5LHT

ATP Phosphoribosyltransferase from Mycobacterium tuberculosis in complex with the allosteric activator 3-(2-Thienyl)-L-alanine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.06 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.194 

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


Literature

Uncoupling conformational states from activity in an allosteric enzyme.

Pisco, J.P.Chiara, C.Pacholarz, K.J.Garza-Garcia, A.Ogrodowicz, R.W.Walker, P.A.Barran, P.E.Smerdon, S.J.Carvalho, L.P.S.

(2017) Nat Commun 8: 203-203

  • DOI: https://doi.org/10.1038/s41467-017-00224-0
  • Primary Citation of Related Structures:  
    5LHT, 5LHU

  • PubMed Abstract: 

    ATP-phosphoribosyltransferase (ATP-PRT) is a hexameric enzyme in conformational equilibrium between an open and seemingly active state and a closed and presumably inhibited form. The structure-function relationship of allosteric regulation in this system is still not fully understood. Here, we develop a screening strategy for modulators of ATP-PRT and identify 3-(2-thienyl)-L-alanine (TIH) as an allosteric activator of this enzyme. Kinetic analysis reveals co-occupancy of the allosteric sites by TIH and L-histidine. Crystallographic and native ion-mobility mass spectrometry data show that the TIH-bound activated form of the enzyme closely resembles the inhibited L-histidine-bound closed conformation, revealing the uncoupling between ATP-PRT open and closed conformations and its functional state. These findings suggest that dynamic processes are responsible for ATP-PRT allosteric regulation and that similar mechanisms might also be found in other enzymes bearing a ferredoxin-like allosteric domain.Active and inactive state ATP-phosphoribosyltransferases (ATP-PRTs) are believed to have different conformations. Here the authors show that in both states, ATP-PRT has a similar structural arrangement, suggesting that dynamic alterations are involved in ATP-PRT regulation by allosteric modulators.


  • Organizational Affiliation

    Mycobacterial Metabolism and Antibiotic Research Laboratory, The Francis Crick Institute, 1 Midland Road, London, NW1 1AT, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ATP phosphoribosyltransferase294Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: hisGRv2121cMTCY261.17c
EC: 2.4.2.17
UniProt
Find proteins for P9WMN1 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WMN1 
Go to UniProtKB:  P9WMN1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WMN1
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.06 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.194 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 117.512α = 90
b = 117.512β = 90
c = 127.356γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-07-05
    Type: Initial release
  • Version 1.1: 2017-09-13
    Changes: Database references
  • Version 1.2: 2024-01-10
    Changes: Data collection, Database references, Refinement description