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Bernardini L, Moretti-Rojas I, Brush M, Rojas FJ, Balmaceda JP. Status of hCG/LH Receptor and G Proteins in Human Endometrium During Artificial Cycles of Hormone Replacement Therapy. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/107155769500200409] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
| | | | - Michael Brush
- Department of Obstetrics and Gynecology, University of California, Irvine, Orange, California; Hitachi Chemical Research Center, Irvine, California
| | - Francisco J. Rojas
- Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, University of California, Irvine, P.O. Box 14091, Orange, CA 92613-1491; Hitachi Chemical Research Center, Irvine, California
| | - Jose P. Balmaceda
- Department of Obstetrics and Gynecology, University of California, Irvine, Orange, California; Hitachi Chemical Research Center, Irvine, California
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2
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Saxena BB, Landesman R, Gupta GN, Singh M, Rathnam P, Dattatreyamurty B. New approaches in fertility regulation. J OBSTET GYNAECOL 2009. [DOI: 10.3109/01443618409073720] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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3
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Hao M, Rathnam P, Saxena B. Expression of a recombinant bifunctional protein from a chimera of human lutropin receptor and human chorionic gonadotropin beta-subunit. J Reprod Immunol 2005; 63:123-35. [PMID: 15380943 DOI: 10.1016/j.jri.2004.07.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2004] [Revised: 07/09/2004] [Accepted: 07/14/2004] [Indexed: 10/26/2022]
Abstract
Human lutropin (hLH) and human chorionic gonadotropin (hCG) are structurally and functionally similar and play important roles in reproduction via a common gonadal receptor (LH-R). However, hormone specific hCG-beta subunit contains 24 additional amino acid carboxyl terminal peptide (CTP), which produce specific antibodies to hCG-beta with little cross-reaction with LH. A chimeric protein containing both hLH-R and hCG-beta would provide a unique bifunctional antigen for immunocontraception. In this study is described the synthesis of a chimeric DNA construct of full-length of hLH-receptor and hCG-beta and its expression in Sf9 cells to produce a bifunctional protein. Recombinant protein was recognized by antibodies to LH-R as well as anti-hCG-beta in Western Blots, thus indicating the preservation of immunological epitopes for both hLH-R and hCG-beta in the chimera. Specific ligand binding of recombinant hLH-R component was demonstrated by the displacement of bound labeled hCG at increasing concentrations of unlabeled hCG, indicating that, the presence of hCG-beta component of the chimera did not interfere with the binding of hCG to LH-R. hCG-beta was also present in the recombinant chimeric protein as shown by a specific hCG-beta chemiluminescence assay. Treatment of transfected Sf9 cells with hCG induced dose-dependent increase in the stimulation of intracellular cAMP production, which showed that the ligand binding had functional activity. These results demonstrate that the chimeric DNA construct of hLHR-hCG-beta expressed a bifunctional protein containing both hLH-R and hCG-beta activities, which could provide a unique potential antigen for immunocontraception in vertebrates.
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Affiliation(s)
- Meirong Hao
- Division of Reproductive Endocrinology, Department of OB-GYN, Weill Medical College of Cornell University, New York, NY 10021, USA
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4
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Sperbeck SJ, Song DY, LaBarbera AR. Solubilization and characterization of high affinity follicle-stimulating hormone receptors from porcine granulosa cells. JOURNAL OF RECEPTOR RESEARCH 1993; 13:925-42. [PMID: 8510071 DOI: 10.3109/10799899309073701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Follicle-stimulating hormone (FSH)-receptors were solubilized from immature porcine ovarian granulosa cells with retention of high affinity 125I-porcine FSH-binding activity. The optimal concentration of Triton X-100 for solubilization was 0.5% (w/v), and the optimal cellular protein concentration 25 mg/ml. Glycerol (30%) increased recovery of solubilized receptor. 125I-pFSH-binding affinity ranged from 4 x 10(10) M-1 to 8 x 10(10) M-1 in either the absence or presence of glycerol. 125I-pFSH-binding capacity was 5 fmol/mg protein in the absence of glycerol and 58 fmol/mg protein in the presence of glycerol as determined by equilibrium saturation binding analysis. By gel permeation chromatography, the apparent size of the 125I-pFSH-receptor complex was 462 kDa in the absence of glycerol and 762 kDa in the presence of glycerol. Ligand blotting of solubilized receptor yielded a single species with an apparent molecular weight of 200 kDa under nonreducing conditions and a single species with an apparent molecular weight of 60 kDa under reducing conditions. These studies indicated that high affinity FSH-binding activity can be solubilized from membranes of immature porcine granulosa.
