title: LGR8 signal activation by the relaxin-like factor.
abstract: The relaxin-like factor (RLF) is thought to be responsible for the intra-abdominal migration of the testis during mammalian development. Our latest studies of RLF and LGR8 have revealed that the N-terminal region of the A chain is not required for receptor binding but is indispensable for cyclic AMP generation. RLF derivatives with six residues deleted from the N terminus of the A chain are active, whereas further truncation, up to the first A chain cysteine (A-10), yields tightly binding ligands devoid of signaling activity. These derivatives are specific competitive inhibitors (RLFi) of RLF. Although receptor binding is dependent upon B chain residues, the N-terminal region of the A chain is a generic trigger of the trans-membrane signaling activity.
authors.affiliation: Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston South Carolina 29425, USA. bullesee@musc.edu
authors.forename: Erika E
authors.initials: EE
authors.lastname: Büllesbach
authors.forename: Christian
authors.initials: C
authors.lastname: Schwabe
mesh_terms: D000595:Amino Acid Sequence; D001667:Binding, Competitive; D002460:Cell Line; D002851:Chromatography, High Pressure Liquid; D002942:Circular Dichroism; D000242:Cyclic AMP / Q000378:metabolism; D003545:Cysteine / Q000737:chemistry; D018076:DNA, Complementary / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D006801:Humans; D007328:Insulin / Q000378:metabolism*; D008969:Molecular Sequence Data; D010455:Peptides / Q000737:chemistry; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D011506:Proteins / Q000378:metabolism*; D043562:Receptors, G-Protein-Coupled / Q000737:chemistry* / Q000502:physiology*; D015398:Signal Transduction; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D018076:DNA, Complementary; D007328:Insulin; C084797:Leydig insulin-like protein; D010455:Peptides; D011506:Proteins; C472867:RXFP2 protein, human; D043562:Receptors, G-Protein-Coupled; D000242:Cyclic AMP; D003545:Cysteine