title: Real time kinetic analysis of the interaction between immunoglobulin G and histidine using quartz crystal microbalance biosensor in solution.
abstract: Quartz crystal microbalance (QCM) biosensor integrated in a flow injection analysis (FIA) system was used for the investigation of the specific interaction between immunoglobin G (IgG) and histidine. The histidine was immobilized on the gold electrodes of the piezoelectric crystal using appropriate procedures based on self-assembling of the dithiothreitol (DTT). The specific interaction of the immobilized ligand with IgG in solution was followed as a change in the resonant frequency of the modified crystal and studied in real time without any additional labels. With the mass sensitive biosensor system, the differences in affinity of three different species of IgG: human IgG, goat IgG and mouse IgG were easily distinguished and their respective kinetic rate constants (kass and kdiss) and equilibrium association constants (KA) were determined from the curves of frequency versus time. For the interactions, KA were 2.92 x 10(4), 3.23 x 10(4) and 4.08 x 10(4) M(-1) for human IgG, goat IgG and mouse IgG, respectively.
authors.affiliation: Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.forename: Xiao
authors.initials: X
authors.lastname: Yu
authors.forename: Rui
authors.initials: R
authors.lastname: Zhao
authors.forename: Di-Hua
authors.initials: DH
authors.lastname: Shangguan
authors.forename: Zuyi
authors.initials: Z
authors.lastname: Bo
authors.forename: Guoquan
authors.initials: G
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D000936:Antigen-Antibody Complex / Q000032:analysis / Q000737:chemistry*; D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D019544:Equipment Failure Analysis; D017022:Flow Injection Analysis / Q000295:instrumentation* / Q000379:methods; D006639:Histidine / Q000032:analysis / Q000737:chemistry*; D007118:Immunoassay / Q000295:instrumentation* / Q000379:methods; D007074:Immunoglobulin G / Q000032:analysis / Q000737:chemistry*; D007700:Kinetics; D008956:Models, Chemical; D011485:Protein Binding; D011791:Quartz; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012996:Solutions
chemical_list: D000936:Antigen-Antibody Complex; D007074:Immunoglobulin G; D012996:Solutions; D011791:Quartz; D006639:Histidine