3K6V

M. acetivorans Molybdate-Binding Protein (ModA) in Citrate-Bound Open Form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.69 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.189 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Apo and ligand-bound structures of ModA from the archaeon Methanosarcina acetivorans

Chan, S.Giuroiu, I.Chernishof, I.Sawaya, M.R.Chiang, J.Gunsalus, R.P.Arbing, M.A.Perry, L.J.

(2010) Acta Crystallogr.,Sect.F 66: 242-250

  • DOI: 10.1107/S1744309109055158
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The trace-element oxyanion molybdate, which is required for the growth of many bacterial and archaeal species, is transported into the cell by an ATP-binding cassette (ABC) transporter superfamily uptake system called ModABC. ModABC consists of the M ...

    The trace-element oxyanion molybdate, which is required for the growth of many bacterial and archaeal species, is transported into the cell by an ATP-binding cassette (ABC) transporter superfamily uptake system called ModABC. ModABC consists of the ModA periplasmic solute-binding protein, the integral membrane-transport protein ModB and the ATP-binding and hydrolysis cassette protein ModC. In this study, X-ray crystal structures of ModA from the archaeon Methanosarcina acetivorans (MaModA) have been determined in the apoprotein conformation at 1.95 and 1.69 A resolution and in the molybdate-bound conformation at 2.25 and 2.45 A resolution. The overall domain structure of MaModA is similar to other ModA proteins in that it has a bilobal structure in which two mixed alpha/beta domains are linked by a hinge region. The apo MaModA is the first unliganded archaeal ModA structure to be determined: it exhibits a deep cleft between the two domains and confirms that upon binding ligand one domain is rotated towards the other by a hinge-bending motion, which is consistent with the 'Venus flytrap' model seen for bacterial-type periplasmic binding proteins. In contrast to the bacterial ModA structures, which have tetrahedral coordination of their metal substrates, molybdate-bound MaModA employs octahedral coordination of its substrate like other archaeal ModA proteins.


    Organizational Affiliation

    UCLA-DOE Institute for Genomics and Proteomics, University of California at Los Angeles, Los Angeles, CA 90095, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Solute-binding protein MA_0280
A
354Methanosarcina acetivorans (strain ATCC 35395 / DSM 2834 / JCM 12185 / C2A)Mutation(s): 0 
Find proteins for Q8TTZ5 (Methanosarcina acetivorans (strain ATCC 35395 / DSM 2834 / JCM 12185 / C2A))
Go to UniProtKB:  Q8TTZ5
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CIT
Query on CIT

Download SDF File 
Download CCD File 
A
CITRIC ACID
C6 H8 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.69 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.189 
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 81.629α = 90.00
b = 81.629β = 90.00
c = 104.636γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
DENZOdata reduction
EPMRphasing
REFMACrefinement
CrystalCleardata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-01-12
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.2: 2017-11-01
    Type: Advisory, Refinement description