1MWK

ParM from plasmid R1 APO form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

F-actin-like filaments formed by plasmid segregation protein ParM

Van den Ent, F.Moller-Jensen, J.Amos, L.A.Gerdes, K.Lowe, J.

(2002) EMBO J. 21: 6935-6943

  • Primary Citation of Related Structures:  1MWM

  • PubMed Abstract: 
  • It was the general belief that DNA partitioning in prokaryotes is independent of a cytoskeletal structure, which in eukaryotic cells is indispensable for DNA segregation. Recently, however, immunofluorescence microscopy revealed highly dynamic, filam ...

    It was the general belief that DNA partitioning in prokaryotes is independent of a cytoskeletal structure, which in eukaryotic cells is indispensable for DNA segregation. Recently, however, immunofluorescence microscopy revealed highly dynamic, filamentous structures along the longitudinal axis of Escherichia coli formed by ParM, a plasmid-encoded protein required for accurate segregation of low-copy-number plasmid R1. We show here that ParM polymerizes into double helical protofilaments with a longitudinal repeat similar to filamentous actin (F-actin) and MreB filaments that maintain the cell shape of non-spherical bacteria. The crystal structure of ParM with and without ADP demonstrates that it is a member of the actin family of proteins and shows a domain movement of 25 degrees upon nucleotide binding. Furthermore, the crystal structure of ParM reveals major differences in the protofilament interface compared with F-actin, despite the similar arrangement of the subunits within the filaments. Thus, there is now evidence for cytoskeletal structures, formed by actin-like filaments that are involved in plasmid partitioning in E.coli.


    Organizational Affiliation

    MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ParM
A, B
320Escherichia coliGene Names: parM (stbA)
Find proteins for P11904 (Escherichia coli)
Go to UniProtKB:  P11904
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.217 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 117.680α = 90.00
b = 72.460β = 90.00
c = 87.560γ = 90.00
Software Package:
Software NamePurpose
CNSphasing
MOSFLMdata reduction
CNSrefinement
TRUNCATEdata reduction
CCP4data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-01-28
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance