1OKK

HOMO-HETERODIMERIC COMPLEX OF THE SRP GTPASES


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.154 
  • R-Value Observed: 0.156 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Heterodimeric Gtpase Core of the Srp Targeting Complex

Focia, P.J.Shepotinovskaya, I.V.Seidler, J.A.Freymann, D.M.

(2004) Science 303: 373

  • DOI: 10.1126/science.1090827
  • Primary Citation of Related Structures:  
    1OKK

  • PubMed Abstract: 
  • Two structurally homologous guanosine triphosphatase (GTPase) domains interact directly during signal recognition particle (SRP)-mediated cotranslational targeting of proteins to the membrane. The 2.05 angstrom structure of a complex of the NG GTPase domains of Ffh and FtsY reveals a remarkably symmetric heterodimer sequestering a composite active site that contains two bound nucleotides ...

    Two structurally homologous guanosine triphosphatase (GTPase) domains interact directly during signal recognition particle (SRP)-mediated cotranslational targeting of proteins to the membrane. The 2.05 angstrom structure of a complex of the NG GTPase domains of Ffh and FtsY reveals a remarkably symmetric heterodimer sequestering a composite active site that contains two bound nucleotides. The structure explains the coordinate activation of the two GTPases. Conformational changes coupled to formation of their extensive interface may function allosterically to signal formation of the targeting complex to the signal-sequence binding site and the translocon. We propose that the complex represents a molecular "latch" and that its disengagement is regulated by completion of assembly of the GTPase active site.


    Related Citations: 
    • Crystallization of the Gmppcp Complex of the Ng Domains of T. Aquaticus Ffh and Ftsy
      Shepotinovskaya, I.V., Focia, P.J., Freymann, D.M.
      (2003) Acta Crystallogr D Biol Crystallogr 59: 1834
    • Conformational Change of the N-Domain on Formation of the Complex between the Gtpase Domains of Thermus Aquaticus Ffh and Ftsy
      Shepotinovskaya, I.V., Freymann, D.M.
      (2002) Biochim Biophys Acta 1597: 107
    • The Conformation of Bound Gmppnp Suggests a Mechanism for Gating the Active Site of the Srp Gtpase
      Padmanabhan, S., Freymann, D.M.
      (2001) Structure 9: 859

    Organizational Affiliation

    Department of Molecular Pharmacology and Biological Chemistry, Feinberg School of Medicine, Northwestern University, 303 East Chicago Avenue, Chicago, IL 60611, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SIGNAL RECOGNITION PARTICLE PROTEIN A294Thermus aquaticusMutation(s): 0 
Gene Names: ffh
Find proteins for O07347 (Thermus aquaticus)
Explore O07347 
Go to UniProtKB:  O07347
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
CELL DIVISION PROTEIN FTSY D303Thermus aquaticusMutation(s): 0 
Gene Names: ftsY
Find proteins for P83749 (Thermus aquaticus)
Explore P83749 
Go to UniProtKB:  P83749
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GCP
Query on GCP

Download Ideal Coordinates CCD File 
A, D
PHOSPHOMETHYLPHOSPHONIC ACID GUANYLATE ESTER
C11 H18 N5 O13 P3
PHBDHXOBFUBCJD-KQYNXXCUSA-N
 Ligand Interaction
BZP
Query on BZP

Download Ideal Coordinates CCD File 
A
N1-CARBOXYPIPERAZINE
C5 H10 N2 O2
RFIOZSIHFNEKFF-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

Download Ideal Coordinates CCD File 
A, D
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
EDO
Query on EDO

Download Ideal Coordinates CCD File 
D
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download Ideal Coordinates CCD File 
A, D
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.154 
  • R-Value Observed: 0.156 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 98.905α = 90
b = 98.905β = 90
c = 130.745γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
BEASTphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-01-19
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance