Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 27, Pages 14960-14966Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202101149
Keywords
Ab initio magnetic susceptibility; magneto-structural correlations; metal coordination; NMR Spectroscopy
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Funding
- Fondazione Cassa di Risparmio di Firenze
- Italian Ministero dellIstruzione, dellUniversita e della Ricerca through the Progetto Dipartimenti di Eccellenza 2018-2022
- EMBO Short-Term Fellowship [STF8629]
- CINECA
- ESFRI project
- CERM/CIRMMP Italy center
- University of Florence through the Progetti Competitivi per Ricercatori
- Instruct-ERIC
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The study demonstrates that it is possible to determine the coordination environment of paramagnetic metals in proteins with a resolution inaccessible to other techniques by fitting pseudocontact shifts obtained from first principles quantum chemical calculations to experimental data. This approach provides a new way for structural characterization of metalloproteins that cannot be achieved by other methods.
Metalloproteins constitute a significant fraction of the proteome of all organisms and their characterization is critical for both basic sciences and biomedical applications. A large portion of metalloproteins bind paramagnetic metal ions, and paramagnetic NMR spectroscopy has been widely used in their structural characterization. However, the signals of nuclei in the immediate vicinity of the metal center are often broadened beyond detection. In this work, we show that it is possible to determine the coordination environment of the paramagnetic metal in the protein at a resolution inaccessible to other techniques. Taking the structure of a diamagnetic analogue as a starting point, a geometry optimization is carried out by fitting the pseudocontact shifts obtained from first principles quantum chemical calculations to the experimental ones.
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