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Polychromatic Selective Population Inversion for TROSY Experiments with Large Proteins

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journal contribution
posted on 12.01.2005, 00:00 by Krystyna Bromek, Donghan Lee, Richard Hauhart, Malgorzata Krych-Goldberg, John P. Atkinson, Paul N. Barlow, Konstantin Pervushin
This paper presents polychromatic selective polarization inversion (PC−SPI) as an alternative to the polarization transfer methods recently developed for the application of NMR to large biological molecules. Theoretical and numerical considerations indicate that PC−SPI has the potential for more efficient polarization transfer under conditions of rapid transverse relaxation compared to J coupling- and cross-correlated relaxation-based transfers. The main advantage offered by the method presented here is the maintenance of near-optimal trajectories of inversion of the individual components of the spin magnetization while using broadband optimized pulses. A 2D experiment was implemented combining PC−SPI with TROSY-based chemical shift correlation. The experiment was applied to detect 15N−1H chemical shift correlation spectra of a 200 kDa complex consisting of an 80% 2H- and uniformly 15N,13C-labeled 22 kDa portion of complement receptor type 1 and unlabeled C3b of complement (180 kDa).

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