title: Conformational flexibility of luteinizing hormone-releasing hormone in aqueous solution. A carbon-13 spin-lattice relaxation time study.
abstract: The carbon-13 nuclear magnetic resonance (13C NMR) spectra of luteinizing hormone-releasing hormone (LH-RH) and lower homologous peptides have been assigned in aqueous solutions at various pH values. 13C spin-lattice relaxation times (T1) have been measured for all proton-bearing carbons at 25.2 and 67.9 MHz. From the T1 data the rates of overall molecular motion and intramolecular motion of side chains have been estimated. LH-RH is a flexible molecule in solution, having segmental motion along the backbone as well as in the nonaromatic side chains.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D004578:Electron Spin Resonance Spectroscopy; D005583:Fourier Analysis; D007987:Gonadotropin-Releasing Hormone; D009682:Magnetic Resonance Spectroscopy; D010446:Peptide Fragments; D011487:Protein Conformation
chemical_list: D010446:Peptide Fragments; D007987:Gonadotropin-Releasing Hormone