Abstract
We present a 13C direct detection CACA-TOCSY experiment for samples with alternate 13C–12C labeling. It provides inter-residue correlations between 13Cα resonances of residue i and adjacent Cαs at positions i − 1 and i + 1. Furthermore, longer mixing times yield correlations to Cα nuclei separated by more than one residue. The experiment also provides Cα-to-sidechain correlations, some amino acid type identifications and estimates for ψ dihedral angles. The power of the experiment derives from the alternate 13C–12C labeling with [1,3-13C] glycerol or [2-13C] glycerol, which allows utilizing the small scalar 3JCC couplings that are masked by strong 1JCC couplings in uniformly 13C labeled samples.
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Acknowledgments
Dr. Tsyr-Yan (Dharma) Yu, Dr. Arthanari Haribabu, and Dr. Alexander Koglin are acknowledged for stimulating discussions. This work was supported by the NIH (grants AI37581, GM47467 and EB 002026).
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Takeuchi, K., Frueh, D.P., Sun, ZY.J. et al. CACA-TOCSY with alternate 13C–12C labeling: a 13Cα direct detection experiment for mainchain resonance assignment, dihedral angle information, and amino acid type identification. J Biomol NMR 47, 55–63 (2010). https://doi.org/10.1007/s10858-010-9410-3
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DOI: https://doi.org/10.1007/s10858-010-9410-3