7P4Y

GlnK2 from Methanothermococcus thermolithotrophicus in the apo state at a resolution of 2.3 A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.233 

Starting Model: experimental
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Literature

The Oxoglutarate Binding Site and Regulatory Mechanism Are Conserved in Ammonium Transporter Inhibitors GlnKs from Methanococcales .

Muller, M.C.Wagner, T.

(2021) Int J Mol Sci 22

  • DOI: https://doi.org/10.3390/ijms22168631
  • Primary Citation of Related Structures:  
    7P4V, 7P4Y, 7P50, 7P52

  • PubMed Abstract: 

    Protein inhibition is a natural regulatory process to control cellular metabolic fluxes. P II -family signal-transducing effectors are in this matter key regulators of the nitrogen metabolism. Their interaction with their various targets is governed by the cellular nitrogen level and the energy charge. Structural studies on GlnK, a P II -family inhibitor of the ammonium transporters (Amt), showed that the T-loops responsible for channel obstruction are displaced upon the binding of 2-oxoglutarate, magnesium and ATP in a conserved cleft. However, GlnK from Methanocaldococcus jannaschii was shown to bind 2-oxoglutarate on the tip of its T-loop, causing a moderate disruption to GlnK-Amt interaction, raising the question if methanogenic archaea use a singular adaptive strategy. Here we show that membrane fractions of Methanothermococcus thermolithotrophicus released GlnKs only in the presence of Mg-ATP and 2-oxoglutarate. This observation led us to structurally characterize the two GlnK isoforms apo or in complex with ligands. Together, our results show that the 2-oxoglutarate binding interface is conserved in GlnKs from Methanococcales , including Methanocaldococcus jannaschii , emphasizing the importance of a free carboxy-terminal group to facilitate ligand binding and to provoke the shift of the T-loop positions.


  • Organizational Affiliation

    Microbial Metabolism Research Group, Max Planck Institute for Marine Microbiology, Celsiusstraße 1, 28359 Bremen, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GlnK2 from Methanothermococcus thermolithotrophicus
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J, K, L
132Methanothermococcus thermolithotrophicus DSM 2095Mutation(s): 0 
Gene Names: glnk2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download Ideal Coordinates CCD File 
M [auth B]
N [auth B]
O [auth D]
P [auth D]
Q [auth D]
M [auth B],
N [auth B],
O [auth D],
P [auth D],
Q [auth D],
R [auth D],
S [auth E],
T [auth G],
U [auth H],
V [auth I],
W [auth J],
X [auth K],
Y [auth L]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.233 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 103.461α = 90
b = 103.46β = 90
c = 178.491γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
autoPROCdata reduction
autoPROCdata scaling
MOLREPphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Max Planck SocietyGermany--

Revision History  (Full details and data files)

  • Version 1.0: 2021-10-06
    Type: Initial release
  • Version 1.1: 2024-01-31
    Changes: Data collection, Refinement description