[No authors listed]
Antipeptide antibodies generated against the N terminus of the protein phosphatase 1 (PP1) binding protein sds22 detected at least four forms of the protein in a rat liver nuclear extract. Four of these immunoreactive bands likely correspond to four predicted forms of sds22 that are generated by alternative splicing. These four proteins are expressed at different levels and appear to be localized exclusively in the nucleus, and two of these proteins copurify with PPI on the protein phosphatase affinity matrix microcystin-Sepharose. Two higher molecular mass nuclear proteins that are immunoreactive with the sds22 antibodies also copurify on microcystin-Sepharose and may be novel forms of sds22 expressed in mammalian cells.
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