title: Measurement of 15N-T1 relaxation rates in a perdeuterated protein by magic angle spinning solid-state nuclear magnetic resonance spectroscopy.
abstract: In this paper, we present the measurement of (15)N-T(1) relaxation times in the solid state for a perdeuterated protein for which exchangeable protons are back substituted during recrystallization using a buffer which contains 10% H(2)O and 90% D(2)O. We find large variations of the (15)N relaxation time, even within the same beta sheet. By comparing (15)N-T(1) relaxation times measured for a protonated and a deuterated protein (using the above mentioned approach), we conclude that (1)H driven (15)N,(15)N spin diffusion has a significant impact on the absolute (15)N relaxation time in protonated proteins. This effect is important for a quantitative analysis of relaxation data in terms of molecular dynamics.
authors.affiliation: Leibniz Institut für Molekulare Pharmakologie (FMP), Robert-Rössle Strasse 10, 13125 Berlin, Germany.
authors.forename: Veniamin
authors.initials: V
authors.lastname: Chevelkov
authors.forename: Anne
authors.initials: A
authors.lastname: Diehl
authors.forename: Bernd
authors.initials: B
authors.lastname: Reif
mesh_terms: D003903:Deuterium / Q000737:chemistry*; D008958:Models, Molecular; D009587:Nitrogen Isotopes / Q000737:chemistry*; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D011522:Protons
chemical_list: D009587:Nitrogen Isotopes; D011522:Protons; D003903:Deuterium