3B9Q | pdb_00003b9q

The crystal structure of cpFtsY from Arabidopsis thaliana

• PDB DOI: https://doi.org/10.2210/pdb3B9Q/pdb

• Classification: PROTEIN TRANSPORT
• Organism(s): Arabidopsis thaliana
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2007-11-06 Released: 2007-12-25 
• Deposition Author(s): Stengel, K.F., Wild, K., Sinning, I.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.75 Å
• R-Value Free: 
  0.279 (Depositor), 0.275 (DCC) 
• R-Value Work: 
  0.223 (Depositor), 0.221 (DCC) 
• R-Value Observed: 
  0.226 (Depositor) 

Starting Model: experimental

Literature

The structure of the chloroplast signal recognition particle (SRP) receptor reveals mechanistic details of SRP GTPase activation and a conserved membrane targeting site

Stengel, K.F., Holdermann, I., Wild, K., Sinning, I.

(2007) FEBS Lett 581: 5671-5676

• PubMed: 18022392 
• DOI: https://doi.org/10.1016/j.febslet.2007.11.024
• Primary Citation Related Structures: 
  3B9Q


• PubMed Abstract: 
  

  Two GTPases in the signal recognition particle and its receptor (FtsY) regulate protein targeting to the membrane by formation of a heterodimeric complex. The activation of both GTPases in the complex is essential for protein translocation. We present the crystal structure of chloroplast FtsY (cpFtsY) at 1.75 A resolution. The comparison with FtsY structures in different nucleotide bound states shows structural changes relevant for GTPase activation and provides insights in how cpFtsY is pre-organized for complex formation with cpSRP54. The structure contains an amino-terminal amphipathic helix similar to the membrane targeting sequence of Escherichia coli FtsY. In cpFtsY this motif is extended, which might be responsible for the enhanced attachment of the protein to the thylakoid membrane.

---

Organizational Affiliation: 
• Biochemie-Zentrum der Universität Heidelberg, INF 328, D-69120, Heidelberg, Germany.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 32.7 kDa 
• Atom Count: 2,493 
• Modeled Residue Count: 298 
• Deposited Residue Count: 302 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Chloroplast SRP receptor homolog, alpha subunit CPFTSY	A	302	Arabidopsis thaliana	Mutation(s): 0
UniProt
Find proteins for O80842 (Arabidopsis thaliana) Explore O80842  Go to UniProtKB:  O80842

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MLI	B [auth A]	MALONATE ION C3 H2 O4 OFOBLEOULBTSOW-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.75 Å
• R-Value Free:  0.279 (Depositor), 0.275 (DCC) 
• R-Value Work:  0.223 (Depositor), 0.221 (DCC) 
• R-Value Observed: 0.226 (Depositor) 

Space Group: I 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 87.897	α = 90
b = 84.15	β = 90
c = 99.374	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
ADSC	data collection
MOSFLM	data reduction
SCALA	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2007-12-25 
Deposition Author(s): Stengel, K.F., Wild, K., Sinning, I.

Revision History  

• Version 1.0: 2007-12-25
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2023-11-01
  Changes: Data collection, Database references, Derived calculations, Refinement description