Figure 2.

Cartoon representation of (a) the αβ subunit of CGB lectin and (b) CMB lectin. The protein structures are coloured to highlight the three sheets making up the prisms [marine for sheet (i), green/cyan for sheet (ii) and warm pink for sheet (iii)]. The cleaved β-chain is highlighted in purple in sheet (iii) for CGB, whereas in CMB this β-strand is part of the single oligopetptide chain. An asterisk (*) highlights the sugar-binding sites of the two proteins. (c) Shows a topology representation of the β-prism that is formed by both proteins. Mature CGB has been post-translationally processed, leaving β1 as a separate chain. The processed loop is coloured in grey. The numbering assumes the β-chain to be the first strand of the protein, to make comparison between the two lectins easier.