Fig. 4.

Analysis of the surface conservation among the PCS family. (A and B) Mapping of the sequence conservation in the native (A) and acyl–enzyme (B) structures. In each case the surface is colored according to the alignment found in Fig. 3. Red patches correspond to identical and homologous sequence conservation (red and gray shading in the alignment). Residues conserved in all PCSs but Nostoc are colored in yellow, except for cysteine residues falling in this category, which are colored in blue.