3D31

ModBC from Methanosarcina acetivorans


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.251 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis of trans-inhibition in a molybdate/tungstate ABC transporter.

Gerber, S.Comellas-Bigler, M.Goetz, B.A.Locher, K.P.

(2008) Science 321: 246-250

  • DOI: 10.1126/science.1156213

  • PubMed Abstract: 
  • Transport across cellular membranes is an essential process that is catalyzed by diverse membrane transport proteins. The turnover rates of certain transporters are inhibited by their substrates in a process termed trans-inhibition, whose structural ...

    Transport across cellular membranes is an essential process that is catalyzed by diverse membrane transport proteins. The turnover rates of certain transporters are inhibited by their substrates in a process termed trans-inhibition, whose structural basis is poorly understood. We present the crystal structure of a molybdate/tungstate ABC transporter (ModBC) from Methanosarcina acetivorans in a trans-inhibited state. The regulatory domains of the nucleotide-binding subunits are in close contact and provide two oxyanion binding pockets at the shared interface. By specifically binding to these pockets, molybdate or tungstate prevent adenosine triphosphatase activity and lock the transporter in an inward-facing conformation, with the catalytic motifs of the nucleotide-binding domains separated. This allosteric effect prevents the transporter from switching between the inward-facing and the outward-facing states, thus interfering with the alternating access and release mechanism.


    Organizational Affiliation

    Institute of Molecular Biology and Biophysics, ETH Zürich, HPK D14.3, 8093 Zürich, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Sulfate/molybdate ABC transporter, ATP-binding protein
A, B
348Methanosarcina acetivorans (strain ATCC 35395 / DSM 2834 / JCM 12185 / C2A)Mutation(s): 0 
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
ModBC Molybdate ABC Transporter in a trans-inhibited state
Find proteins for Q8TTZ3 (Methanosarcina acetivorans (strain ATCC 35395 / DSM 2834 / JCM 12185 / C2A))
Go to UniProtKB:  Q8TTZ3
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Sulfate/molybdate ABC transporter, permease protein
C, D
295Methanosarcina acetivorans (strain ATCC 35395 / DSM 2834 / JCM 12185 / C2A)Mutation(s): 0 
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
ModBC Molybdate ABC Transporter in a trans-inhibited state
Find proteins for Q8TTZ4 (Methanosarcina acetivorans (strain ATCC 35395 / DSM 2834 / JCM 12185 / C2A))
Go to UniProtKB:  Q8TTZ4
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
WO4
Query on WO4

Download SDF File 
Download CCD File 
A, B
TUNGSTATE(VI)ION
O4 W
PBYZMCDFOULPGH-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.251 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 92.840α = 90.00
b = 139.460β = 90.00
c = 207.330γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
SHELXphasing
XDSdata scaling
SHELXmodel building
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-06-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2017-05-17
    Type: Data collection