Structure-independent analysis of the breadth of the positional distribution of disordered groups in macromolecules from order parameters for long, variable-length vectors using NMR paramagnetic relaxation enhancement.

ABSTRACT: Quantitative information regarding structurally disordered groups is crucial for a complete understanding of the relationship between structure, dynamics, and function in biological macromolecules. Experimental analysis, however, of the positional distribution of disordered groups in the macromolecular frame is extremely difficult. While NMR order parameters, S(2), for fixed-length bond vectors such as N-H and C-H are commonly used for investigations of conformational dynamics of macromolecules, these order parameters provide only angular information about internal motions and are totally insensitive to translational motions. Although analysis of S(2) for bond vectors permits identification of disordered groups in macromolecules, this type of order parameter cannot provide any information

SUBMITTER: Iwahara J 

PROVIDER: S-EPMC2944921 | biostudies-literature | 2010 Sep

REPOSITORIES: biostudies-literature