Search results for "Melanocortin 3 receptor"

showing 4 items of 4 documents

Unusual genomic structure: melanocortin receptors in Fugu.

2005

The melanocortin (MC) receptors are found in five subtypes in mammals and chicken, while recent studies have shown that the Fugu (Takifugu rubripes) genome has only four MC receptors and the zebrafish genome has six subtypes. The MC3 receptor seems to be missing from the two closely related pufferfishes, Fugu and Tetraodon (Tetraodon nigroviridis). The MC2 and MC5 receptors in the pufferfish have introns. Moreover, these two receptors are found in a tandem that is remarkably conserved in several vertebrate species. Here, we speculate about the genomic origin of the MC receptors.

Geneticsmedicine.medical_specialtyGenomebiologyTakifugu rubripesFuguGeneral NeuroscienceReceptors MelanocortinfungiSequence Analysis DNATetraodon nigroviridisbiology.organism_classificationGeneral Biochemistry Genetics and Molecular BiologyMelanocortin 3 receptorTakifuguEndocrinologyHistory and Philosophy of ScienceInternal medicinemedicineAnimalsMelanocortinReceptorTetraodonG protein-coupled receptorAnnals of the New York Academy of Sciences
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Functional characterization of two melanocortin (MC) receptors in lamprey showing orthology to the MC1 and MC4 receptor subtypes

2007

Abstract Background The melanocortin (MC) receptors have a key role in regulating body weight and pigmentation. They belong to the rhodopsin family of G protein-coupled receptors (GPCRs). The purpose of this study was to identify ancestral MC receptors in agnathan, river lamprey. Results We report cloning of two MC receptors from river lamprey. The lamprey receptors, designated MCa and MCb, showed orthology to the MC1 and MC4 receptor subtypes, respectively. The molecular clock analysis suggested that lamprey MC receptor genes were not duplicated recently and diverged from each other more than 400 MYR ago. Expression and pharmacological characterization showed that the lamprey MCa receptor …

Pro-OpiomelanocortinSecond Messenger SystemsGene DuplicationProtein Interaction MappingCyclic AMPPetromyzonReceptorPhylogenyCell Line TransformedSkinGeneticsbiologyReceptors MelanocortinMelanocortin 3 receptorCell biologyOrgan SpecificityRhodopsinReceptor Melanocortin Type 4HagfishesMelanocortinReceptor Melanocortin Type 1Protein BindingResearch ArticleEvolutionRecombinant Fusion ProteinsMolecular Sequence DataBinding CompetitivePeptides CyclicEvolution Moleculargamma-MSHAdrenocorticotropic HormoneSpecies SpecificityMelanocortin receptorbeta-MSHQH359-425AnimalsHumansAmino Acid SequenceEcology Evolution Behavior and SystematicsGene LibraryG protein-coupled receptorBinding SitesSequence Homology Amino AcidFuguLampreybiology.organism_classificationPeptide FragmentsVisceraalpha-MSHbiology.proteinCosyntropinSequence Alignmenthuman activitiesBMC Evolutionary Biology
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Pharmacological Characterization of Melanocortin Receptors in Fish Suggests an Important Role for ACTH

2005

The melanocortin (MC) receptor subtypes have distinctive characteristic binding profiles. We found that the trout and Fugu MC4 receptors have similar affinity for alpha-MSH and beta-MSH and a much higher affinity for ACTH than does the human MC4 receptor. The Fugu MC1 and the trout and Fugu MC5 receptors also have higher affinity for ACTH-derived peptides than alpha-, beta-, or gamma-MSH. It is tempting to speculate that ACTH-derived peptides may have played an important role as "original" ligands at the MC receptors, while the specificity of the different subtypes for the alpha-, beta-, and gamma-MSH peptides may have appeared at later stages during vertebrate evolution.

endocrine systemmedicine.medical_specialtyanimal structuresAlpha (ethology)BiologyGeneral Biochemistry Genetics and Molecular BiologyAdrenocorticotropic HormoneHistory and Philosophy of ScienceInternal medicinemedicineAnimalsHumansACTH receptorReceptorBeta (finance)G protein-coupled receptorintegumentary systemFuguReceptors MelanocortinGeneral NeurosciencefungiFishesMelanocortin 3 receptorCell biologyEndocrinologyMelanocortinhormones hormone substitutes and hormone antagonistsProtein BindingAnnals of the New York Academy of Sciences
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New Melanocortin 1 Receptor Binding Motif Based on the C-Terminal Sequence of ?-Melanocyte-Stimulating Hormone

2006

The C-terminal tripeptide of the alpha-melanocyte stimulating hormone (alpha-MSH11-13) possesses strong antiinflammatory activity without known cellular target. In order to better understand the structural requirements for function of such motif, we designed, synthesized and tested out Trp- and Tyr-containing analogues of the alpha-MSH11-13. Seven alpha-MSH11-13 analogues were synthesized and characterized for their binding to the melanocortin receptors recombinantly expressed in insect (Sf9) cells, infected with baculovirus carrying corresponding MC receptor DNA. We also tested these analogues on B16-F1 mouse melanoma cells endogenously expressing the MC1 receptor for binding and for abili…

medicine.medical_specialtyGrowth-hormone-releasing hormone receptorProtein ConformationAmino Acid MotifsMelanoma ExperimentalBiologyToxicologyBinding CompetitiveMiceThyrotropin-releasing hormone receptorInternal medicineChlorocebus aethiopsmedicineEnzyme-linked receptorAnimalsHumansACTH receptorMelanocyte-Stimulating HormonesReceptorPharmacologyGeneral MedicineMelanocortin 3 receptorCell biologyEndocrinologyCOS CellsEstrogen-related receptor gammaMelanocortinReceptor Melanocortin Type 1Basic <html_ent glyph="@amp;" ascii="&"/> Clinical Pharmacology <html_ent glyph="@amp;" ascii="&"/> Toxicology
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