1X0P

Structure of a cyanobacterial BLUF protein, Tll0078


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.231 

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This is version 1.4 of the entry. See complete history


Literature

Structure of a Cyanobacterial BLUF Protein, Tll0078, Containing a Novel FAD-binding Blue Light Sensor Domain

Kita, A.Okajima, K.Morimoto, Y.Ikeuchi, M.Miki, K.

(2005) J Mol Biol 349: 1-9

  • DOI: https://doi.org/10.1016/j.jmb.2005.03.067
  • Primary Citation of Related Structures:  
    1X0P

  • PubMed Abstract: 

    The sensor proteins for blue light using the FAD (BLUF) domain belong to the third family of the photoreceptor proteins using a flavin chromophore, where the other two families are phototropins and cryptochromes. As the first structure of this BLUF domain, we have determined the crystal structure of the Tll0078 protein from Thermosynechococcus elongatus BP-1, which contains a BLUF domain bound to FAD, at 2A resolution. Five Tll0078 monomers are located around the non-crystallographic 5-fold axis to form a pentamer, and two pentamers related by 2-fold non-crystallographic symmetry form a decameric assembly. The monomer consists of two domains, the BLUF domain at the N-terminal region and the C-terminal domain. The overall structure of the BLUF domain consists of a five-stranded mixed beta-sheet with two alpha-helices running parallel with it. The isoalloxazine ring of FAD is accommodated in a pocket formed by several highly conserved amino acid residues in the BLUF domain. Of these, the three apparent key residues (Asn31, Asn32 and Gln50) were substituted with Ala. Mutant proteins of N31A and N32A showed a nearly normal 10nm spectral shift of the flavin upon illumination, while the Q50A mutant did not exhibit such a shift at all. On the basis of the crystal structure, we discussed a possible role of Gln50, which is structurally and functionally linked with the critical Tyr8 (FAD-Gln50-Tyr8 network), with regard to the light-induced spectral shift of the BLUF proteins.


  • Organizational Affiliation

    Research Reactor Institute, Kyoto University, Kumatori, Osaka 590-0494, Japan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
hypothetical protein Tll0078
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J
143Thermosynechococcus vestitus BP-1Mutation(s): 0 
UniProt
Find proteins for Q8DMN3 (Thermosynechococcus vestitus (strain NIES-2133 / IAM M-273 / BP-1))
Explore Q8DMN3 
Go to UniProtKB:  Q8DMN3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8DMN3
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.231 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.511α = 90
b = 109.85β = 90
c = 169.875γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
SOLVEphasing
CNSrefinement
HKL-2000data reduction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-06-07
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.3: 2018-01-24
    Changes: Experimental preparation
  • Version 1.4: 2024-03-13
    Changes: Data collection, Database references, Derived calculations