Title

Fast structure-based assignment of 15N HSQC spectra of selectively 15N-labeled paramagnetic proteins

RIS ID

16958

Publication Details

Pintacuda, G., Keniry, M., Huber, T., Park, A., Dixon, N. E. & Otting, G. (2004). Fast structure-based assignment of 15N HSQC spectra of selectively 15N-labeled paramagnetic proteins. Journal of the American Chemical Society, 126 (9), 2963-2970.

Abstract

A novel strategy for fast NMR resonance assignment of 15N HSQC spectra of proteins is presented. It requires the structure coordinates of the protein, a paramagnetic center, and one or more residue-selectively 15N-labeled samples. Comparison of sensitive undecoupled 15N HSQC spectra recorded of paramagnetic and diamagnetic samples yields data for every cross-peak on pseudocontact shift, paramagnetic relaxation enhancement, cross-correlation between Curie-spin and dipole−dipole relaxation, and residual dipolar coupling. Comparison of these four different paramagnetic quantities with predictions from the three-dimensional structure simultaneously yields the resonance assignment and the anisotropy of the susceptibility tensor of the paramagnetic center. The method is demonstrated with the 30 kDa complex between the N-terminal domain of the ε subunit and the θ subunit of Escherichia coli DNA polymerase III. The program PLATYPUS was developed to perform the assignment, provide a measure of reliability of the assignment, and determine the susceptibility tensor anisotropy.

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Link to publisher version (DOI)

http://dx.doi.org/10.1021/ja039339m