2FZC

The Structure of Wild-Type E. Coli Aspartate Transcarbamoylase in Complex with Novel T State Inhibitors at 2.10 Resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.196 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

T-state Inhibitors of E. coli Aspartate Transcarbamoylase that Prevent the Allosteric Transition.

Heng, S.Stieglitz, K.A.Eldo, J.Xia, J.Cardia, J.P.Kantrowitz, E.R.

(2006) Biochemistry 45: 10062-10071

  • DOI: https://doi.org/10.1021/bi0601095
  • Primary Citation of Related Structures:  
    2FZC, 2FZG, 2FZK

  • PubMed Abstract: 

    Escherichia coli aspartate transcarbamoylase (ATCase) catalyzes the committed step in pyrimidine nucleotide biosynthesis, the reaction between carbamoyl phosphate (CP) and l-aspartate to form N-carbamoyl-l-aspartate and inorganic phosphate. The enzyme exhibits homotropic cooperativity and is allosterically regulated. Upon binding l-aspartate in the presence of a saturating concentration of CP, the enzyme is converted from the low-activity low-affinity T state to the high-activity high-affinity R state. The potent inhibitor N-phosphonacetyl-l-aspartate (PALA), which combines the binding features of Asp and CP into one molecule, has been shown to induce the allosteric transition to the R state. In the presence of only CP, the enzyme is the T structure with the active site primed for the binding of aspartate. In a structure of the enzyme-CP complex (T(CP)), two CP molecules were observed in the active site approximately 7A apart, one with high occupancy and one with low occupancy. The high occupancy site corresponds to the position for CP observed in the structure of the enzyme with CP and the aspartate analogue succinate bound. The position of the second CP is in a unique site and does not overlap with the aspartate binding site. As a means to generate a new class of inhibitors for ATCase, the domain-open T state of the enzyme was targeted. We designed, synthesized, and characterized three inhibitors that were composed of two phosphonacetamide groups linked together. These two phosphonacetamide groups mimic the positions of the two CP molecules in the T(CP) structure. X-ray crystal structures of ATCase-inhibitor complexes revealed that each of these inhibitors bind to the T state of the enzyme and occupy the active site area. As opposed to the binding of Asp in the presence of CP or PALA, these inhibitors are unable to initiate the global T to R conformational change. Although the best of these T-state inhibitors only has a K(i) value in the micromolar range, the structural information with respect to their mode of binding provides important information for the design of second generation inhibitors that will have even higher affinity for the active site of the T state of the enzyme.


  • Organizational Affiliation

    Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Aspartate carbamoyltransferase catalytic chain
A, C
310Escherichia coliMutation(s): 0 
Gene Names: pyrB
EC: 2.1.3.2
UniProt
Find proteins for P0A786 (Escherichia coli (strain K12))
Explore P0A786 
Go to UniProtKB:  P0A786
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A786
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Aspartate carbamoyltransferase regulatory chain
B, D
153Escherichia coliMutation(s): 0 
Gene Names: pyrI
EC: 2.1.3.2
UniProt
Find proteins for P0A7F3 (Escherichia coli (strain K12))
Explore P0A7F3 
Go to UniProtKB:  P0A7F3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A7F3
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.196 
  • Space Group: P 3 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 120.59α = 90
b = 120.59β = 90
c = 141.71γ = 120
Software Package:
Software NamePurpose
CrystalCleardata collection
d*TREKdata reduction
AMoREphasing
CNSrefinement
CrystalCleardata reduction
d*TREKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-08-29
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-30
    Changes: Data collection, Database references, Derived calculations, Refinement description