3I7V

Crystal structure of AP4A hydrolase complexed with AP4A (ATP) (aq_158) from Aquifex aeolicus Vf5


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.194 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Free and ATP-bound structures of Ap(4)A hydrolase from Aquifex aeolicus V5

Jeyakanthan, J.Kanaujia, S.P.Nishida, Y.Nakagawa, N.Praveen, S.Shinkai, A.Kuramitsu, S.Yokoyama, S.Sekar, K.

(2010) Acta Crystallogr D Biol Crystallogr 66: 116-124

  • DOI: 10.1107/S0907444909047064
  • Primary Citation of Related Structures:  
    3I7U, 3I7V

  • PubMed Abstract: 
  • Asymmetric diadenosine tetraphosphate (Ap(4)A) hydrolases degrade the metabolite Ap(4)A back into ATP and AMP. The three-dimensional crystal structure of Ap(4)A hydrolase (16 kDa) from Aquifex aeolicus has been determined in free and ATP-bound forms ...

    Asymmetric diadenosine tetraphosphate (Ap(4)A) hydrolases degrade the metabolite Ap(4)A back into ATP and AMP. The three-dimensional crystal structure of Ap(4)A hydrolase (16 kDa) from Aquifex aeolicus has been determined in free and ATP-bound forms at 1.8 and 1.95 A resolution, respectively. The overall three-dimensional crystal structure of the enzyme shows an alphabetaalpha-sandwich architecture with a characteristic loop adjacent to the catalytic site of the protein molecule. The ATP molecule is bound in the primary active site and the adenine moiety of the nucleotide binds in a ring-stacking arrangement equivalent to that observed in the X-ray structure of Ap(4)A hydrolase from Caenorhabditis elegans. Binding of ATP in the active site induces local conformational changes which may have important implications in the mechanism of substrate recognition in this class of enzymes. Furthermore, two invariant water molecules have been identified and their possible structural and/or functional roles are discussed. In addition, modelling of the substrate molecule at the primary active site of the enzyme suggests a possible path for entry and/or exit of the substrate and/or product molecule.


    Organizational Affiliation

    Life Science Group, National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
AP4A hydrolaseAB134Aquifex aeolicus VF5Mutation(s): 0 
Gene Names: apfAaq_158
Find proteins for O66548 (Aquifex aeolicus (strain VF5))
Explore O66548 
Go to UniProtKB:  O66548
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
B4P
Query on B4P

Download CCD File 
A
BIS(ADENOSINE)-5'-TETRAPHOSPHATE
C20 H28 N10 O19 P4
YOAHKNVSNCMZGQ-XPWFQUROSA-N
 Ligand Interaction
ATP
Query on ATP

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A, B
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
 Ligand Interaction
GOL
Query on GOL

Download CCD File 
B
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
EDO
Query on EDO

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A, B
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.194 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 35.301α = 90
b = 59.234β = 92.61
c = 67.419γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
MOLREPphasing
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-07-21
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance