2ZHO

Crystal structure of the regulatory subunit of aspartate kinase from Thermus thermophilus (ligand free form)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.98 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.244 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Crystal structures of the regulatory subunit of Thr-sensitive aspartate kinase from Thermus thermophilus

Yoshida, A.Tomita, T.Kono, H.Fushinobu, S.Kuzuyama, T.Nishiyama, M.

(2009) FEBS J 276: 3124-3136

  • DOI: https://doi.org/10.1111/j.1742-4658.2009.07030.x
  • Primary Citation of Related Structures:  
    2DT9, 2ZHO

  • PubMed Abstract: 

    Crystal structures of the regulatory subunit of Thr-sensitive aspartate kinase (AK; EC 2.7.2.4) from Thermus thermophilus (TtAKbeta) were determined at 2.15 A in the Thr-bound form (TtAKbeta-Thr) and at 2.98 A in the Thr-free form (TtAKbeta-free). Although both forms are crystallized as dimers, the contact surface area of the dimer interface in TtAKbeta-free (3200 A(2)) is smaller than that of TtAKbeta-Thr (3890 A(2)). Sedimentation equilibrium analyzed by ultracentrifugation revealed that TtAKbeta is present in equilibrium between a monomer and dimer, and that Thr binding shifts the equilibrium to dimer formation. In the absence of Thr, an outward shift of beta-strands near the Thr-binding site (site 1) and a concomitant loss of the electron density of the loop region between beta3 and beta4 near the Thr-binding site are observed. The mechanism of regulation by Thr is discussed on the basis of the crystal structures. TtAKbeta has higher thermostability than the regulatory subunit of Corynebacterium glutamicum AK, with a difference in denaturation temperature (T(m)) of 40 degrees C. Comparison of the crystal structures of TtAKbeta and the regulatory subunit of C. glutamicum AK showed that the well-packed hydrophobic core and high Pro content in loops contribute to the high thermostability of TtAKbeta.


  • Organizational Affiliation

    Biotechnology Research Center, The University of Tokyo, Japan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Aspartokinase
A, B, C, D, E
A, B, C, D, E, F
167Thermus thermophilusMutation(s): 0 
Gene Names: ask
EC: 2.7.2.4
UniProt
Find proteins for P61489 (Thermus thermophilus)
Explore P61489 
Go to UniProtKB:  P61489
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP61489
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.98 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.244 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 107.179α = 90
b = 107.179β = 90
c = 87.219γ = 120
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-02-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-11-01
    Changes: Data collection, Database references, Refinement description