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Structural Analysis of Leukotriene B4 (LBT4) Receptor (BLT1 AND BLT2) Antagonists. Pharm Chem J 2014. [DOI: 10.1007/s11094-014-1102-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Affiliation(s)
- Motonao Nakamura
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, The University of Tokyo, Hongo, Tokyo, Japan.
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Arcemisbéhère L, Sen T, Boudier L, Balestre MN, Gaibelet G, Detouillon E, Orcel H, Mendre C, Rahmeh R, Granier S, Vivès C, Fieschi F, Damian M, Durroux T, Banères JL, Mouillac B. Leukotriene BLT2 receptor monomers activate the G(i2) GTP-binding protein more efficiently than dimers. J Biol Chem 2009; 285:6337-47. [PMID: 20026606 DOI: 10.1074/jbc.m109.083477] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Accumulating evidence indicates that G protein-coupled receptors can assemble as dimers/oligomers but the role of this phenomenon in G protein coupling and signaling is not yet clear. We have used the purified leukotriene B(4) receptor BLT2 as a model to investigate the capacity of receptor monomers and dimers to activate the adenylyl cyclase inhibitory G(i2) protein. For this, we overexpressed the recombinant receptor as inclusion bodies in the Escherichia coli prokaryotic system, using a human alpha(5) integrin as a fusion partner. This strategy allowed the BLT2 as well as several other G protein-coupled receptors from different families to be produced and purified in large amounts. The BLT2 receptor was then successfully refolded to its native state, as measured by high-affinity LTB(4) binding in the presence of the purified G protein G alpha(i2). The receptor dimer, in which the two protomers displayed a well defined parallel orientation as assessed by fluorescence resonance energy transfer, was then separated from the monomer. Using two methods of receptor-catalyzed guanosine 5'-3-O-(thio)triphosphate binding assay, we clearly demonstrated that monomeric BLT2 stimulates the purified G alpha(i2) beta(1) gamma(2) protein more efficiently than the dimer. These data suggest that assembly of two BLT2 protomers into a dimer results in the reduced ability to signal.
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Affiliation(s)
- Laure Arcemisbéhère
- CNRS UMR 5203, Institut de Génomique Fonctionnelle, Département de Pharmacologie Moléculaire, Montpellier, France
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Xie YP, Li BG, Luo YG, Chen XZ, Zhang GL. Preparation of Two Diastereoisomeric Decalin Synthons and (−)-Ambrox. Helv Chim Acta 2008. [DOI: 10.1002/hlca.200890074] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Ando K. Synthesis of 2-, 4- and 5-(2-Alkylcarbamoyl-1-methylvinyl)-7-alkyloxybenzo[ b]furans and their Leukotriene B 4 Receptor Antagonistic Activity. YAKUGAKU ZASSHI 2005; 125:863-74. [PMID: 16272807 DOI: 10.1248/yakushi.125.863] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Variable 7-carboxylpropoxy or (1-phenyl)ethoxybenzo[b]furan derivatives with (E)- and (Z)-2-alkylcarbamoyl-1-methylvinyl groups at the 2-, 4-, and 5-positions were prepared to find novel and selective leukotriene B(4) (LTB(4)) receptor antagonists. (E)-2-(2-Diethylcarbamoyl-1-methylvinyl)-7-(1-phenylethoxy)benzo[b]furan (4v) showed selective inhibition of the human BLT(2) receptor (hBLT(2)). On the other hand, (E)-2-acetyl-4-(2-diethylcarbamoyl-1-methylvinyl)-7-(1-phenylethoxy)benzo[b]furan (7c) inhibited both human BLT(1) receptor (hBLT(1)) and hBLT(2). The (E)-2-(2-diethylcarbamoyl-1-methylvinyl) group lay on approximately the same plane as the benzo[b]furan ring, whereas the (E)-4-(2-diethylcarbamoyl-1-methylvinyl) group had a torsion angle (45.7 degrees ) from the benzo[b]furan ring plane. However, the (Z)-(2-alkylcarbamoyl-1-methylvinyl)benzo[b]furans were inactive. The inhibitory activity depended on the conformation of the 2-alkylcarbamoyl-1-methylvinyl groups.
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Affiliation(s)
- Kumiko Ando
- Faculty of Pharmaceutical Sciences, Mukogawa Women's University, Nishinomiya, Japan.
