MD Simulations and QM/MM Calculations Reveal the Key Mechanistic Elements which are Responsible for the Efficient C-H Amination Reaction Performed by a Bioengineered P450 Enzyme

Abstract

An enzyme which is capable of catalyzing C-H amination reactions, is considered to be a dream tool for chemists due to its pharmaceutical potential and greener approach. Recently, the Arnold group achieved this feat using an engineered CYP411 enzyme, which further undergoes a random directed evolution which increases its efficiency and selectivity. The present study provides mechanistic insight and the root cause of the success of these mutations to enhance the reactivity and selectivity of the mutant enzyme. This is achieved by means of comprehensive MD simulations and hybrid QM/MM calculations. The study shows that the efficient C-H amination by the so-engineered CYP411 is a combined outcome of electronic and steric effects. The mutation of axial cysteine ligand to serine relays electron density to the Fe ion in the heme, and thereby enhances the bonding capability of the heme-iron to the nitrogen atom of the tosyl azide. By comparison, the native cysteine-ligated P450, cannot bind the tosyl azide. Additionally, the A78V and A82L mutations in P411 provide ‘bulk’ to the active site which thereby increases the enantioselectivity via steric effect. At the same time, the QM/MM calculations elucidate the C-H amination by the iron nitrenoid, revealing a mechanism analogous to Compound I in the native- C-H hydroxylation by P450.

Supplementary files

Article information

Article type
Edge Article
Submitted
27 Jun 2021
Accepted
08 Oct 2021
First published
13 Oct 2021
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2021, Accepted Manuscript

MD Simulations and QM/MM Calculations Reveal the Key Mechanistic Elements which are Responsible for the Efficient C-H Amination Reaction Performed by a Bioengineered P450 Enzyme

S. Kalita, S. Shaik and K. D. Dubey, Chem. Sci., 2021, Accepted Manuscript , DOI: 10.1039/D1SC03489H

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