title: Mapping enzymatic catalysis using the effective fragment molecular orbital method: towards all ab initio biochemistry.
abstract: We extend the Effective Fragment Molecular Orbital (EFMO) method to the frozen domain approach where only the geometry of an active part is optimized, while the many-body polarization effects are considered for the whole system. The new approach efficiently mapped out the entire reaction path of chorismate mutase in less than four days using 80 cores on 20 nodes, where the whole system containing 2398 atoms is treated in the ab initio fashion without using any force fields. The reaction path is constructed automatically with the only assumption of defining the reaction coordinate a priori. We determine the reaction barrier of chorismate mutase to be [Formula: see text] kcal mol(-1) for MP2/cc-pVDZ and [Formula: see text] for MP2/cc-pVTZ in an ONIOM approach using EFMO-RHF/6-31G(d) for the high and low layers, respectively.
authors.affiliation: Department of Chemistry, University of Copenhagen, Copenhagen, Denmark.
authors.forename: Casper
authors.initials: C
authors.lastname: Steinmann
authors.forename: Dmitri G
authors.initials: DG
authors.lastname: Fedorov
authors.forename: Jan H
authors.initials: JH
authors.lastname: Jensen
mesh_terms: D055162:Biocatalysis; D001671:Biochemistry / Q000379:methods*; D002826:Chorismate Mutase / Q000737:chemistry / Q000378:metabolism*; D002827:Chorismic Acid / Q000378:metabolism; D003509:Cyclohexanecarboxylic Acids / Q000378:metabolism; D053138:Cyclohexenes / Q000378:metabolism; D008958:Models, Molecular; D013816:Thermodynamics; D013997:Time Factors
chemical_list: D003509:Cyclohexanecarboxylic Acids; D053138:Cyclohexenes; D002826:Chorismate Mutase; D002827:Chorismic Acid; C005550:prephenic acid