4ZC6

Crystal Structure of human GGT1 in complex with Serine Borate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.175 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Human gamma-Glutamyl Transpeptidase 1: STRUCTURES OF THE FREE ENZYME, INHIBITOR-BOUND TETRAHEDRAL TRANSITION STATES, AND GLUTAMATE-BOUND ENZYME REVEAL NOVEL MOVEMENT WITHIN THE ACTIVE SITE DURING CATALYSIS.

Terzyan, S.S.Burgett, A.W.Heroux, A.Smith, C.A.Mooers, B.H.Hanigan, M.H.

(2015) J.Biol.Chem. 290: 17576-17586

  • DOI: 10.1074/jbc.M115.659680
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • γ-Glutamyl transpeptidase 1 (GGT1) is a cell surface, N-terminal nucleophile hydrolase that cleaves glutathione and other γ-glutamyl compounds. GGT1 expression is essential in cysteine homeostasis, and its induction has been implicated in the patholo ...

    γ-Glutamyl transpeptidase 1 (GGT1) is a cell surface, N-terminal nucleophile hydrolase that cleaves glutathione and other γ-glutamyl compounds. GGT1 expression is essential in cysteine homeostasis, and its induction has been implicated in the pathology of asthma, reperfusion injury, and cancer. In this study, we report four new crystal structures of human GGT1 (hGGT1) that show conformational changes within the active site as the enzyme progresses from the free enzyme to inhibitor-bound tetrahedral transition states and finally to the glutamate-bound structure prior to the release of this final product of the reaction. The structure of the apoenzyme shows flexibility within the active site. The serine-borate-bound hGGT1 crystal structure demonstrates that serine-borate occupies the active site of the enzyme, resulting in an enzyme-inhibitor complex that replicates the enzyme's tetrahedral intermediate/transition state. The structure of GGsTop-bound hGGT1 reveals its interactions with the enzyme and why neutral phosphonate diesters are more potent inhibitors than monoanionic phosphonates. These structures are the first structures for any eukaryotic GGT that include a molecule in the active site covalently bound to the catalytic Thr-381. The glutamate-bound structure shows the conformation of the enzyme prior to release of the final product and reveals novel information regarding the displacement of the main chain atoms that form the oxyanion hole and movement of the lid loop region when the active site is occupied. These data provide new insights into the mechanism of hGGT1-catalyzed reactions and will be invaluable in the development of new classes of hGGT1 inhibitors for therapeutic use.


    Related Citations: 
    • Novel insights into eukaryotic gamma-glutamyl transpeptidase 1 from the crystal structure of the glutamate-bound human enzyme.
      West, M.,Chen, Y.,Wickham, S.,Heroux, A.,Cahill, K.,Hanigan, M.,Mooers, B.
      (2014) J.Biol. Chem 288: 31902


    Organizational Affiliation

    From the Macromolecular Crystallography Laboratory, Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73104.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Gamma-glutamyltranspeptidase 1 heavy chain
A
353Homo sapiensMutation(s): 0 
Gene Names: GGT1 (GGT)
EC: 3.4.19.13
Find proteins for P19440 (Homo sapiens)
Go to Gene View: GGT1
Go to UniProtKB:  P19440
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Gamma-glutamyltranspeptidase 1 light chain
B
189Homo sapiensMutation(s): 0 
Gene Names: GGT1 (GGT)
EC: 3.4.19.13
Find proteins for P19440 (Homo sapiens)
Go to Gene View: GGT1
Go to UniProtKB:  P19440
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
SEE
Query on SEE

Download SDF File 
Download CCD File 
B
trihydroxy(L-serinato-kappaO~3~)borate(1-)
C3 H9 B N O6
IVIUHRYRMDVYGR-REOHCLBHSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, B
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.175 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 105.182α = 90.00
b = 124.360β = 90.00
c = 103.613γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-2000data reduction
REFMACphasing
HKL-2000data collection
REFMACrefinement
HKL-2000data scaling

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 SciencesUnited StatesP20GM103640

Revision History 

  • Version 1.0: 2015-06-03
    Type: Initial release
  • Version 1.1: 2015-06-10
    Type: Database references
  • Version 1.2: 2015-07-29
    Type: Database references
  • Version 1.3: 2017-09-20
    Type: Author supporting evidence, Database references, Derived calculations, Source and taxonomy