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The Quality of the Embedding Potential Is Decisive for Minimal Quantum Region Size in Embedding Calculations: The Case of the Green Fluorescent Protein

Journal Article · · Journal of Chemical Theory and Computation

The calculation of spectral properties for photoactive proteins is challenging because of the large cost of electronic structure calculations on large systems. Mixed quantum mechanical (QM) and molecular mechanical (MM) methods are typically employed to make such calculations computationally tractable. This study addresses the connection between the minimal QM region size and the method used to model the MM region in the calculation of absorption properties—here exemplified for calculations on the green fluorescent protein. We find that polarizable embedding is necessary for a qualitatively correct description of the MM region, and that this enables the use of much smaller QM regions compared to fixed charge electrostatic embedding. Furthermore, absorption intensities converge very slowly with system size and inclusion of effective external field effects in the MM region through polarizabilities is therefore very important. Furthermore, this embedding scheme enables accurate prediction of intensities for systems that are too large to be treated fully quantum mechanically.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1471082
Alternate ID(s):
OSTI ID: 1463398
Journal Information:
Journal of Chemical Theory and Computation, Journal Name: Journal of Chemical Theory and Computation Journal Issue: 12 Vol. 13; ISSN 1549-9618
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Assessing Configurational Sampling in the Quantum Mechanics/Molecular Mechanics Calculation of Temoporfin Absorption Spectrum and Triplet Density of States journal November 2018
Response properties of embedded molecules through the polarizable embedding model journal September 2018
Modeling absorption spectra of molecules in solution journal September 2018
Combining polarizable embedding with the Frenkel exciton model: applications to absorption spectra with overlapping solute–solvent bands journal March 2019
Large-scale QM/MM free energy simulations of enzyme catalysis reveal the influence of charge transfer journal January 2018
Revealing quantum mechanical effects in enzyme catalysis with large-scale electronic structure simulation journal January 2019
The key to the yellow-to-cyan tuning in the green fluorescent protein family is polarisation journal January 2019
Combining Polarizable Embedding with the Frenkel Exciton Model: Applications to Absorption Spectra with Overlapping Solute-Solvent Bands posted_content January 2019
Combining Polarizable Embedding with the Frenkel Exciton Model: Applications to Absorption Spectra with Overlapping Solute-Solvent Bands preprint January 2019
Do Better Quality Embedding Potentials Accelerate the Convergence of QM/MM Models? The Case of Solvated Acid Clusters journal September 2018

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