title: Enzyme efficiency: An open reaction system perspective.
abstract: A measure of enzyme efficiency is proposed for an open reaction network that, in suitable form, applies to closed systems as well. The idea originates from the description of classical enzyme kinetics in terms of cycles. We derive analytical expressions for the efficiency measure by treating the network not only deterministically but also stochastically. The latter accounts for any significant amount of noise that can be present in biological systems and hence reveals its impact on efficiency. Numerical verification of the results is also performed. It is found that the deterministic equation overestimates the efficiency, the more so for very small system sizes. Roles of various kinetics parameters and system sizes on the efficiency are thoroughly explored and compared with the standard definition k2/KM. Study of substrate fluctuation also indicates an interesting efficiency-accuracy balance.
authors.affiliation: Department of Chemistry, University of Calcutta, Rajabazar Science College Campus, Kolkata 700 009, India.
authors.forename: Kinshuk
authors.initials: K
authors.lastname: Banerjee
authors.affiliation: Department of Chemistry, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India.
authors.forename: Kamal
authors.initials: K
authors.lastname: Bhattacharyya
mesh_terms: D004798:Enzymes / Q000737:chemistry / Q000378:metabolism*; D007700:Kinetics; D013269:Stochastic Processes
chemical_list: D004798:Enzymes