6GWV

Molybdenum storage protein without polymolybdate clusters and ATP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.241 

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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

The Molybdenum Storage Protein: A soluble ATP hydrolysis-dependent molybdate pump.

Poppe, J.Brunle, S.Hail, R.Wiesemann, K.Schneider, K.Ermler, U.

(2018) FEBS J 285: 4602-4616

  • DOI: 10.1111/febs.14684
  • Primary Citation of Related Structures:  
    6GU5, 6GUJ, 6GWV, 6GX4

  • PubMed Abstract: 
  • A continuous FeMo cofactor supply for nitrogenase maturation is ensured in Azotobacter vinelandii by developing a cage-like molybdenum storage protein (MoSto) capable to store ca. 120 molybdate molecules ( MoO 4 2 - ) as discrete polyoxometalate (POM) clusters ...

    A continuous FeMo cofactor supply for nitrogenase maturation is ensured in Azotobacter vinelandii by developing a cage-like molybdenum storage protein (MoSto) capable to store ca. 120 molybdate molecules ( MoO 4 2 - ) as discrete polyoxometalate (POM) clusters. To gain mechanistic insight into this process, MoSto was characterized by Mo and ATP/ADP content, structural, and kinetic analysis. We defined three functionally relevant states specified by the presence of both ATP/ADP and POM clusters (MoSto funct ), of only ATP/ADP (MoSto basal ) and of neither ATP/ADP nor POM clusters (MoSto zero ), respectively. POM clusters are only produced when ATP is hydrolyzed to ADP and phosphate. V max was ca. 13 μmol phosphate ·min -1 ·mg -1 and K m for molybdate and ATP/Mg 2+ in the low micromolar range. ATP hydrolysis presumably proceeds at subunit α, inferred from a highly occupied α-ATP/Mg 2+ and a weaker occupied β-ATP/no Mg 2+ -binding site found in the MoSto funct structure. Several findings indicate that POM cluster storage is separated into a rapid ATP hydrolysis-dependent molybdate transport across the protein cage wall and a slow molybdate assembly induced by combined auto-catalytic and protein-driven processes. The cage interior, the location of the POM cluster depot, is locked in all three states and thus not rapidly accessible for molybdate from the outside. Based on V max , the entire Mo storage process should be completed in less than 10 s but requires, according to the molybdate content analysis, ca. 15 min. Long-time incubation of MoSto basal with nonphysiological high molybdate amounts implicates an equilibrium in and outside the cage and POM cluster self-formation without ATP hydrolysis. DATABASES: The crystal structures MoSto in the MoSto-F6, MoSto-F7, MoSto basal , MoSto zero , and MoSto-F1 vitro states were deposited to PDB under the accession numbers PDB 6GU5, 6GUJ, 6GWB, 6GWV, and 6GX4.


    Organizational Affiliation

    Max-Planck-Institut für Biophysik, Frankfurt am Main, Germany.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Molybdenum storage protein subunit beta269Azotobacter vinelandii DJMutation(s): 0 
Gene Names: mosBAvin_43210
UniProt
Find proteins for P84253 (Azotobacter vinelandii (strain DJ / ATCC BAA-1303))
Explore P84253 
Go to UniProtKB:  P84253
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP84253
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Molybdenum storage protein subunit alpha275Azotobacter vinelandii DJMutation(s): 0 
Gene Names: mosAAvin_43200
UniProt
Find proteins for P84308 (Azotobacter vinelandii (strain DJ / ATCC BAA-1303))
Explore P84308 
Go to UniProtKB:  P84308
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP84308
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.241 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 116.71α = 90
b = 147.3β = 107.62
c = 192.32γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-11-07
    Type: Initial release
  • Version 1.1: 2018-12-26
    Changes: Data collection, Database references