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Triple Resonance Three-Dimensional Protein NMR: Before it Became a Black Box

Published: Monday, April 29, 2013
Last Updated: Monday, April 29, 2013
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This account provides a personal perspective on three-dimensional triple resonance experiments, providing some historical background.

Three-dimensional triple resonance experiments have become an integral part of virtually every solution NMR study of proteins. The approach relies on uniform isotopic enrichment of proteins with (13)C and (15)N, and establishes the scalar connectivity pathway between nuclei through the large (1)J(NH), (1)J(CH)(, 1)J(CC), and (1)J(CN) couplings. The magnetization transfer process takes place through multiple, efficient one-bond magnetization transfer steps, rather than a single step through the smaller and variable (3)J(HH) couplings. The relatively large size and good uniformity of the one-bond couplings allowed the design of efficient magnetization transfer schemes that are effectively uniform across a given protein, nearly independent of conformation. Although conceptually straightforward, practical implementation of three-dimensional triple resonance experiments on proteins originally posed serious challenges. This account provides a personal perspective on some of the historical background to this work, the problems encountered as well as their solutions, and their evolution into today's standard arsenal of experiments.

The full account is published online in the Journal of Magnetic Resonance and is free to access.

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