4JKT

Crystal structure of mouse Glutaminase C, BPTES-bound form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.77 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.253 
  • R-Value Observed: 0.255 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Active Glutaminase C Self-assembles into a Supratetrameric Oligomer That Can Be Disrupted by an Allosteric Inhibitor.

Ferreira, A.P.Cassago, A.Goncalves Kde, A.Dias, M.M.Adamoski, D.Ascencao, C.F.Honorato, R.V.de Oliveira, J.F.Ferreira, I.M.Fornezari, C.Bettini, J.Oliveira, P.S.Paes Leme, A.F.Portugal, R.V.Ambrosio, A.L.Dias, S.M.

(2013) J Biol Chem 288: 28009-28020

  • DOI: 10.1074/jbc.M113.501346
  • Primary Citation of Related Structures:  
    4JKT

  • PubMed Abstract: 
  • The phosphate-dependent transition between enzymatically inert dimers into catalytically capable tetramers has long been the accepted mechanism for the glutaminase activation. Here, we demonstrate that activated glutaminase C (GAC) self-assembles into a helical, fiber-like double-stranded oligomer and propose a molecular model consisting of seven tetramer copies per turn per strand interacting via the N-terminal domains ...

    The phosphate-dependent transition between enzymatically inert dimers into catalytically capable tetramers has long been the accepted mechanism for the glutaminase activation. Here, we demonstrate that activated glutaminase C (GAC) self-assembles into a helical, fiber-like double-stranded oligomer and propose a molecular model consisting of seven tetramer copies per turn per strand interacting via the N-terminal domains. The loop (321)LRFNKL(326) is projected as the major regulating element for self-assembly and enzyme activation. Furthermore, the previously identified in vivo lysine acetylation (Lys(311) in humans, Lys(316) in mouse) is here proposed as an important down-regulator of superoligomer assembly and protein activation. Bis-2-(5-phenylacetamido-1,3,4-thiadiazol-2-yl)ethyl sulfide, a known glutaminase inhibitor, completely disrupted the higher order oligomer, explaining its allosteric mechanism of inhibition via tetramer stabilization. A direct correlation between the tendency to self-assemble and the activity levels of the three mammalian glutaminase isozymes was established, with GAC being the most active enzyme while forming the longest structures. Lastly, the ectopic expression of a fiber-prone superactive GAC mutant in MDA-MB 231 cancer cells provided considerable proliferative advantages to transformed cells. These findings yield unique implications for the development of GAC-oriented therapeutics targeting tumor metabolism.


    Organizational Affiliation

    From the Laboratórios Nacionais de Biociências e.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Glutaminase kidney isoform, mitochondrial ABCD479Mus musculusMutation(s): 0 
Gene Names: GlsGls1Kiaa0838
EC: 3.5.1.2
Find proteins for D3Z7P3 (Mus musculus)
Explore D3Z7P3 
Go to UniProtKB:  D3Z7P3
NIH Common Fund Data Resources
IMPC:  MGI:95752
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
04A
Query on 04A

Download Ideal Coordinates CCD File 
B, D
N,N'-[sulfanediylbis(ethane-2,1-diyl-1,3,4-thiadiazole-5,2-diyl)]bis(2-phenylacetamide)
C24 H24 N6 O2 S3
MDJIPXYRSZHCFS-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
04AIC50:  3300   nM  BindingDB
04AIC50:  8600   nM  BindingDB
04AIC50 :  80.4000015258789   nM  PDBBind
04AIC50:  81   nM  BindingDB
04AIC50:  371   nM  BindingDB
04AIC50:  100   nM  BindingDB
04AIC50:  200   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.77 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.253 
  • R-Value Observed: 0.255 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.67α = 90
b = 140.24β = 90
c = 180.89γ = 90
Software Package:
Software NamePurpose
MAR345data collection
PHASERphasing
PHENIXrefinement
MOSFLMdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-08-14
    Type: Initial release
  • Version 1.1: 2013-08-28
    Changes: Database references
  • Version 1.2: 2013-10-16
    Changes: Database references
  • Version 1.3: 2017-11-15
    Changes: Advisory, Refinement description