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100 1 _ |a Röllen, Katrin
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245 _ _ |a Small-angle X-ray scattering study of the kinetics of light-dark transition in a LOV protein
260 _ _ |a Lawrence, Kan.
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520 _ _ |a Light, oxygen, voltage (LOV) photoreceptors consist of conserved photo-responsive domains in bacteria, archaea, plants and fungi, and detect blue-light via a flavin cofactor. We investigated the blue-light induced conformational transition of the dimeric photoreceptor PpSB1-LOV-R66I from Pseudomonas putida in solution by using small-angle X-ray scattering (SAXS). SAXS experiments of the fully populated light- and dark-states under steady-state conditions revealed significant structural differences between the two states that are in agreement with the known structures determined by crystallography. We followed the transition from the light- to the dark-state by using SAXS measurements in real-time. A two-state model based on the light- and dark-state conformations could describe the measured time-course SAXS data with a relaxation time τREC of ~ 34 to 35 min being larger than the recovery time found with UV/vis spectroscopy. Unlike the flavin chromophore-based UV/vis method that is sensitive to the local chromophore environment in flavoproteins, SAXS-based assay depends on protein conformational changes and provides with an alternative to measure the recovery kinetics.
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700 1 _ |a Granzin, Joachim
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700 1 _ |a Batra-Safferling, Renu
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700 1 _ |a Stadler, Andreas Maximilian
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773 _ _ |a 10.1371/journal.pone.0200746
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