An15N NMR Spin Relaxation Dispersion Study of the Folding of a Pair of Engineered Mutants of Apocytochromeb562

2005 ◽  
Vol 127 (14) ◽  
pp. 5066-5072 ◽  
Author(s):  
Wing-Yiu Choy ◽  
Zheng Zhou ◽  
Yawen Bai ◽  
Lewis E. Kay
Keyword(s):  
Spin Relaxation ◽  
Relaxation Dispersion ◽  
Nmr Spin Relaxation

Proton Spin Relaxation of a Liquid Crystal with a Glassy Cholesteric State

1990 ◽  
Vol 45 (9-10) ◽  
pp. 1077-1084 ◽  
Author(s):  
D. Pusiol ◽  
F. Noack ◽  
C. Aguilera
Keyword(s):  
Spin Relaxation ◽  
Rotational Diffusion ◽  
Glassy State ◽  
Larmor Frequency ◽  
Proton Spin ◽  
Relaxation Dispersion ◽  
Proton Relaxation ◽  
Relaxation Processes ◽  
Molecular Reorientation ◽  
Cholesteric Phase

Abstract Field-cycling and standard pulsed NMR techniques have been used to study the frequency dependence of the longitudinal proton spin relaxation time T x in the crystalline estradiol compound (+)3,1,7-ß-bis-(4n-butoxybenzoyloxy)-estra-1,3,5-(10)-trien or BET, which is a mesogenic material with a chiral molecular structure. From the measured Larmor frequency and temperature depen-dences we conclude that, at low NMR frequencies in the cholesteric phase, T1 reflects in addition to the relaxation process familiar from nematic liquid crystals (director fluctuation modes) another slow mechanism theoretically predicted for cholesteric systems, namely diffusion induced rotational molecular reorientation. These relaxation processes are not or much less effective in the crystalline and glassy state, where they are frozen. Also the high NMR frequency relaxation dispersion strongly differs between the cholesteric mesophase and the not liquid crystalline samples. This is interpreted by a change from essentially translational self-diffusion to rotational diffusion controlled proton relaxation.

Active site dynamics in NADH oxidase from Thermus thermophilus studied by NMR spin relaxation

2011 ◽  
Vol 51 (1-2) ◽  
pp. 71-82 ◽  
Author(s):  
Teresa Miletti ◽  
Patrick J. Farber ◽  
Anthony Mittermaier
Keyword(s):  
Spin Relaxation ◽  
Active Site ◽  
Nadh Oxidase ◽  
Thermus Thermophilus ◽  
Nmr Spin Relaxation

Broadband Dynamics of Ubiquitin by Anionic and Cationic Nanoparticle Assisted NMR Spin Relaxation

2020 ◽  
Vol 133 (1) ◽  
pp. 150-154
Author(s):  
Stacey Wardenfelt ◽  
Xinyao Xiang ◽  
Mouzhe Xie ◽  
Lei Yu ◽  
Lei Bruschweiler‐Li ◽  
...  
Keyword(s):  
Spin Relaxation ◽  
Nmr Spin Relaxation

scholarly journals Effects of Hydrogen Bonding on the Rotational Dynamics of Water-Like Molecules in Liquids: Insights from Molecular Dynamics Simulations

2020 ◽  
Vol 73 (8) ◽  
pp. 734
Author(s):  
W. A. Monika Madhavi ◽  
Samantha Weerasinghe ◽  
Konstantin I. Momot
Keyword(s):  
Molecular Dynamics ◽  
Hydrogen Bonding ◽  
Hydrogen Sulfide ◽  
Spin Relaxation ◽  
Rotational Diffusion ◽  
Molecular Geometry ◽  
Md Simulations ◽  
Water Molecules ◽  
Molecular Reorientation ◽  
Nmr Spin Relaxation

Rotational motion of molecules plays an important role in determining NMR spin relaxation properties of liquids. The textbook theory of NMR spin relaxation predominantly uses the assumption that the reorientational dynamics of molecules is described by a continuous time rotational diffusion random walk with a single rotational diffusion coefficient. Previously we and others have shown that reorientation of water molecules on the timescales of picoseconds is not consistent with the Debye rotational-diffusion model. In particular, multiple timescales of molecular reorientation were observed in liquid water. This was attributed to the hydrogen bonding network in water and the consequent presence of collective rearrangements of the molecular network. In order to better understand the origins of the complex reorientational behaviour of water molecules, we carried out molecular dynamics (MD) simulations of a liquid that has a similar molecular geometry to water but does not form hydrogen bonds: hydrogen sulfide. These simulations were carried out at T=208K and p=1 atm (~5K below the boiling point). Ensemble-averaged Legendre polynomial functions of hydrogen sulfide exhibited a Gaussian decay on the sub-picosecond timescale but, unlike water, did not exhibit oscillatory behaviour. We attribute these differences to hydrogen sulfide’s absence of hydrogen bonding.

The eigenmode perspective of NMR spin relaxation in proteins

2013 ◽  
Vol 139 (22) ◽  
pp. 225104 ◽  
Author(s):  
Yury E. Shapiro ◽  
Eva Meirovitch
Keyword(s):  
Spin Relaxation ◽  
Nmr Spin Relaxation

General Theoretical/Computational Tool for Interpreting NMR Spin Relaxation in Proteins

2009 ◽  
Vol 113 (41) ◽  
pp. 13613-13625 ◽  
Author(s):  
Mirco Zerbetto ◽  
Antonino Polimeno ◽  
Eva Meirovitch
Keyword(s):  
Spin Relaxation ◽  
Computational Tool ◽  
Nmr Spin Relaxation
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