2E7Z

Acetylene Hydratase from Pelobacter acetylenicus

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.26 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.161 

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This is version 2.0 of the entry. See complete history. 


Literature

Structure of the non-redox-active tungsten/[4Fe:4S] enzyme acetylene hydratase

Seiffert, G.B., Ullmann, G.M., Messerschmidt, A., Schink, B., Kroneck, P.M.H., Einsle, O.

(2007) Proc Natl Acad Sci U S A 104: 3073-3077

  • DOI: 10.1073/pnas.0610407104
  • Primary Citation of Related Structures:  
    2E7Z

  • PubMed Abstract: 

    • The tungsten-iron-sulfur enzyme acetylene hydratase stands out from its class because it catalyzes a nonredox reaction, the hydration of acetylene to acetaldehyde. Sequence comparisons group the protein into the dimethyl sulfoxide reductase family, and it contains a bis-molybdopterin guanine dinucleotide-ligated tungsten atom and a cubane-type [4Fe:4S] cluster ...

    The tungsten-iron-sulfur enzyme acetylene hydratase stands out from its class because it catalyzes a nonredox reaction, the hydration of acetylene to acetaldehyde. Sequence comparisons group the protein into the dimethyl sulfoxide reductase family, and it contains a bis-molybdopterin guanine dinucleotide-ligated tungsten atom and a cubane-type [4Fe:4S] cluster. The crystal structure of acetylene hydratase at 1.26 A now shows that the tungsten center binds a water molecule that is activated by an adjacent aspartate residue, enabling it to attack acetylene bound in a distinct, hydrophobic pocket. This mechanism requires a strong shift of pK(a) of the aspartate, caused by a nearby low-potential [4Fe:4S] cluster. To access this previously unrecognized W-Asp active site, the protein evolved a new substrate channel distant from where it is found in other molybdenum and tungsten enzymes.

    Related Citations: 
    • Crystallization and preliminary X-ray analysis of the tungsten-dependent acetylene hydratase from Pelobacter acetylenicus
      Einsle, O., Niessen, H., Abt, D.J., Seiffert, G., Schink, B., Huber, R., Messerschmidt, A., Kroneck, P.M.H.
      (2005) Acta Crystallogr Sect F Struct Biol Cryst Commun 61: 299
    Organizational Affiliation: 

    Fachbereich Biologie, Universität Konstanz, 78457 Konstanz, Germany.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Acetylene hydratase AhyA727Syntrophotalea acetylenicaMutation(s): 0 
EC: 4.2.1.71 (PDB Primary Data), 4.2.1.112 (UniProt)
UniProt
Find proteins for Q71EW5 (Syntrophotalea acetylenica)
Explore Q71EW5 
Go to UniProtKB:  Q71EW5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ71EW5
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MGD
Query on MGD
Download Ideal Coordinates CCD File 
E [auth A],
F [auth A]		2-AMINO-5,6-DIMERCAPTO-7-METHYL-3,7,8A,9-TETRAHYDRO-8-OXA-1,3,9,10-TETRAAZA-ANTHRACEN-4-ONE GUANOSINE DINUCLEOTIDE
C20 H26 N10 O13 P2 S2
VQAGYJCYOLHZDH-ILXWUORBSA-N		 Ligand Interaction
SF4
Query on SF4
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D [auth A]IRON/SULFUR CLUSTER
Fe4 S4
LJBDFODJNLIPKO-VKOJMFJBAC		 Ligand Interaction
W
Query on W
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G [auth A]TUNGSTEN ION
W
FZFRVZDLZISPFJ-UHFFFAOYSA-N		 Ligand Interaction
MPD
Query on MPD
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H [auth A],
I [auth A]		(4S)-2-METHYL-2,4-PENTANEDIOL
C6 H14 O2
SVTBMSDMJJWYQN-YFKPBYRVSA-N		 Ligand Interaction
ACT
Query on ACT
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C [auth A]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M		 Ligand Interaction
NA
Query on NA
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B [auth A]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.26 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.161 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 120.776α = 90
b = 71.971β = 124.26
c = 106.76γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MAR345data collection
DENZOdata reduction
SCALEPACKdata scaling
SHELXDphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-02-27
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 2.0: 2019-09-04
    Changes: Atomic model, Data collection, Derived calculations