Crystal structure of TTC0807 complexed with Lysine

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.204 

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Two ATP-Binding Cassette Transporters Involved in (S)-2-Aminoethyl-Cysteine Uptake in Thermus thermophilus

Kanemaru, Y.Hasebe, F.Tomita, T.Kuzuyama, T.Nishiyama, M.

(2013) J Bacteriol 195: 3845-3853

  • DOI: https://doi.org/10.1128/JB.00202-13
  • Primary Citation of Related Structures:  
    3VV5, 3VVD, 3VVE, 3VVF

  • PubMed Abstract: 

    Thermus thermophilus exhibits hypersensitivity to a lysine analog, (S)-2-aminoethyl-cysteine (AEC). Cosmid libraries were constructed using genomes from two AEC-resistant mutants, AT10 and AT14, and the cosmids that conferred AEC resistance on the wild-type strain were isolated. When the cosmid library for mutant AT14 was screened, two independent cosmids, conferring partial AEC resistance to the wild type, were obtained. Two cosmids carried a common genomic region from TTC0795 to TTC0810. This region contains genes encoding an ATP-binding cassette (ABC) transporter consisting of TTC0806/TTC0795, using TTC0807 as the periplasmic substrate-binding protein. Sequencing revealed that AT14 carries mutations in TTC0795 and TTC0969, causing decreases in the thermostability of the products. TTC0969 encodes the nucleotide-binding protein of a different ABC transporter consisting of TTC0967/TTC0968/TTC0969/TTC0970 using TTC0966 as the periplasmic substrate-binding protein. By similar screening for cosmids constructed for the mutant AT10, mutations were found at TTC0807 and TTC0969. Mutation in either of the transporter components gave partial resistance to AEC in the wild-type strain, while mutations of both transporters conferred complete AEC resistance. This result indicates that both transporters are involved in AEC uptake in T. thermophilus. To elucidate the mechanism of AEC uptake, crystal structures of TTC0807 were determined in several substrate-binding forms. The structures revealed that TTC0807 recognizes various basic amino acids by changing the side-chain conformation of Glu19, which interacts with the side-chain amino groups of the substrates.

  • Organizational Affiliation

    Biotechnology Research Center, The University of Tokyo, Tokyo, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Amino acid ABC transporter, binding protein
A, B
260Thermus thermophilus HB27Mutation(s): 0 
Gene Names: TTC0807TT_C0807
Find proteins for Q72JG5 (Thermus thermophilus (strain ATCC BAA-163 / DSM 7039 / HB27))
Explore Q72JG5 
Go to UniProtKB:  Q72JG5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ72JG5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.204 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.844α = 90
b = 71.965β = 90
c = 105.838γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-06-26
    Type: Initial release
  • Version 1.1: 2013-09-04
    Changes: Database references
  • Version 1.2: 2023-11-08
    Changes: Data collection, Database references, Derived calculations, Refinement description