We present a protocol to identify protein moieties containing antigens for human and mouse IgM antibodies with specific kappa (Vκ) light chains. This protocol is not limited to IgM class antibodies but applies to all immunoglobulin isotypes that target their antigen with sufficiently high affinity during immunoprecipitations.
Watzlawik, J. O., Kahoud, R. J., Wootla, B., Painter, M. M., Warrington, A. E., Carey, W. A., Rodriguez, M. Antibody Binding Specificity for Kappa (Vκ) Light Chain-containing Human (IgM) Antibodies: Polysialic Acid (PSA) Attached to NCAM as a Case Study. J. Vis. Exp. (112), e54139, doi:10.3791/54139 (2016).