Figure 1
(a) The triangular spiral staircase arrangement of helices indicative of the armadillo repeat. (b) Ribbon diagram of His-YIIIM5AII. The His6 tag, YIII-type, M-type and AII-type repeats are shown in magenta, green, blue and orange, respectively. (c) Sequence alignment of N-caps with and without a 3C protease cleavage site (the scissile bond is indicated by a grey arrow), internal repeats and C-caps. Residues distinguishing different repeat versions are highlighted in red. |