title: Characterization of reversible associations by sedimentation velocity with UltraScan.
abstract: We compare here the utility of sedimentation velocity (SV) to sedimentation equilibrium (SE) analysis for the characterization of reversible systems. Genetic algorithm optimization in UltraScan is used to optimize the model and to obtain solution properties of all components present in the system. We apply our method to synthetic and experimental data, and suggest limits for the accessible kinetic range. We conclude that equilibrium constants obtained from SV and SE analysis are equivalent, but that SV experiments provide better confidence for the K(d), can better account for the presence of contaminants and provide additional information including rate constants and shape parameters.
authors.affiliation: Department of Biochemistry, The University of Texas Health Science Center at San Antonio, San Antonio, Texas 78229, USA. demeler@biochem.uthscsa.edu
authors.forename: Borries
authors.initials: B
authors.lastname: Demeler
authors.forename: Emre
authors.initials: E
authors.lastname: Brookes
authors.forename: Renjing
authors.initials: R
authors.lastname: Wang
authors.forename: Virgil
authors.initials: V
authors.lastname: Schirf
authors.forename: Chongwoo A
authors.initials: CA
authors.lastname: Kim
mesh_terms: D000465:Algorithms; D005591:Chemical Fractionation; D003198:Computer Simulation; D004268:DNA-Binding Proteins / Q000378:metabolism; D006801:Humans; D007700:Kinetics; D008970:Molecular Weight; D063150:Polycomb Repressive Complex 1; D055503:Protein Multimerization; D044767:Ubiquitin-Protein Ligases / Q000378:metabolism; D014461:Ultracentrifugation / Q000379:methods*
chemical_list: D004268:DNA-Binding Proteins; D063150:Polycomb Repressive Complex 1; C489841:RNF2 protein, human; D044767:Ubiquitin-Protein Ligases