A new, simplified method for oxidation of human complement component C2.

Abstract Oxy C2 is a valuable immunologic reagent, particularly for investigators whose research or clinical assays require a stable classical pathway C3 and/or C5 convertase or a highly active plasma complement source. To date only one method for the conversion of serum C2 or purified C2 to their respective oxy C2 forms has been published. However, this method has several disadvantages. For example, handling and dissolving the iodine crystals required in this process are difficult and time consuming. Also, the enhancement procedure results in a significant dilution of the original C2 sample. We have, therefore, developed a new, simplified method for oxidation of plasma, serum, or pure C2 which circumvents the difficulties associated with the earlier method. Moreover, this method offers additional flexibility with regard to oxidative conditions (i.e., buffer pH, temperature, and C2 concentrations) and reagent handling and final C2 product stability.