Purified antibodies from an antiserum against S-phase proteins of the myxomycete Physarum polycephalum were attached to protein-A-Sepharose CL-4B. A late G2-phase extract that contained a mitosis-stimulating protein was applied to this immunoadsorbent, and the mitosis-stimulating protein was enriched by a factor of ten. This protein, which is present in the cell in low amounts, is synthesized in late G2 phase and obviously degraded in a later stage of the cycle. Immunoadsorption of a G2-phase extract with anti-S-antibodies decreased the 700 main proteins to 20 as demonstrated by two-dimensional gel electrophoresis. No difference in protein pattern could be observed on two-dimensional gels between S-phase and G2-phase extracts before and after immunoadsorption with anti-S-antibodies. This indicates that there are no G2-phase-specific proteins among the 700 most abundant proteins of Physarum polycephalum.
An immunological approach to enrich a mitotic stimulator and to reveal G2-phase-specific proteins in Physarum polycephalum.
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P Gröbner, P Loidl; An immunological approach to enrich a mitotic stimulator and to reveal G2-phase-specific proteins in Physarum polycephalum.. J Cell Biol 1 June 1985; 100 (6): 1930–1933. doi: https://doi.org/10.1083/jcb.100.6.1930
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