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Affiliation(s)
- S J Sperbeck
- Department of Obstetrics and Gynecology, University of Cincinnati College of Medicine, OH 45267-0526
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5
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Pal R, Talwar GP, Saxena A, Sam MG, Rathnam P, Saxena BB. Biological actions of monoclonal antibodies to bovine lutropin receptor. J Reprod Immunol 1992; 22:87-103. [PMID: 1522565 DOI: 10.1016/0165-0378(92)90008-r] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Monoclonal antibodies (Mabs) were produced against bovine Lutropin receptor (LH-R). Antibodies were detected by an enzyme linked immunosorbant assay (ELISA). Hybridomas were subcloned to achieve monoclonality. Ascites were developed in Balb/c mice. Hybridoma supernatants were purified by ammonium sulfate precipitation and chromatography on hydroxylapatite columns. LH-R antibodies showed upto 50% inhibition of 125I-labeled hCG binding to bovine luteal cell membranes and up to 80% inhibition of testosterone production by hCG stimulated mouse Leydig cells. LH-R antibodies were predominantly IgM isotype. Purified antibodies showed a 78-kDa band, in SDS-PAGE, as the heavy chain of the immunoglobulin. LH-R antibodies were localized specifically in the thecal and luteal cells of the rat ovaries as well as in the Leydig cell of mouse testes. Injections of the LH-R antibody caused a constant estrus in normal rats. One month after the cessation of the injections the animals returned to normal estrus cycle and fertility. Pregnant mice injected with LH-R antibodies produced only 3 viable pregnancies and 10 pups, as compared to 8 pregnancies and 45 pups born to normal controls. LH-R antibodies also caused, approximately, a 50% reduction in testosterone production in normal male rats. These observations indicate a high degree of specificity of the Mab to LH-R and their potential in studies on gonadal function.
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Affiliation(s)
- R Pal
- National Institute of Immunology, New Delhi, India
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6
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Reichert LE, Dattatreyamurty B, Grasso P, Santa-Coloma TA. Structure--function relationships of the glycoprotein hormones and their receptors. Trends Pharmacol Sci 1991; 12:199-203. [PMID: 1650508 DOI: 10.1016/0165-6147(91)90547-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The primary structures of the glycoprotein hormones follitropin (FSH), lutropin (LH), human choriogonadotropin (hCG) and thyrotropin (TSH) have been determined, hCG has been crystallized and initial diffraction data obtained. Studies with synthetic peptides have provided information on regions involved in receptor interaction and signal transduction. The receptors for the glycoprotein hormones have been prepared by gene cloning methods and their primary structures deduced. As Leo Reichert and colleagues discuss here, although cAMP is involved in glycoprotein hormone signal transduction, recent evidence also implicates other second messengers, especially Ca2+ and may include both the phosphatidylinositol pathway and activation of Ca2+ channels.
