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Default Reliable resonance assignments of selected residues of proteins with known structure based on empirical NMR chemical shift prediction.

Reliable resonance assignments of selected residues of proteins with known structure based on empirical NMR chemical shift prediction.

Related Articles Reliable resonance assignments of selected residues of proteins with known structure based on empirical NMR chemical shift prediction.

J Magn Reson. 2015 Mar 7;254:93-97

Authors: Li DW, Meng D, Brüschweiler R

Abstract
A robust NMR resonance assignment method is introduced for proteins whose 3D structure has previously been determined by X-ray crystallography. The goal of the method is to obtain a subset of correct assignments from a parsimonious set of 3D NMR experiments of (15)N, (13)C labeled proteins. Chemical shifts of sequential residue pairs are predicted from static protein structures using PPM_One, which are then compared with the corresponding experimental shifts. Globally optimized weighted matching identifies the assignments that are robust with respect to small changes in NMR cross-peak positions. The method, termed PASSPORT, is demonstrated for 4 proteins with 100-250 amino acids using 3D NHCA and a 3D CBCA(CO)NH experiments as input producing correct assignments with high reliability for 22% of the residues. The method, which works best for Gly, Ala, Ser, and Thr residues, provides assignments that serve as anchor points for additional assignments by both manual and semi-automated methods or they can be directly used for further studies, e.g. on ligand binding, protein dynamics, or post-translational modification, such as phosphorylation.


PMID: 25863893 [PubMed - as supplied by publisher]



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