6GG9 image
Deposition Date 2018-05-03
Release Date 2018-07-25
Last Version Date 2024-01-17
Entry Detail
PDB ID:
6GG9
Title:
Crystal structures of a short blue light photoreceptor protein PpSB1-LOV mutant (dark state) - R61H/R66I
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
2.04 Å
R-Value Free:
0.23
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Sensory box protein
Gene (Uniprot):PP_4629
Mutations:R61H, R66I
Chain IDs:A, B, C, D
Chain Length:162
Number of Molecules:4
Biological Source:Pseudomonas putida
Ligand Molecules
Primary Citation
Small-angle X-ray scattering study of the kinetics of light-dark transition in a LOV protein.
PLoS ONE 13 e0200746 e0200746 (2018)
PMID: 30011332 DOI: 10.1371/journal.pone.0200746

Abstact

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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Primary Citation of related structures