Figure 4. Sequence alignment of chicken (CHK); mouse (MUS) and human (HUM) CKB.
Six canonical hotspots for isoAsp formation are indicated with carets (∧). Color-coding indicates regions of β-sheet (blue), α-helix (magenta), and turns (yellow) as deduced from crystal structure data according to the ExPASY (www.expasy.org) alignment application. Mouse is not color-coded because there is no crystal structure for mouse CKB. The dashed box encloses the acidic EED triplet essential for enzymatic activity.