Crystal structure of TT1020 from Thermus thermophilus HB8

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.212 

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Crystal structures of the signal transducing protein GlnK from Thermus thermophilus HB8.

Sakai, H.Wang, H.Takemoto-Hori, C.Kaminishi, T.Yamaguchi, H.Kamewari, Y.Terada, T.Kuramitsu, S.Shirouzu, M.Yokoyama, S.

(2005) J Struct Biol 149: 99-110

  • DOI: https://doi.org/10.1016/j.jsb.2004.08.007
  • Primary Citation of Related Structures:  
    1UFL, 1V3R, 1V3S, 1V9O, 1VFJ

  • PubMed Abstract: 

    The Thermus thermophilus HB8 genome encodes a signal transducing PII protein, GlnK. The crystal structures of GlnK have been determined in two different space groups, P2(1)2(1)2(1) and P3(1)21. The PII protein has the T-loop, which is essential for interactions with receptor proteins. In both crystal forms, three GlnK molecules form a trimer in the asymmetric unit. In one P2(1)2(1)2(1) crystal form, the three T-loops in the trimer are disordered, while in another P2(1)2(1)2(1) crystal form, the T-loop from one molecule in the trimer is ordered. In the P3(1)21 crystal, one T-loop is ordered while the other two T-loops are disordered. The conformations of the ordered T-loops significantly differ between the two crystal forms; one makes the alpha-helix in the middle of the T-loop, while the other has an extension of the beta-hairpin. Two different conformations are captured by the crystal contacts. The observation of multiple T-loop conformations suggests that the T-loop could potentially exhibit "polysterism," which would be important for interactions with receptor proteins. The crystal structures of the nucleotide-bound forms, GlnK.ATP and GlnK.ADP, have also been determined. ATP/ADP binding within a cleft at the interface of two adjacent T. thermophilus GlnK monomers might affect the conformation of the T-loop.

  • Organizational Affiliation

    Protein Research Group, RIKEN Genomic Sciences Center, 1-7-22 Suehiro-cho, Tsurumi, Yokohama 230-0045, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C
116Thermus thermophilusMutation(s): 0 
Find proteins for P83820 (Thermus thermophilus)
Explore P83820 
Go to UniProtKB:  P83820
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP83820
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on ADP

Download Ideal Coordinates CCD File 
D [auth A],
E [auth B],
F [auth C]
C10 H15 N5 O10 P2
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.212 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.198α = 90
b = 74.612β = 90
c = 76.691γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2005-01-11
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance