On the calculation of ³Jαβ-coupling constants for side chains in proteins.

Abstract:

:Structural knowledge about proteins is mainly derived from values of observables, measurable in NMR spectroscopic or X-ray diffraction experiments, i.e. absorbed or scattered intensities, through theoretically derived relationships between structural quantities such as atom positions or torsional angles on the one hand and observable quantities such as squared structure factor amplitudes, NOE intensities or (3) J-coupling constants on the other. The standardly used relation connecting (3) J-couplings to torsional angles is the Karplus relation, which is used in protein structure refinement as well as in the evaluation of simulated properties of proteins. The accuracy of the simple and generalised Karplus relations is investigated using side-chain structural and (3) J (αβ)-coupling data for three different proteins, Plastocyanin, Lysozyme, and FKBP, for which such data are available. The results show that the widely used Karplus relations are only a rough estimate for the relation between (3) J (αβ)-couplings and the corresponding χ(1)-angle in proteins.

journal_name

J Biomol NMR

authors

Steiner D,Allison JR,Eichenberger AP,van Gunsteren WF

doi

10.1007/s10858-012-9634-5

subject

Has Abstract

pub_date

2012-07-01 00:00:00

pages

223-46

issue

3

eissn

0925-2738

issn

1573-5001

journal_volume

53

pub_type

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