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(A) The DEBS AT5 domain, showing the overall fold with the active site Ser in purple, and the substrate-binding pocket under the Ser in the cleft formed by domains A and B. The four structural elements discussed in the text (items 1–4) that are important for specificity are highlighted in red, purple, green and blue, respectively. (B) Proposed catalytic mechanism of the AT domain. R = rest of acyl chain.
