This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. The FAD-containing enzyme, putidaredoxin reductase (Pdr) from Pseudomonas putida catalyzes electron transfer from NADH to an iron-sulfur protein, putidaredoxin, in cytochrome P450cam monooxygenase. It also has redox active cysteines and can function as dithiol/disulfide oxidoreduction. In order to establish the oxidation state of the iron atoms/cluster during diffraction studies to determine the crystal structures, single crystal XAS of assumed oxidized and reduced (in vitro) forms of the crystals will be studied. The research addresses the question of how the structure of Pdr is related to its catalytic function. This project will also involve radiation damage studies.
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