Functional convergence of structurally distinct thioesterases from cyanobacteria and plants involved in phylloquinone biosynthesis

The crystal structures of two 1,4-dihydroxy-2-naphthoyl-CoA thioesterases of plant and cyanobacterial origin that are involved in the biosynthesis of phylloquinone are presented. The divergent structures of these two functionally similar enzymes indicate convergent evolution.