Volume 131, Issue 10 pp. 3129-3133
Zuschrift

Hidden Conformations in Aspergillus niger Monoamine Oxidase are Key for Catalytic Efficiency

Christian Curado-Carballada

Christian Curado-Carballada

Institut de Química Computacional i Catàlisi (IQCC), Departament de Química, Carrer Maria Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain

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Dr. Ferran Feixas

Dr. Ferran Feixas

Institut de Química Computacional i Catàlisi (IQCC), Departament de Química, Carrer Maria Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain

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Dr. Javier Iglesias-Fernández

Dr. Javier Iglesias-Fernández

Institut de Química Computacional i Catàlisi (IQCC), Departament de Química, Carrer Maria Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain

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Prof. Sílvia Osuna

Corresponding Author

Prof. Sílvia Osuna

Institut de Química Computacional i Catàlisi (IQCC), Departament de Química, Carrer Maria Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain

ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain

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First published: 02 January 2019

Abstract

Enzymes exist as an ensemble of conformational states, whose populations can be shifted by substrate binding, allosteric interactions, but also by introducing mutations to their sequence. Tuning the populations of the enzyme conformational states through mutation enables evolution towards novel activity. Herein, Markov state models are used to unveil hidden conformational states of monoamine oxidase from Aspergillus niger (MAO-N). These hidden conformations, not previously observed by any other technique, play a crucial role in substrate binding and enzyme activity. This reveals how distal mutations regulate MAO-N activity by stabilizing these hidden, catalytically important conformational states, but also by modulating the communication pathway between both MAO-N subunits.

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