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Ando K, Tsuji E, Ando Y, Kunitomo JI, Kobayashi R, Yokomizo T, Shimizu T, Yamashita M, Ohta S, Nabe T, Kohno S, Ohishi Y. Synthesis of 2-, 4- and 5-(2-alkylcarbamoyl-1-methylvinyl)-7-alkyloxybenzo[b]furans and their leukotriene B4 receptor antagonistic activity. Org Biomol Chem 2005; 3:2129-39. [PMID: 15917901 DOI: 10.1039/b503615a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Variable benzo[b]furan derivatives having (E)- and (Z)-2-alkylcarbamoyl-1-methylvinyl groups at the 2-, 4- and 5-positions and a carboxylpropoxy or (1-phenyl)ethoxy group at the 7-position were prepared to find novel and selective leukotriene B4(LTB4) receptor antagonists. (E)-2-(2-diethylcarbamoyl-1-methylvinyl)-7-(1-phenylethoxy)benzo[b]furan (4v) showed selective inhibition to the human BLT2 receptor (hBLT2). On the other hand, (E)-2-acetyl-4-(2-diethylcarbamoyl-1-methylvinyl)-7-(1-phenylethoxy)benzo[b]furan (7v) inhibited both human BLT(1) receptor (hBLT1) and hBLT2. The (E)-2-(2-diethylcarbamoyl-1-methylvinyl) group lay on approximately the same plane as the benzo[b]furan ring, whereas the (E)-4-(2-diethylcarbamoyl-1-methylvinyl) group had the torsion angle (45.7 degree) from the benzo[b]furan ring plane. However, the (Z)-(2-alkylcarbamoyl-1-methylvinyl)benzo[b]furans were inactive. The inhibitory activity depended on the conformation of the 2-diethylcarbamoyl-1-methylvinyl group.
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Affiliation(s)
- Kumiko Ando
- School of Pharmaceutical Sciences, Mukogawa Women's University, 11-68 Koshien Kyuban-cho, Nishinomiya 663-8179, Japan
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Mesnier D, Banères JL. Cooperative conformational changes in a G-protein-coupled receptor dimer, the leukotriene B(4) receptor BLT1. J Biol Chem 2004; 279:49664-70. [PMID: 15358776 DOI: 10.1074/jbc.m404941200] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We have used an isolated receptor, the leukotriene B(4) receptor BLT1, to analyze the mechanism of receptor activation in a G-protein-coupled receptor dimer. The isolated receptor is essentially a dimer whether the agonist is present or not, provided the detergent used stabilizes the inactive dimeric assembly. We have produced a receptor mutant where Cys(97) in the third transmembrane domain has been replaced by a serine. This mutation leads to an approximately 100-fold decrease in the affinity for the agonist. 5-Hydroxytryptophan has then been introduced at position 234 in the C97A mutant sixth transmembrane domain. Agonist binding to the labeled receptor is associated with variations in the fluorescence properties of 5-hydroxytryptophan due to specific agonist-induced conformational changes. The C97A mutant labeled with 5-hydroxytryptophan has then been associated with a wild-type receptor in a dimeric complex that has been subsequently purified. The purified complex activates its G-protein partner in a similar manner as the wild-type homodimer. Due to the difference in the affinity for the agonist between the wild-type and mutant protomers in this dimer, we have been able to reach a state where one of the protomers, the mutant, is in its unliganded state, whereas the other, the wild type, is loaded with the agonist. We show that agonist binding to the wild-type receptor induces specific changes in the conformation of the unliganded protomer, as evidenced by the variations in the emission of the 5-hydroxytryptophan residue in the mutant receptor. These data provide a direct demonstration for agonist-induced cooperative conformational changes in a GPCR dimer.