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Affiliation(s)
- L E Reichert
- Department of Biochemistry, Albany Medical College, NY 12208
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7
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Alpaugh K, Indrapichate K, Abel JA, Rimerman R, Wimalasena J. Purification and characterization of the human ovarian LH/hCG receptor and comparison of the properties of mammalian LH/hCG receptors. Biochem Pharmacol 1990; 40:2093-103. [PMID: 2242036 DOI: 10.1016/0006-2952(90)90240-l] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Methods previously published by us [Wimalasena et al., J Biol Chem 260: 10689-10697, 1985; Wimalasena et al., J Biol Chem 261: 9416-9420, 1986] were utilized to solubilize the human corpus luteal leuteinizing hormone/human chorionic gonadotropin (LH/hCG) receptor with 3-[(3-cholamide-propyl)dimethylammonio]-1-propanesulfonate (CHAPS) and to purify the receptor by two steps of hCG-Sepharose affinity chromatography. The specific binding capacity (SBC) of the purified human receptor was 7510 pmol/mg protein, and KA = 2.2 x 10(9) M-1 when iodo hCG was competed by hCG; the yield was 4-7% of starting activity. When hLH was used in competition with hCG, specific binding capacity was 7900 pmol/mg protein and KA 1.0 x 10(9) M-1. Silver staining and autoradiography demonstrated a single protein of Mr 78,000 under reducing and Mr 58-62 x 10(3) under nonreducing conditions. Rat ovarian LH/hCG receptor was purified by similar methods and the KA of 3.5 x 10(10) M-1 for hCG was substantially different from the KA for hLH which was 2.1 x 10(9) M-1. Mr of the rat protein was 78-82 x 10(3) (reduced) and 58-62 x 10(3) (nonreduced) when analyzed by silver staining and autoradiography. For the first time, human LH/hCG receptor has been purified to apparent homogeneity, and its Mr of 78,000 was essentially identical to the Mr values of purified rat and porcine receptors.
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Affiliation(s)
- K Alpaugh
- Department of Physiology, University of Nebraska Medical Center, Omaha 68105
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9
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Boniface JJ, Reichert LE. Evidence for a novel thioredoxin-like catalytic property of gonadotropic hormones. Science 1990; 247:61-4. [PMID: 2104678 DOI: 10.1126/science.2104678] [Citation(s) in RCA: 83] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
It has been proposed that dithiol-disulfide interchange and oxidation-reduction reactions may play a role in hormone-induced receptor activation. Inspection of the sequences of the gonadotropic hormones revealed a homologous tetrapeptide (Cys-Gly-Pro-Cys) between the beta subunit of lutropin (LH) and the active site of thioredoxin (TD). The beta subunit of follitropin (FSH) has a similar sequence (Cys-Gly-Lys-Cys). Thioredoxin is a ubiquitous protein serving as an electron donor for ribonucleotide reductase, but it also exhibits disulfide isomerase activity. The catalytic activity of TD was assayed by its ability to reactivate reduced and denatured ribonuclease. In this assay, the purified ovine FSH and bovine LH preparations tested were approximately 60 and approximately 300 times, respectively, as active as TD on a molar basis. This heretofore unsuspected catalytic property of FSH and LH may be important in understanding their mechanism of receptor activation and signal transduction.
