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Backbone dynamics of a bacterially expressed peptide from the receptor binding domain of Pseudomonas aeruginosa pilin strain PAK from heteronuclear 1H-15N NMR spectroscopy.
Campbell, A P; Spyracopoulos, L; Irvin, R T; Sykes, B D.
Afiliación
  • Campbell AP; Department of Medicinal Chemistry, School of Pharmacy, University of Washington, Seattle 98195, USA. apc@u.washington.edu
J Biomol NMR ; 17(3): 239-55, 2000 Jul.
Article en En | MEDLINE | ID: mdl-10959631
The backbone dynamics of a 15N-labeled recombinant PAK pilin peptide spanning residues 128-144 in the C-terminal receptor binding domain of Pseudomonas aeruginosa pilin protein strain PAK (Lys128-Cys-Thr-Ser-Asp-Gln-Asp-Glu-Gln-Phe-Ile-Pro-Lys-Gly-Cys-Se r-Lys144) were probed by measurements of 15N NMR relaxation. This PAK(128-144) sequence is a target for the design of a synthetic peptide vaccine effective against multiple strains of P. aeruginosa infection. The 15N longitudinal (T1) and transverse (T2) relaxation rates and the steady-state heteronuclear [1H]-15N NOE were measured at three fields (7.04, 11.74 and 14.1 Tesla), five temperatures (5, 10, 15, 20, and 25 degrees C) and at pH 4.5 and 7.2. Relaxation data was analyzed using both the 'model-free' formalism [Lipari, G. and Szabo, A. (1982) J. Am. Chem. Soc., 104, 4546-4559 and 4559-4570] and the reduced spectral density mapping approach [Farrow, N.A., Szabo, A., Torchia, D.A. and Kay, L.E. (1995) J. Biomol. NMR, 6, 153-162]. The relaxation data, spectral densities and order parameters suggest that the type I and type II beta-turns spanning residues Asp134-Glu-Gln-Phe137 and Pro139-Lys-Gly-Cys142, respectively, are the most ordered and structured regions of the peptide. The biological implications of these results will be discussed in relation to the role that backbone motions play in PAK pilin peptide immunogenicity, and within the framework of developing a pilin peptide vaccine capable of conferring broad immunity across P. aeruginosa strains.
Asunto(s)
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Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Fragmentos de Péptidos / Pseudomonas aeruginosa / Resonancia Magnética Nuclear Biomolecular / Proteínas de la Membrana Idioma: En Revista: J Biomol NMR Asunto de la revista: BIOLOGIA MOLECULAR / DIAGNOSTICO POR IMAGEM / MEDICINA NUCLEAR Año: 2000 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Países Bajos
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Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Fragmentos de Péptidos / Pseudomonas aeruginosa / Resonancia Magnética Nuclear Biomolecular / Proteínas de la Membrana Idioma: En Revista: J Biomol NMR Asunto de la revista: BIOLOGIA MOLECULAR / DIAGNOSTICO POR IMAGEM / MEDICINA NUCLEAR Año: 2000 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Países Bajos