The catalytic domain (CD, cyan), the basic allosteric pocket (yellow) and the critical auto-phosphorylation site T348 (green) on the regulatory loop (R-loop) are shown; the C-terminal domain (CTD, red) contains multiple Sel1 like repeats (Mittl and Schneider-Brachert, 2007). The N-terminal CaM-binding domain (CBD, 74-100, blue) is encoded by the eEF-2KCBD peptide used here.