Publication details

Cross-correlated relaxation measurements under adiabatic sweeps: determination of local order in proteins

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Year of publication 2015
Type Article in Periodical
Magazine / Source Journal of Biomolecular NMR
MU Faculty or unit

Central European Institute of Technology

Web Full Text
Field Biochemistry
Keywords NMR; Protein dynamics; Adiabatic sweep; Cross-correlated cross relaxation
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Description Adiabatically swept pulses were originally designed for the purpose of broadband spin inversion. Later, unexpected advantages of their utilization were also found in other applications, such as refocusing to excite spin echoes, studies of chemical exchange or fragment-based drug design. Here, we present new experiments to characterize fast (ps-ns) protein dynamics, which benefit from little-known properties of adiabatic pulses. We developed a strategy for measuring cross-correlated cross-relaxation (CCCR) rates during adiabatic pulses. This experiment provides a linear combination of longitudinal and transverse CCCR rates, which is offset-independent across a typical amide spectrum. The pulse sequence can be recast to provide accurate transverse CCCR rates weighted by the populations of exchanging states. Sensitivity can be improved in systems in slow exchange. Finally, the experiments can be easily modified to yield residue-specific correlation times. The average correlation time of motions can be determined with a single experiment while at least two different experiments had to be recorded until now.
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