1ML3

Evidences for a flip-flop catalytic mechanism of Trypanosoma cruzi glyceraldehyde-3-phosphate dehydrogenase, from its crystal structure in complex with reacted irreversible inhibitor 2-(2-phosphono-ethyl)-acrylic acid 4-nitro-phenyl ester


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.199 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Evidence for the Two Phosphate Binding Sites of an Analogue of the Thioacyl Intermediate for the Trypanosoma cruzi Glyceraldehyde-3-phosphate Dehydrogenase-Catalyzed Reaction, from Its Crystal Structure.

Castilho, M.S.Pavao, F.Oliva, G.Ladame, S.Willson, M.Perie, J.

(2003) Biochemistry 42: 7143-7151

  • DOI: 10.1021/bi0206107
  • Primary Citation of Related Structures:  
    1ML3

  • PubMed Abstract: 
  • Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) catalyzes the reversible oxidative phosphorylation of d-glyceraldehyde 3-phosphate (GAP) into d-glycerate 1,3-bisphosphate (1,3-diPG) in the presence of NAD(+) and inorganic phosphate (P(i)). Within the active site, two anion-binding sites were ascribed to the binding of the C3 phosphate of GAP (P(s)) and to the binding of the attacking phosphate ion (P(i)) ...

    Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) catalyzes the reversible oxidative phosphorylation of d-glyceraldehyde 3-phosphate (GAP) into d-glycerate 1,3-bisphosphate (1,3-diPG) in the presence of NAD(+) and inorganic phosphate (P(i)). Within the active site, two anion-binding sites were ascribed to the binding of the C3 phosphate of GAP (P(s)) and to the binding of the attacking phosphate ion (P(i)). The role played by these two sites in the catalytic mechanism in connection with the functional role of coenzyme exchange (NADH-NAD(+) shuttle) has been investigated by several studies leading to the C3 phosphate flipping model proposed by Skarzynski et al. [Skarzynski, T., Moody, P. C., and Wonacott, A. J. (1987) J. Mol. Biol. 193, 171-187]. This model has not yet received direct confirmation. To gain further insight into the role of both sites, we synthesized irreversible inhibitors which form with the essential cysteine residue a thioacyl enzyme analogue of the catalytic intermediate. Here we report the refined glycosomal Trypanosoma cruzi GAPDH in complex with a covalently bound GAP analogue at an improved resolution of 2.0-2.5 A. For this holo-thioacyl enzyme complex, a flip-flop movement is clearly characterized, the change from the P(i) to the P(s) binding site being correlated with the coenzyme exchange step: the weaker interaction of the intermediate when bound at the P(s) site with the cofactor allows its release and also the binding of the inorganic phosphate for the next catalytic step. This result gives strong experimental support for the generally accepted flip-flop model of the catalytic mechanism in GAPDH.


    Organizational Affiliation

    Instituto de Física de São Carlos, USP, P.O. Box 369, 13560-970 São Carlos, SP, Brazil.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Glyceraldehyde 3-phosphate dehydrogenase, glycosomalA, B, C, D359Trypanosoma cruziMutation(s): 0 
Gene Names: gapdh
EC: 1.2.1.12
UniProt
Find proteins for P22513 (Trypanosoma cruzi)
Explore P22513 
Go to UniProtKB:  P22513
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAD
Query on NAD

Download Ideal Coordinates CCD File 
E [auth B], G [auth C], I [auth D]NICOTINAMIDE-ADENINE-DINUCLEOTIDE
C21 H27 N7 O14 P2
BAWFJGJZGIEFAR-NNYOXOHSSA-N
 Ligand Interaction
CYX
Query on CYX

Download Ideal Coordinates CCD File 
F [auth B], H [auth C], J [auth D](3-FORMYL-BUT-3-ENYL)-PHOSPHONIC ACID
C5 H9 O4 P
UBLMBCUBDKMVMQ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.199 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.456α = 90
b = 85.259β = 95.61
c = 105.153γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-07-08
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance