Abstract
CooA is a homodimeric transcription factor that belongs to the catabolite activator protein (CAP) family. Binding of CO to the heme groups of CooA leads to the transcription of genes involved in CO oxidation in Rhodospirillum rubrum. The 2.6 Å structure of reduced (Fe2+) CooA reveals that His 77 in both subunits provides one heme ligand while the N-terminal nitrogen of Pro 2 from the opposite subunit provides the other ligand. A structural comparison of CooA in the absence of effector and DNA (off state) with that of CAP in the effector and DNA bound state (on state) leads to a plausible model for the mechanism of allosteric control in this class of proteins as well as the CO dependent activation of CooA.
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Acknowledgements
The authors would like to thank M. Sundaramoorthy and H. Li for help in the initial collection and processing of data. W.N.L. would also like to thank A.L. Pearcy for providing housing in Corona del Mar/Newport Beach during the completion of this work. The authors were supported by the United States Department of Agriculture (W.N.L.), National Science Foundation (T.L.P.), and National Institutes of Health (M.V.T. and G.P.R.). This work is based upon research conducted at the SSRL, which is funded by the Department of Energy (BES, BER) and the National Institutes of Health (NCRR, NIGMS).
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Lanzilotta, W., Schuller, D., Thorsteinsson, M. et al. Structure of the CO sensing transcription activator CooA. Nat Struct Mol Biol 7, 876–880 (2000). https://doi.org/10.1038/82820
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DOI: https://doi.org/10.1038/82820
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