3MC9

POTRA1-2 of the periplasmic domain of Omp85 from Anabaena


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.195 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Conserved properties of polypeptide transport-associated (POTRA) domains derived from cyanobacterial Omp85.

Koenig, P.Mirus, O.Haarmann, R.Sommer, M.S.Sinning, I.Schleiff, E.Tews, I.

(2010) J.Biol.Chem. 285: 18016-18024

  • DOI: 10.1074/jbc.M110.112649
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Proteins of the Omp85 family are conserved in all kingdoms of life. They mediate protein transport across or protein insertion into membranes and reside in the outer membranes of Gram-negative bacteria, mitochondria, and chloroplasts. Omp85 proteins ...

    Proteins of the Omp85 family are conserved in all kingdoms of life. They mediate protein transport across or protein insertion into membranes and reside in the outer membranes of Gram-negative bacteria, mitochondria, and chloroplasts. Omp85 proteins contain a C-terminal transmembrane beta-barrel and a soluble N terminus with a varying number of polypeptide-transport-associated or POTRA domains. Here we investigate Omp85 from the cyanobacterium Anabaena sp. PCC 7120. The crystallographic three-dimensional structure of the N-terminal region shows three POTRA domains, here named P1 to P3 from the N terminus. Molecular dynamics simulations revealed a hinge between P1 and P2 but in contrast show that P2 and P3 are fixed in orientation. The P2-P3 arrangement is identical as seen for the POTRA domains from proteobacterial FhaC, suggesting this orientation is a conserved feature. Furthermore, we define interfaces for protein-protein interaction in P1 and P2. P3 possesses an extended loop unique to cyanobacteria and plantae, which influences pore properties as shown by deletion. It now becomes clear how variations in structure of individual POTRA domains, as well as the different number of POTRA domains with both rigid and flexible connections make the N termini of Omp85 proteins versatile adaptors for a plentitude of functions.


    Organizational Affiliation

    Heidelberg University Biochemistry Center BZH, Im Neuenheimer Feld 328, 69120 Heidelberg, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Alr2269 protein
A, B
316Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576)Mutation(s): 0 
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Omp85-TpsB Outer Membrane Transporter Superfamily
Protein: 
anaOmp85-N POTRA domains (hexagonal crystals)
Find proteins for Q8YUR6 (Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576))
Go to UniProtKB:  Q8YUR6
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.195 
  • Space Group: P 63
Unit Cell:
Length (Å)Angle (°)
a = 108.366α = 90.00
b = 108.366β = 90.00
c = 60.238γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
PHASERphasing
SCALEPACKdata scaling
DNAdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-04-21
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance