title: [Conformational analysis of a segment in bacterioopsin by two-dimensional (1)H-NMR spectroscopy].
abstract: The spatial structure of a synthetic peptide, an analogue of the membrane spanning segment B (residues 34-65) of bacterioopsin from Halobacterium halobium, has been refined. Backbone torsion angles were derived from intensities of short-range interproton NOEs. These, together with a complete set of the NOEs integral intensities formed the basis for the three-dimensional structure refinement by the energy minimization with consideration of NOE penalty functions. Analysis indicates the right-handed alpha-helical conformation of segment B extending from Asp-38 to Tyr-64 with a kink of the helical axis (27 degrees) at Pro-50. The most stable region with an average root-mean-square deviation of 0.43 A between the backbone atoms includes residues 42-60 in six energy refined structures. The N-terminal part of segment B (residues 34-37) has no ordered conformation. The inferred structure is in close agreement with the electron cryomicroscopy structure of bacteriorhodopsin, differing from it in conformations of most of the side chains.
authors.forename: I V
authors.initials: IV
authors.lastname: Maslennikov
authors.forename: A L
authors.initials: AL
authors.lastname: Lomize
authors.forename: A S
authors.initials: AS
authors.lastname: Arsen'ev
mesh_terms: D000595:Amino Acid Sequence; D001436:Bacteriorhodopsins / Q000737:chemistry*; D019617:Halobacterium salinarum / Q000378:metabolism; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000737:chemistry*; D011487:Protein Conformation
chemical_list: D010446:Peptide Fragments; D001436:Bacteriorhodopsins; C017827:bacterio-opsin
vernacular_title: Konformatsionnyĭ analiz segmenta v bakterioopsina po dannym dvumernoĭspektroskopii (1)H-IaMR.