Figure 1.

Schematic representation of R28, Alp family members, and R28-N1 predicted 3D structure. A, schematic representation of the Alp family members structure and similarity. Numbers in black below the scheme indicate the length in amino acid residues, and numbers in red indicate the percentages of identify between two domains. S, signal peptide; R, repeats; L, LPXTG. *, KTD in ACP, KAD in R28, and KPD in Rib. Modified with our sequence comparisons from Refs. 1–3. B, R28-N1 structure as predicted by Phyre. Green and yellow, the β-sandwich; yellow to red, the three-helix bundle.