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Default PARAssign-paramagnetic NMR assignments of protein nuclei on the basis of pseudocontact shifts.

PARAssign-paramagnetic NMR assignments of protein nuclei on the basis of pseudocontact shifts.

Related Articles PARAssign-paramagnetic NMR assignments of protein nuclei on the basis of pseudocontact shifts.

J Biomol NMR. 2013 Mar 23;

Authors: Skinner SP, Moshev M, Hass MA, Ubbink M

Abstract
The use of paramagnetic NMR data for the refinement of structures of proteins and protein complexes is widespread. However, the power of paramagnetism for protein assignment has not yet been fully exploited. PARAssign is software that uses pseudocontact shift data derived from several paramagnetic centers attached to the protein to obtain amide and methyl assignments. The ability of PARAssign to perform assignment when the positions of the paramagnetic centers are known and unknown is demonstrated. PARAssign has been tested using synthetic data for methyl assignment of a 47*kDa protein, and using both synthetic and experimental data for amide assignment of a 14*kDa protein. The complex fitting space involved in such an assignment procedure necessitates that good starting conditions are found, both regarding placement and strength of paramagnetic centers. These starting conditions are obtained through automated tensor placement and user-defined tensor parameters. The results presented herein demonstrate that PARAssign is able to successfully perform resonance assignment in large systems with a high degree of reliability. This software provides a method for obtaining the assignments of large systems, which may previously have been unassignable, by using 2D NMR spectral data and a known protein structure.


PMID: 23526169 [PubMed - as supplied by publisher]



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