CPK4 cDNA ORF clone, Arabidopsis thaliana(thale cress)

Sequence and analysis of chromosome 4 of the plant Arabidopsis thaliana.
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Nature402(6763)769-77(1999 Dec)

This study discovered that a key Abscisic acid (ABA) signaling component calcium-dependent protein kinase 4 (CPK4) can interact with AtIpk2 beta under ABA treated conditions through affinity purification and mass spectrometry detection.
Title: Arabidopsis inositol polyphosphate kinase AtIpk2? is phosphorylated by CPK4 and positively modulates ABA signaling.

Two abscisic acid (ABA)-activated calcium-dependent protein kinases, CPK4 and CPK11, phosphorylate the C-terminus of ACS6 and increase the stability of ACS6 in ethylene biosynthesis.
Title: Abscisic acid inhibits root growth in Arabidopsis through ethylene biosynthesis.