QM/MM calculation of protein magnetic shielding tensors with generalized hybrid-orbital method: A GIAO approach
Literature Information
Yoshinobu Akinaga, Jaewoon Jung, Seiichiro Ten-no
A method to compute magnetic shielding tensors with generalized hybrid-orbital (GHO) QM/MM scheme is developed at the levels of Hartree–Fock and second-order Møller–Plesset perturbation theory using gauge-including atomic orbitals. A feature of the GHO method is utilized to ensure gauge-origin independency of GHO shielding tensors in a simple way. The benchmark calculations indicate that the GHO method reproduced full-QM shielding constants nearly quantitatively for atoms not directly coupled to the GHO linking atoms. As an application to a realistic protein, carbon chemical shifts are calculated for the retinal chromophore in visual rhodopsin.
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