alexa Phosphorylation of plant actin-depolymerising factor by calmodulin-like domain protein kinase.
Microbiology

Microbiology

Journal of Antivirals & Antiretrovirals

Author(s): Allwood EG, Smertenko AP, Hussey PJ

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Abstract The actin-depolymerising factor (ADF)/cofilin group of proteins are stimulus-responsive actin-severing proteins, members of which are regulated by reversible phosphorylation. The phosphorylation site on the maize ADF, ZmADF3, is Ser-6 but the kinase responsible is unknown [Smertenko et al., Plant J. 14 (1998) 187-193]. We have partially purified the ADF kinase(s) and found it to be calcium-regulated and inhibited by N-(6-aminohexyl)-[(3)H]5-chloro-1-naphthalenesulphonamide. Immunoblotting reveals that calmodulin-like domain protein kinase(s) (CDPK) are enriched in the purified preparation and addition of anti-CDPK to in vitro phosphorylation assays results in the inhibition of ADF phosphorylation. These data strongly suggest that plant ADF is phosphorylated by CDPK(s), a class of protein kinases unique to plants and protozoa.
This article was published in FEBS Lett and referenced in Journal of Antivirals & Antiretrovirals

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