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Affiliation(s)
- J J Boniface
- Department of Biochemistry, Albany Medical College, NY 12208
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11
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Affiliation(s)
- I Ji
- Department of Biochemistry, University of Wyoming, Laramie 82071
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12
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Joshi LR, Boland SR, Hewlett EL, Katz MS. Inhibition of adenylate cyclase from luteinized rat ovary by monovalent cations: roles of the stimulatory guanine nucleotide-binding regulatory component and stimulatory hormone receptor. Arch Biochem Biophys 1988; 261:134-47. [PMID: 3124764 DOI: 10.1016/0003-9861(88)90112-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Sodium and other monovalent cations (added as chloride salts) inhibited adenylate cyclase of luteinized rat ovary. Sodium chloride (150 mM) inhibited basal enzyme activity by 20%. Sodium chloride inhibition was enhanced to 34-54% under conditions of enzyme stimulation by guanine nucleotides (GTP and its nonhydrolyzable analog 5'-guanylyl imidodiphosphate), fluoride anion, and agonists (ovine luteinizing hormone (oLH) and the beta-adrenergic catecholamine isoproterenol) acting at stimulatory receptors linked to adenylate cyclase. Sodium chloride inhibition was dependent on salt concentration over a wide range (25-800 mM) as well as the concentrations of GTP and oLH. Inhibition by NaCl was of rapid onset and appeared to be reversible. The order of inhibitory potency of monovalent cations was Li+ greater than Na+ greater than K+. The role of individual components of adenylate cyclase in the inhibitory action of monovalent cations was examined. Exotoxins of Vibrio cholerae and Bordetella pertussis were used to determine respectively the involvement of the stimulatory and inhibitory guanine nucleotide-binding regulatory components (Ns and Ni) in NaCl inhibition. Sodium chloride inhibited cholera toxin-activated adenylate cyclase activity by 29%. Ni did not appear to mediate cation inhibition of adenylate cyclase because pertussis toxin did not attenuate inhibition by NaCl. Enzyme stimulation by agents (forskolin and Mn2+) thought to activate the catalytic component directly was not inhibited by NaCl but was instead significantly enhanced. Sodium chloride (150 mM) increased both the Kd for high-affinity binding of oLH to 125I-human chorionic gonadotropin binding sites and the Kact for oLH stimulation of adenylate cyclase by sevenfold. In contrast, NaCl had no appreciable effect on either isoproterenol binding to (-)-[125I]iodopindolol binding sites or the Kact for isoproterenol stimulation of adenylate cyclase. The results suggest that in luteinized rat ovary monovalent cations uncouple, or dissociate, Ns from the catalytic component and, in a distinct action, reduce gonadotropin receptor affinity for hormone. Dissociation of the inhibitory influence of Ni from direct catalytic activation could account for NaCl enhancement of forskolin- and Mn2+-associated activities. On the basis of these results, the spectrum of divergent stimulatory and inhibitory effects of monovalent cations on adenylate cyclase activities in a variety of tissues may be interpreted in terms of differential enzyme susceptibilities to cation-induced uncoupling of N and catalytic component functions.
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Affiliation(s)
- L R Joshi
- Department of Medicine, University of Texas Health Science Center, San Antonio
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Rebois RV, Bradley RM, Titlow CC. Hydrodynamic properties of the gonadotropin receptor from a murine Leydig tumor cell line are altered by desensitization. Biochemistry 1987; 26:6422-8. [PMID: 3427017 DOI: 10.1021/bi00394a019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The murine Leydig tumor cell line 1 (MLTC-1) contains gonadotropin receptors (GR) that are coupled to adenylate cyclase through the stimulatory guanine nucleotide binding protein (Gs). The binding of human choriogonadotropin (hCG) causes MLTC-1 cells to accumulate cAMP. With time, the ability of MLTC-1 cells to respond to hCG is attenuated by a process called desensitization. The hydrodynamic properties of GR from control and desensitized MLTC-1 cells were studied. Sucrose density gradient sedimentation in H2O and D2O and gel filtration chromatography were used to estimate the Stokes radius (a), partial specific volume (vc), sedimentation coefficient (S20,w), and molecular weight (Mr) of the detergent-solubilized hormone-receptor complex (hCG-GR). [125I]hCG was bound to MLTC-1 cells under conditions that allow (37 degrees C) or prevent (0 degree C) desensitization, and hCG-GR was solubilized in Triton X-100. In the absence of desensitization, control hCG-GR had a Mr of 213,000 (a = 6.2; vc = 0.76; S20,w = 7.3), whereas desensitized hCG-GR had a Mr of 158,000 (a = 6.1; Vc = 0.71; S20,w = 6.6). Deglycosylated hCG (DG-hCG) is an antagonist that binds to GR with high affinity but fails to stimulate adenylate cyclase or cause desensitization. [125I]DG-hCG was bound to MLTC-1 cells and DG-hCG-GR solubilized in Triton X-100. The hydrodynamic properties of DG-hCG-GR (Mr 213,000; a = 5.8; Vc = 0.77; S20;w = 7.6) were the same as that for control hCG-GR. There was no evidence for the association of adenylate cyclase or Gs with GR in Triton X-100 solubilized preparations.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- R V Rebois