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Affiliation(s)
- Danielle Mesnier
- UMR 5074 CNRS, Chimie Biomoléculaire et Interactions Biologiques, Faculté de Pharmacie, 15 Av. Ch. Flahault, BP 14491, 34093 Montpellier Cedex 5, France
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Banères JL, Parello J. Structure-based analysis of GPCR function: evidence for a novel pentameric assembly between the dimeric leukotriene B4 receptor BLT1 and the G-protein. J Mol Biol 2003; 329:815-29. [PMID: 12787680 DOI: 10.1016/s0022-2836(03)00439-x] [Citation(s) in RCA: 226] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
We produced human leukotriene B(4) (LTB(4)) receptor BLT1 as a recombinant protein in Escherichia coli. This detergent-solubilized receptor displays two states with regard to its affinity for LTB(4): (i) a low-affinity state (K(a)=7.8x10(8)M(-1)) that involves a receptor homodimer (BLT1.LTB(4))(2); we report evidence for a central role of the sixth transmembrane helix in regulating the stability of this homodimer; (ii) a high-affinity state (K(a)=1.3x10(10)M(-1)) upon interaction of the receptor with the heterotrimeric GDP-loaded G-protein, Galpha(i2)beta(1)gamma(2). Association of the G-protein with recombinant BLT1 induces GDP-GTP exchange by the Galpha subunit. These results indicate that isolated BLT1 is fully representative of the in vivo receptor with regard to high-affinity recognition of LTB(4), association with a G-protein and activation of Galpha. Using a combination of mass spectrometry after chemical cross-linking and neutron-scattering in solution with the native complex, we establish unambiguously that only one G-protein trimer binds to a receptor dimer to form the stoichiometrically defined (BLT1.LTB(4))(2):Galpha(i2)beta(1)gamma(2) pentameric assembly. This suggests that receptor dimerization could be crucial to transduction of the LTB(4)-induced signal.
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Affiliation(s)
- Jean-Louis Banères
- UMR 5074 CNRS, Chimie Biomoléculaire et Interactions Biologiques, Faculté de Pharmacie, 15 avenue Ch. Flahault, BP 14491, 34093 Cedex 05, Montpellier, France.
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Baneres JL, Martin A, Hullot P, Girard JP, Rossi JC, Parello J. Structure-based analysis of GPCR function: conformational adaptation of both agonist and receptor upon leukotriene B4 binding to recombinant BLT1. J Mol Biol 2003; 329:801-14. [PMID: 12787679 DOI: 10.1016/s0022-2836(03)00438-8] [Citation(s) in RCA: 126] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We produced the human leukotriene B(4) (LTB(4)) receptor BLT1, a G-protein-coupled receptor, in Escherichia coli with yields that are sufficient for the first structural characterization of this receptor in solution. Overexpression was achieved through codon optimization and the search for optimal refolding conditions of BLT1 recovered from inclusion bodies. The detergent-solubilized receptor displays a 3D-fold compatible with a seven transmembrane (TM) domain with ca 50% alpha-helix and an essential disulfide bridge (circular dichroism evidence); it binds LTB(4) with K(a)=7.8(+/-0.2)x10(8)M(-1) and a stoichiometric ratio of 0.98(+/-0.02). Antagonistic effects were investigated using a synthetic molecule that shares common structural features with LTB(4). We report evidence that both partners, LTB(4) and BLT1, undergo a rearrangement of their respective conformations upon complex formation: (i) a departure from planarity of the LTB(4) conjugated triene moiety; (ii) a change in the environment of Trp234 (TM-VI helix) and in the exposure of the cytoplasmic region of this transmembrane helix.
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Affiliation(s)
- Jean-Louis Baneres
- UMR 5074 CNRS, Chimie Biomoléculaire et Interactions Biologiques, Faculté de Pharmacie, 15 Avenue Ch. Flahault, BP 14491, 34093, Cedex 05, Montpellier, France.
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Durand D, Hullot P, Vidal JP, Girard JP, Banères JL, Parello J, Muller A, Bonne C, Rossi JC. Leukotriene B4 photoaffinity probes: design, synthesis and evaluation of new arylazide-1,3-disubstituted cyclohexanes. Bioorg Med Chem Lett 2000; 10:811-4. [PMID: 10782692 DOI: 10.1016/s0960-894x(00)00103-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The synthesis and the binding affinities of new leukotriene B4 receptor photoaffinity probes, where a 1,3-disubstituted cyclohexane ring replaces the conjugated delta6,7 and delta8,9 double bonds of the natural eicosanoid, are described. One enantiomeric compound, 4b alpha, is specifically cross-linked upon photolysis to the recombinant leukotriene B4 receptor from human origin (h-BLTR) solubilized in a micellar medium. This probe appears as a good candidate for identifying the ligand binding site of this receptor.
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Affiliation(s)
- D Durand
- Laboratoire de Chimie Biomoléculaire et des Interactions Biologiques, UPRESA-CNRS 5074, Faculté de Pharmacie, Montpellier, France
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