This protein family includes Pimeloyl-ACP methyl esterase BioG from Haemophilus influenzae (Swiss:P44251) and similar bacterial proteins. This enzyme is involved in the biosynthesis of pymeloyl-ACP and, hence, in biotin biosynthesis. It is organised into a a core domain formed by a seven-stranded beta-sheet and a lid domain consisting of four alpha-helices [1].

1: An Atypical alpha/beta-Hydrolase Fold Revealed in the Crystal Structure of Pimeloyl-Acyl Carrier Protein Methyl Esterase BioG from Haemophilus influenzae. Shi J, Cao X, Chen Y, Cronan JE, Guo Z; Biochemistry. 2016;55:6705-6717. PMID:27933801