- Membrane Biochemistry Section, National Institute of Neurological and Communicative Disorders and Stroke, Bethesda, Maryland 20892
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15
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Dattatreyamurty B, Figgs LW, Reichert LE. Physical and functional association of follitropin receptors with cholera toxin-sensitive guanine nucleotide-binding protein. J Biol Chem 1987. [DOI: 10.1016/s0021-9258(18)60873-7] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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17
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Dufau ML, Kusuda S. Purification and characterization of ovarian LH/hCG and prolactin receptors. JOURNAL OF RECEPTOR RESEARCH 1987; 7:167-93. [PMID: 3625597 DOI: 10.3109/10799898709054985] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
We have purified the luteinizing hormone (LH)/human choriogonadotropin (hCG) receptor to homogeneity by sequential affinity column on wheat germ lectin-Sepharose and hCG-Sepharose. The method was designed to allow also the purification of lactogen receptor from the initial starting material. Comparable purification of lactogen receptor can be attained using Con A-Sepharose as initial step. The purified LH/hCG receptor was identified as a single protein of Mr = 75,000 on SDS gel electrophoresis. The lactogen receptor is composed of two dissimilar active subunits of Mr 88,000 and 40,000, the latter probably being an integral part of the larger form. Comparison of Mr's derived from SDS gels with those from fast performance liquid chromatography suggested that the native LH holoreceptor is present in a dimeric form, while the lactogen receptor seems to be composed of aggregates that could represent dimeric or trimeric forms of holoreceptor Mr 80,000. Cross-linking studies performed after binding of hCG (radiolabeled in the individual subunits) to the purified LH/hCG receptor indicated that the hCG alpha-subunit undergoes predominant interaction with the receptor molecule. The influence of the beta-subunit in this interaction seems to occur mainly through its association with the alpha-subunit, presumably by conferring specificity to the alpha-subunit for its interaction with the receptor. The alpha-subunit, which is identical within species, has an important role in the receptor binding interaction and biological activity of glycoprotein hormones.
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Stormshak F, Zelinski-Wooten MB, Abdelgadir SE. Comparative aspects of the regulation of corpus luteum function in various species. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1987; 219:327-60. [PMID: 3324680 DOI: 10.1007/978-1-4684-5395-9_16] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- F Stormshak
- Department of Animal Science, Oregon State University, Corvallis 97331
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19
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Keinänen KP, Kellokumpu S, Rajaniemi HJ. Visualization of the rat ovarian lutropin receptor by ligand blotting. Mol Cell Endocrinol 1987; 49:33-8. [PMID: 3556749 DOI: 10.1016/0303-7207(87)90061-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A ligand blotting technique was developed to identify the lutropin receptor after size separation by sodium dodecyl sulfate-polyacrylamide gel electrophoresis under nonreducing conditions. The separated proteins were transferred to a nitrocellulose sheet, which was subsequently incubated with 125I-labeled human choriogonadotropin (125I-hCG), and subjected to autoradiography. An Mr 90,000 band was specifically and intensely labeled with 125I-hCG. The band was not observed, when the hormone incubation was performed in the presence of an excess of unlabeled hCG or human lutropin. The presence of rat follitropin or rat prolactin did not, however, abolish the labeling. No specific labeling was found when down-regulated ovarian tissue or rat liver was used as starting material. The Mr 90,000 band disappeared when the protein samples were treated with reducing agent, showing that integrity of receptor disulfide bonds is essential for the hormone-receptor interaction. In addition, a receptor-positive murine Leydig tumor cell line produced an Mr 90,000-92,000 band in ligand blotting, thus demonstrating the similarity between rat and murine lutropin receptors. These results provide strong evidence that the lutropin receptor is an Mr 90,000 protein.
