Lo81 Models for the Active Sites in the Manganese Catalase, Oxygen Evolving Complex and Vanadium Bromoper- Oxidase

LO81 MODELS FOR THE ACTIVE SITES IN THE MANGANESE CATALASE, OXYGEN EVOLVING COMPLEX AND VANADIUM BROMOPEROXIDASE. V.L. Pecoraro, X. Li, J.A. Bonadies, MS. Lab, E. Larson and S. Saadeh, Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-I 055, USA. Schiff Base and a-hydroxy acid complexes of manganese will be presented as models for the spectroscopic and reactivity behavior of oxygen metabolising manganese enzymes. Specific emphasis will be placed on evaluating the active site cluster nuclear@ and the role of calcium ion in the photosynthetic oxygen evolving enzyme. Vanadium (IV) and (V)complexes of alkoxy Schiff base ligands will be examined as models for the vanadium bromoperoxidase active site. The solution chemistry of Vanadium monomers and dimers will be presented.