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Publications

DOI

J. Am. Chem. Soc. 2023

Identifying and Overcoming Artifacts in 1 H-Based Saturation Transfer NOE NMR Experiments

J. T. Grün, J. Kim, S. Jayanthi, A. Lupulescu, E̅. Kupče, H. Schwalbe, and L. Frydman*

Magnetization transfer experiments are versatile nuclear magnetic resonance (NMR) tools providing site-specific information. We have recently discussed how saturation magnetization transfer (SMT) experiments could leverage repeated repolarizations arising from exchanges between labile and water protons to enhance connectivities revealed via the nuclear Overhauser effect (NOE). Repeated experience with SMT has shown that a number of artifacts may arise in these experiments, which may confound the information being sought – particularly when seeking small NOEs among closely spaced resonances. One of these pertains to what we refer to as “spill-over” effects, originating from the use of long saturation pulses leading to changes in the signals of proximate peaks. A second, related but in fact different effect, derives from what we describe as NOE “oversaturation”, a phenomenon whereby the use of overtly intense RF fields overwhelms the cross-relaxation signature. The origin and ways to avoid these two effects are described. A final source of potential artifact arises in applications where the labile 1Hs of interest are bound to 15N-labeled heteronuclei. SMT’s long 1H saturation times will then be usually implemented while under 15N decoupling based on cyclic schemes leading to decoupling sidebands. Although these sidebands usually remain invisible in NMR, they may lead to a very efficient saturation of the main resonance when touched by SMT frequencies. All of these phenomena are herein experimentally demonstrated, and solutions to overcome them are proposed.

Funded by


Goethe Corona Fonds

DFG

Volkswagen Stiftung

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Coordination

Prof. Dr. Harald Schwalbe (Coordinator)
Institut für Organische Chemie und Chemische Biologie
Zentrum für Biomolekulare Magnetische Resonanz

Johann Wolfgang Goethe-Universität
N160-3.13
Max-von-Laue-Strasse 7
D-60438 Frankfurt am Main

Contact us

++49 69 798 29737
schwalbe@nmr.uni-frankfurt.de

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