1PIX

Crystal structure of the carboxyltransferase subunit of the bacterial ion pump glutaconyl-coenzyme A decarboxylase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.201 

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This is version 1.2 of the entry. See complete history


Literature

Crystal structure of the carboxyltransferase subunit of the bacterial sodium ion pump glutaconyl-coenzyme A decarboxylase

Wendt, K.S.Schall, I.Huber, R.Buckel, W.Jacob, U.

(2003) EMBO J 22: 3493-3502

  • DOI: 10.1093/emboj/cdg358
  • Primary Citation of Related Structures:  
    1PIX

  • PubMed Abstract: 
  • Glutaconyl-CoA decarboxylase is a biotin-dependent ion pump whereby the free energy of the glutaconyl-CoA decarboxylation to crotonyl-CoA drives the electrogenic transport of sodium ions from the cytoplasm into the periplasm. Here we present the crystal structure of the decarboxylase subunit (Gcdalpha) from Acidaminococcus fermentans and its complex with glutaconyl-CoA ...

    Glutaconyl-CoA decarboxylase is a biotin-dependent ion pump whereby the free energy of the glutaconyl-CoA decarboxylation to crotonyl-CoA drives the electrogenic transport of sodium ions from the cytoplasm into the periplasm. Here we present the crystal structure of the decarboxylase subunit (Gcdalpha) from Acidaminococcus fermentans and its complex with glutaconyl-CoA. The active sites of the dimeric Gcdalpha lie at the two interfaces between the mono mers, whereas the N-terminal domain provides the glutaconyl-CoA-binding site and the C-terminal domain binds the biotinyllysine moiety. The Gcdalpha catalyses the transfer of carbon dioxide from glutaconyl-CoA to a biotin carrier (Gcdgamma) that subsequently is decarboxylated by the carboxybiotin decarboxylation site within the actual Na(+) pump (Gcdbeta). The analysis of the active site lead to a novel mechanism for the biotin-dependent carboxy transfer whereby biotin acts as general acid. Furthermore, we propose a holoenzyme assembly in which the water-filled central channel of the Gcdalpha dimer lies co-axial with the ion channel (Gcdbeta). The central channel is blocked by arginines against passage of sodium ions which might enter the central channel through two side channels.


    Organizational Affiliation

    Max-Planck-Institut für Biochemie, Abteilung Strukturforschung, Am Klopferspitz 18a, D-82152 Martinsried, Germany.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Glutaconyl-CoA decarboxylase A subunitA, B587Acidaminococcus fermentansMutation(s): 0 
Gene Names: gcdA
EC: 4.1.1.70 (PDB Primary Data), 7.2.4.5 (UniProt)
Find proteins for Q06700 (Acidaminococcus fermentans (strain ATCC 25085 / DSM 20731 / VR4))
Explore Q06700 
Go to UniProtKB:  Q06700
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.201 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 151.869α = 90
b = 151.869β = 90
c = 163γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
SHARPphasing
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-08-05
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance