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 

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

  • 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 ...

    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: 
    • 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
    • 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.,Sect.D 59: 1834


    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SIGNAL RECOGNITION PARTICLE PROTEIN
A
294Thermus aquaticusGene Names: ffh
Find proteins for O07347 (Thermus aquaticus)
Go to UniProtKB:  O07347
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
CELL DIVISION PROTEIN FTSY
D
303Thermus aquaticusGene Names: ftsY
Find proteins for P83749 (Thermus aquaticus)
Go to UniProtKB:  P83749
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

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

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

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Download CCD File 
A, D
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
GCP
Query on GCP

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

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Download CCD File 
A
N1-CARBOXYPIPERAZINE
C5 H10 N2 O2
RFIOZSIHFNEKFF-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 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 98.905α = 90.00
b = 98.905β = 90.00
c = 130.745γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
BEASTphasing
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

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