Three-dimensional structure of photosystem II from Thermosynechococcus elongates in complex with terbutryn

Abstract

Photosystem II is a key component of the photosynthetic pathway producing oxygen at the thylakoid membrane of cyanobacteria, green algae, and plants. The three-dimensional structure of photosystem II from the cyanobacterium Thermosynechococcus elongates in a complex with herbicide terbutryn (a photosynthesis inhibitor) was determined for the first time by X-ray diffraction and refined at 3.2 A resolution (Rfactor = 26.9%, Rfree = 29.9%, rmsd for bond lengths is 0.013 A, and rmsd for bond angles is 2.2°). The terbutryn molecule was located in the binding pocket of the mobile plastoquinone. The atomic coordinates of the refined structure of photosystem II in a complex with terbutryn were deposited in the Protein Data Bank.