxin β Chemokines IL-8 α, β, CCR1,CXCR4 Other IL-17, TGF-beta 1, 2 Pattern recognition/Toll-like TLR 1 - TLR 2 - TLR 3 - TLR 4 - TLR 5 - TLR 6 - TLR 7 - TLR 8 - TLR 9 - TLR 10 Fc receptor ε FcεRI, FcεRII γ FcγRI, FcγRII, FcγRIII, Neonatal α/μ FcαRI, Fcα/μR Lymphocyte homing receptor CD44 - L-selectin - integrin VLA-4, LFA-1 other Antigen receptor B-cell, T cell - Complement - Formyl peptide - Immunophilins - Integrin - Killer-cell immunoglobulin-like - Scavenger Retrieved from http://en..org/wiki/Formyl_peptide_receptor Categories: Genes on chromosome 19 | Cell signaling | Signal transduction | G protein coupled receptorsHidden category: Protein pages needing a picture Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page This page was last modified on 7 June 2008, at 16:10
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