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- W1589731672 abstract "Abstract Stathmin is a ubiquitous soluble protein (Mr approximately 19,000, pI approximately 6.2-5.5) whose phosphorylation is associated with the intracellular mechanisms involved in the regulations of cell differentiation and functions by extracellular effectors. Its purification from rat brain and the preparation of specific antibodies allowed us to identify a set of immunologically related unphosphorylated (N1, N2) and phosphorylated (P1, P2a, P2b, P3) proteins of decreasing isoelectric points. All these proteins yielded identical silver-stained or 32P-radioactive peptide maps with the protease V8 from Staphylococcus aureus, indicating that they are also structurally related. In vitro phosphorylation with the exogenous catalytic subunit of the cAMP-dependent protein kinase, as well as dephosphorylation with alkaline phosphatase, indicated that P1, P2, and P3 derived from N1 and N2 by progressive phosphorylation. Phosphorylation of individual proteins extracted from semi-preparative two-dimensional polyacrylamide gels demonstrated the existence of two distinct isoforms of stathmin, alpha and beta: N1 and N2 are their respective unphosphorylated forms (alpha O and beta O), whereas proteins P1-P3 could be resolved as at least three increasingly phosphorylated forms of both alpha and beta stathmin (alpha 1, alpha 2, alpha(3) and beta 1, beta 2, beta(3]. In intact pituitary GH4C1 cells, hormones like thyrotropin-releasing hormone and vasoactive intestinal peptide induced a similar conversion from N1 and N2 to P1, P2, and P3. The phosphorylation of both alpha and beta isoforms of stathmin is therefore a physiologically significant response to specific extracellular regulatory agents. In conclusion, stathmin represents a family of at least two distinct protein isoforms, whose respective phosphorylation and expression might play a role in its likely function as an intracellular relay of various converging extracellular signals." @default.
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- W1589731672 date "1989-06-01" @default.
- W1589731672 modified "2023-09-29" @default.
- W1589731672 title "Identification of two distinct isoforms of stathmin and characterization of their respective phosphorylated forms" @default.
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- W1589731672 doi "https://doi.org/10.1016/s0021-9258(18)81749-5" @default.
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