5.3.3.17 dimer 2 * 32218, histidine-tagged enzyme -, 702206 5.3.3.17 dimer deduced from crystal structure. The crystal structure clarifies that the enzyme is a dimer in an up/up configuration with the two active sites facing each other. The dimer in the open form, generates by crystal symmetry (sulfate complex), interacts mainly through the alpha1-helices and the beta16-strands in the N-terminal domains. The C-terminal domains are not in direct contact but are relatively close 706479 5.3.3.17 homodimer - 749064