6RU0

Light-Regulation of Imidazole Glycerol Phosphate Synthase by Interference with its Allosteric Machinery through Photo-Sensitive Unnatural Amino Acids


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.210 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Light Regulation of Enzyme Allostery through Photo-responsive Unnatural Amino Acids.

Kneuttinger, A.C.Straub, K.Bittner, P.Simeth, N.A.Bruckmann, A.Busch, F.Rajendran, C.Hupfeld, E.Wysocki, V.H.Horinek, D.Konig, B.Merkl, R.Sterner, R.

(2019) Cell Chem Biol 26: 1501-1514.e9

  • DOI: https://doi.org/10.1016/j.chembiol.2019.08.006
  • Primary Citation of Related Structures:  
    6RTZ, 6RU0

  • PubMed Abstract: 

    Imidazole glycerol phosphate synthase (ImGPS) is an allosteric bienzyme complex in which substrate binding to the synthase subunit HisF stimulates the glutaminase subunit HisH. To control this stimulation with light, we have incorporated the photo-responsive unnatural amino acids phenylalanine-4'-azobenzene (AzoF), o-nitropiperonyl-O-tyrosine (NPY), and methyl-o-nitropiperonyllysine (mNPK) at strategic positions of HisF. The light-mediated isomerization of AzoF at position 55 (fS55AzoF E ↔ fS55AzoF Z ) resulted in a reversible 10-fold regulation of HisH activity. The light-mediated decaging of NPY at position 39 (fY39NPY → fY39) and of mNPK at position 99 (fK99mNPK → fK99) led to a 4- to 6-fold increase of HisH activity. Molecular dynamics simulations explained how the unnatural amino acids interfere with the allosteric machinery of ImGPS and revealed additional aspects of HisH stimulation in wild-type ImGPS. Our findings show that unnatural amino acids can be used as a powerful tool for the spatiotemporal control of a central metabolic enzyme complex by light.


  • Organizational Affiliation

    Institute of Biophysics and Physical Biochemistry, University of Regensburg, Universitätsstrasse 31, 93053 Regensburg, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Imidazole glycerol phosphate synthase subunit HisF
A, C, E
253Thermotoga maritimaMutation(s): 0 
Gene Names: hisFTM_1036
EC: 4.3.2.10
UniProt
Find proteins for Q9X0C6 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8))
Explore Q9X0C6 
Go to UniProtKB:  Q9X0C6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9X0C6
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Imidazole glycerol phosphate synthase subunit HisH
B, D, F
201Thermotoga maritimaMutation(s): 0 
Gene Names: hisHTM_1038
EC: 4.3.2.10 (PDB Primary Data), 3.5.1.2 (PDB Primary Data)
UniProt
Find proteins for Q9X0C8 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8))
Explore Q9X0C8 
Go to UniProtKB:  Q9X0C8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9X0C8
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.210 
  • Space Group: P 32
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 95.415α = 90
b = 95.415β = 90
c = 165.93γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-05-20
    Type: Initial release
  • Version 1.1: 2024-05-15
    Changes: Data collection, Database references, Refinement description