This family consists of various acyl-acyl carrier protein (ACP) thioesterases (TE) which terminate fatty acyl group extension via hydrolyzing an acyl group on a fatty acid [1].
Mayer KM, Shanklin J.
A structural model of the plant acyl-acyl carrier protein thioesterase FatB comprises two helix/4-stranded sheet domains, the N-terminal domain containing residues that affect specificity and the C-terminal domain containing catalytic residues.
J. Biol. Chem. 280 2005 3621-7
[PubMed: 15531590] http://dx.doi.org/10.1074/jbc.M411351200