1XEF

Crystal structure of the ATP/Mg2+ bound composite dimer of HlyB-NBD


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.222 

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This is version 1.2 of the entry. See complete history


Literature

H662 is the linchpin of ATP hydrolysis in the nucleotide-binding domain of the ABC transporter HlyB

Zaitseva, J.Jenewein, S.Jumpertz, T.Holland, I.B.Schmitt, L.

(2005) EMBO J 24: 1901-1910

  • DOI: 10.1038/sj.emboj.7600657
  • Primary Citation of Related Structures:  
    1XEF

  • PubMed Abstract: 
  • The ABC transporter HlyB is a central element of the HlyA secretion machinery, a paradigm of Type I secretion. Here, we describe the crystal structure of the HlyB-NBD (nucleotide-binding domain) with H662 replaced by Ala in complex with ATP/Mg2+. The dimer shows a composite architecture, in which two intact ATP molecules are bound at the interface of the Walker A motif and the C-loop, provided by the two monomers ...

    The ABC transporter HlyB is a central element of the HlyA secretion machinery, a paradigm of Type I secretion. Here, we describe the crystal structure of the HlyB-NBD (nucleotide-binding domain) with H662 replaced by Ala in complex with ATP/Mg2+. The dimer shows a composite architecture, in which two intact ATP molecules are bound at the interface of the Walker A motif and the C-loop, provided by the two monomers. ATPase measurements confirm that H662 is essential for activity. Based on these data, we propose a model in which E631 and H662, highly conserved among ABC transporters, form a catalytic dyad. Here, H662 acts as a 'linchpin', holding together all required parts of a complicated network of interactions between ATP, water molecules, Mg2+, and amino acids both in cis and trans, necessary for intermonomer communication. Based on biochemical experiments, we discuss the hypothesis that substrate-assisted catalysis, rather than general base catalysis might operate in ABC-ATPases.


    Organizational Affiliation

    Institute of Biochemistry, Biocenter, Johann-Wolfgang Goethe University Frankfurt, Frankfurt, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Alpha-hemolysin translocation ATP-binding protein hlyBA, B, C, D241Escherichia coliMutation(s): 1 
Gene Names: hlyB
UniProt
Find proteins for P08716 (Escherichia coli)
Explore P08716 
Go to UniProtKB:  P08716
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.222 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.926α = 90
b = 194.917β = 110.68
c = 63.706γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-06-07
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance