Figure 4.
(A) Interaction between surface-adsorbed Cp and free MPO was inhibited by pre-incubating MPO with anti-P18 antisera, excess free Cp, or ascorbate oxidase (AO) (mean ± SEM, n = 4 well per reaction, p<0.05). (B) MPO activity measured by incubating MPO with peroxidase substrate. Various concentrations Cp with or without anti-P18 antisera, and AO were preincubated with MPO to inhibit its peroxidase activity (mean ± SEM, n = 4 well per reaction, p<0.05). (C) Crystal structure of Cp with highlighted P18 and P76 sequences visualized by PyMOL. (D) A model for Cp-MPO interaction that results in MPO inhibition.