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Co-crystal structure of PksA-PT domain and probe 72 (PDB 5KBZ). The pantetheine and hexyl binding pockets are highlighted. The highly ordered solvent network of the core cyclization chamber is shown, along with the catalytic diad composed of residues Asp1543 (not labeled) and His1345. The C4 and C9 isosteres that react in the aldol cyclization are labeled with green asterisks.
