6D9R

The substrate-bound crystal structure of HPRT (hypoxanthine phosphoribosyltransferase)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.64 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.166 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Evolution of (p)ppGpp-HPRT regulation through diversification of an allosteric oligomeric interaction.

Anderson, B.W.Liu, K.Wolak, C.Dubiel, K.She, F.Satyshur, K.A.Keck, J.L.Wang, J.D.

(2019) Elife 8: --

  • DOI: 10.7554/eLife.47534
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The alarmone (p)ppGpp regulates diverse targets, yet its target specificity and evolution remain poorly understood. Here, we elucidate the mechanism by which basal (p)ppGpp inhibits the purine salvage enzyme HPRT by sharing a conserved motif with its ...

    The alarmone (p)ppGpp regulates diverse targets, yet its target specificity and evolution remain poorly understood. Here, we elucidate the mechanism by which basal (p)ppGpp inhibits the purine salvage enzyme HPRT by sharing a conserved motif with its substrate PRPP. Intriguingly, HPRT regulation by (p)ppGpp varies across organisms and correlates with HPRT oligomeric forms. (p)ppGpp-sensitive HPRT exists as a PRPP-bound dimer or an apo- and (p)ppGpp-bound tetramer, where a dimer-dimer interface triggers allosteric structural rearrangements to enhance (p)ppGpp inhibition. Loss of this oligomeric interface results in weakened (p)ppGpp regulation. Our results reveal an evolutionary principle whereby protein oligomerization allows evolutionary change to accumulate away from a conserved binding pocket to allosterically alter specificity of ligand interaction. This principle also explains how another (p)ppGpp target GMK is variably regulated across species. Since most ligands bind near protein interfaces, we propose that this principle extends to many other protein-ligand interactions.


    Organizational Affiliation

    Department of Bacteriology, University of Wisconsin, Madison, United States.,Department of Biomolecular Chemistry, University of Wisconsin, Madison, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Hypoxanthine phosphoribosyltransferase
A, B
183Bacillus anthracisMutation(s): 0 
Gene Names: hpt
EC: 2.4.2.8
Find proteins for B9ZW32 (Bacillus anthracis)
Go to UniProtKB:  B9ZW32
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

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Download CCD File 
A, B
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
PRP
Query on PRP

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Download CCD File 
A, B
ALPHA-PHOSPHORIBOSYLPYROPHOSPHORIC ACID
C5 H13 O14 P3
PQGCEDQWHSBAJP-TXICZTDVSA-N
 Ligand Interaction
9DG
Query on 9DG

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Download CCD File 
A, B
9-DEAZAGUANINE
C6 H6 N4 O
FFYPRJYSJODFFD-UHFFFAOYSA-N
 Ligand Interaction
EDO
Query on EDO

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Download CCD File 
A, B
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
PEG
Query on PEG

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Download CCD File 
A, B
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.64 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.166 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 113.758α = 90.00
b = 113.758β = 90.00
c = 56.731γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
Cootmodel building
ADSCdata collection
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM084003
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM07215
National Science Foundation (NSF, United States)United StatesDGE-1256259

Revision History 

  • Version 1.0: 2019-05-01
    Type: Initial release
  • Version 1.1: 2019-11-13
    Type: Database references
  • Version 1.2: 2019-11-27
    Type: Author supporting evidence