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20
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Immunoprecipitation of the lutropin/choriogonadotropin receptor from biosynthetically labeled Leydig tumor cells. A 92-kDa Glycoprotein. J Biol Chem 1987. [DOI: 10.1016/s0021-9258(19)75951-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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21
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Kusuda S, Dufau ML. Purification and characterization of the rat ovarian receptor for luteinizing hormone. Structural studies of subunit interaction. J Biol Chem 1986. [DOI: 10.1016/s0021-9258(18)66692-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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22
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Dattatreyamurty B, Schneyer A, Reichert LE. Solubilization of functional and stable follitropin receptors from light membranes of bovine calf testis. J Biol Chem 1986. [DOI: 10.1016/s0021-9258(18)69277-4] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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23
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24
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Bruch RC, Thotakura NR, Bahl OP. The rat ovarian lutropin receptor. Purification, hormone binding properties, and subunit composition. J Biol Chem 1986. [DOI: 10.1016/s0021-9258(18)67677-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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25
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Wimalasena J, Abel JA, Wiebe JP, Chen TT. The porcine ovarian luteinizing hormone/human chorionic gonadotropin receptor II. Is the purified receptor an oligomer of identical subunits? J Biol Chem 1986. [DOI: 10.1016/s0021-9258(18)67671-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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26
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Ascoli M, Segaloff DL. Effects of collagenase on the structure of the lutropin/choriogonadotropin receptor. J Biol Chem 1986. [DOI: 10.1016/s0021-9258(17)35719-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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27
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The subunit structure of the follitropin (FSH) receptor. Photoaffinity labeling of the membrane-bound receptor follitropin complex in situ. J Biol Chem 1985. [DOI: 10.1016/s0021-9258(17)38717-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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28
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Ji I, Bock JH, Ji TH. Composition and peptide maps of cross-linked human choriogonadotropin-receptor complexes on porcine granulosa cells. J Biol Chem 1985. [DOI: 10.1016/s0021-9258(17)38950-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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29
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Wimalasena J, Moore P, Wiebe JP, Abel J, Chen TT. The porcine LH/hCG receptor. Characterization and purification. J Biol Chem 1985. [DOI: 10.1016/s0021-9258(19)85138-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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30
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The subunit structure of the follitropin receptor. Chemical cross-linking of the solubilized follitropin-receptor complex. J Biol Chem 1985. [DOI: 10.1016/s0021-9258(17)39200-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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31
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Islam MN, Farid NR. Structure of the porcine thyrotropin receptor: a 200 kilodalton glycoprotein heterocomplex. EXPERIENTIA 1985; 41:18-23. [PMID: 2981700 DOI: 10.1007/bf02005855] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
We have determined that the porcine thyroidal TSH receptor is a glycoprotein heterotetramer composed of two Mr approximately 35,000 (epsilon) covalently linked subunits which interact noncovalently with two copies of delta (Mr 66,000) chains.
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32
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Crine P, Aubry M, Potier M. Incorporation of radiolabeled amino acids into protein subunits of the rat leydig cell gonadotropin receptor: application to the study of receptor structure and turnover. Ann N Y Acad Sci 1984; 438:224-36. [PMID: 6100014 DOI: 10.1111/j.1749-6632.1984.tb38289.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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33
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Necessary PC, Humphrey PA, Mahajan PB, Ebner KE. Purification of rabbit mammary prolactin receptor by acidic elution from a prolactin affinity column. J Biol Chem 1984. [DOI: 10.1016/s0021-9258(17)39819-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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34
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Fishman PH, Bradley RM, Rebois RV, Brady RO. The role of gangliosides in the interaction of human chorionic gonadotropin and cholera toxin with murine Leydig tumor cells. J Biol Chem 1984. [DOI: 10.1016/s0021-9258(17)42889-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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