What is the molecular, electronic, and magnetic structure of enzyme active sites?

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What is the molecular, electronic, and magnetic structure of enzyme active sites?

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A good example of this kind of problem is the structure of the oxygen-evolving complex of photosystem II. Based on their EXAFS work and other information, Melvin Klein and coworkers have proposed a model for this structure. K-edge EXAFS is valuable for defining the metal-neighbor distances. Investigating the near-edge x-ray absorption fine structure (NEXAFS) in the chlorine and manganese K-edge region can yield important information about the electronic structure of this complex. • How does the concentration and chemical speciation of elements change across an organism? Living systems are not homogeneous: The gradients of metals and other elements across an organism reveal important information about structure and function. A great deal has already been done by fluorescence microscopy, including, for example, many beautiful studies of calcium waves in different organisms. However, x-ray spectromicroscopy can discover information inaccessible by other means. For example, James Penner-Ha

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