Coimmunoprecipitation assay with ENO4, AKAP4, ENO, and PGAM2. A) Regions of ENO4_V1 (aa 1–571), truncated N-terminal ENO4-N (aa 1–228), and ENO4-C (aa 228–618) used for in vitro synthesized [35S]-labeled probes. B) [35S]-ENO4_V1 and [35S]-ENO4-C were coimmunoprecipitated from sperm lysates with AKAP4 by the antiserum to AKAP4 but not by rabbit IgG. C) [35S]-ENO4-C was coimmunoprecipitated from sperm lysates with ENO1 or GM5506 by the antibody to pan-enolase but not by rabbit IgG. D) [35S]-PGAM2 was coimmunoprecipitated from sperm lysates with ENO1 or GM5506 by the antibody to pan-enolase but not by rabbit IgG.