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• W1607754793 abstract "Proteolytic cleavage of protein kinase C (PKC) under cell‐free conditions generates a co‐factor independent, free catalytic subunit (PKM). However, the difficulty in visualizing PKM in intact cells has generated controversy regarding its physiological relevance. In the present study, treatment of SH‐SY‐5Y cells with 2‐O‐tetradecanoylphorbol 13‐acetate resulted in complete down‐regulation of PKC within 24 h without detection of PKM. By contrast, low levels of PKM were transiently detected following ionophore‐mediated calcium influx under conditions which induced no detectable PKC loss. PKM was not detected during rapid cell‐free degradation of partially purified SH‐SY‐5Y PKCα by purified human brain mM calpain. However, when the kinetics of PKC degradation were slowed by lowering levels of calpain, PKM was transiently detected. PKM was also only transiently observed following calpain‐mediated degradation of purified rat brain PKCα. Densitometric analyses indicated that, once formed, PKM was degraded approximately 10 times faster than PKC. These data provide an explanation as to why PKM is difficult to observe in situ, and indicate that PKM should not be considered as an ‘unregulated’ kinase, since its persistence is apparently strictly regulated by proteolysis." @default.
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• W1607754793 date "1994-08-22" @default.
• W1607754793 modified "2023-10-18" @default.
• W1607754793 title "Degradation of protein kinase Cα and its free catalytic subunit, protein kinase M, in intact human neuroblastoma cells and under cell‐free conditions" @default.
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• W1607754793 doi "https://doi.org/10.1016/0014-5793(94)00769-1" @default.
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