This entry represents the N-terminal HotDog domain of the dehydratase (DH) module of polyketide synthases [1]. Structural analysis shows these DH domains are double hotdogs in which the active site contains a histidine from the N-terminal hotdog and an aspartate from the C-terminal hotdog. Studies have uncovered that a substrate tunnel formed between the DH domains may be essential for loading substrates and unloading products [2].

1: Crystal structure of the erythromycin polyketide synthase dehydratase. Keatinge-Clay A; J Mol Biol. 2008;384:941-953. PMID:18952099

2: Crystal structures of dehydratase domains from the curacin polyketide biosynthetic pathway. Akey DL, Razelun JR, Tehranisa J, Sherman DH, Gerwick WH, Smith JL; Structure. 2010;18:94-105. PMID:20152156