Abstract
The first biochemical and structural characterization of the full-length active photoreceptor BlrP1 from Klebsiella pneumoniae was recently reported by Barends et al. [Nature 459:1015–1018, (2009)]. The light-regulated catalytic function of its C-terminal c-di-guanosine monophosphate phosphodiesterase, the EAL (Glu-Ala-Leu) domain, is activated by the N-terminal sensor of blue light using the flavin adenine dinucleotide (BLUF) domain. We performed molecular dynamics simulations on the dimeric BlrP1 protein in order to examine the coupling regions that are presumably involved in transmitting light-induced structural changes which occur in the BLUF domain to the EAL domain. According to the results of simulations and an analysis of the hydrogen bonding between the respective polypeptide chains, the region containing the site on the α3α4 loop of BLUF is responsible for communication between the photosensing and catalytic domains in the dimeric BlrP1 protein.
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Acknowledgments
We are very grateful to Dr. Ilme Schlichting for helpful discussions. This work was supported in part by grants from the Deutsche Forschungsgemeinschaft FOR526 and from the Russian Foundation for Basic Research (project no. 10-03-00139). The Russian team is grateful for the use of the facilities of the supercomputing complex of the Research Computing Center of M.V. Lomonosov Moscow State University and the SKIF-GRID program for providing computational resources.
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Khrenova, M., Domratcheva, T., Grigorenko, B. et al. Coupling between the BLUF and EAL domains in the blue light-regulated phosphodiesterase BlrP1. J Mol Model 17, 1579–1586 (2011). https://doi.org/10.1007/s00894-010-0842-1
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DOI: https://doi.org/10.1007/s00894-010-0842-1