The AfsA family are key enzymes in A-factor biosynthesis, which is essential for streptomycin production and resistance. This domain is distantly related to the thioester dehydratase FabZ family and therefore has a HotDog domain [2].

1: New Knowledge from Old: In silico discovery of novel protein domains in Streptomyces coelicolor. Yeats C, Bentley S, Bateman A; BMC Microbiol 2003;3:3-3. PMID:12625841

2: The Hotdog fold: wrapping up a superfamily of thioesterases and dehydratases. Dillon SC, Bateman A; BMC Bioinformatics 2004;5:109-109. PMID:15307895