3JS6

Crystal structure of apo psk41 parM protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.194 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure and filament dynamics of the pSK41 actin-like ParM protein: implications for plasmid DNA segregation.

Popp, D.Xu, W.Narita, A.Brzoska, A.J.Skurray, R.A.Firth, N.Goshdastider, U.Maeda, Y.Robinson, R.C.Schumacher, M.A.

(2010) J.Biol.Chem. 285: 10130-10140

  • DOI: 10.1074/jbc.M109.071613

  • PubMed Abstract: 
  • Type II plasmid partition systems utilize ParM NTPases in coordination with a centromere-binding protein called ParR to mediate accurate DNA segregation, a process critical for plasmid retention. The Staphylococcus aureus pSK41 plasmid is a medically ...

    Type II plasmid partition systems utilize ParM NTPases in coordination with a centromere-binding protein called ParR to mediate accurate DNA segregation, a process critical for plasmid retention. The Staphylococcus aureus pSK41 plasmid is a medically important plasmid that confers resistance to multiple antibiotics, disinfectants, and antiseptics. In the first step of partition, the pSK41 ParR binds its DNA centromere to form a superhelical partition complex that recruits ParM, which then mediates plasmid separation. pSK41 ParM is homologous to R1 ParM, a known actin homologue, suggesting that it may also form filaments to drive partition. To gain insight into the partition function of ParM, we examined its ability to form filaments and determined the crystal structure of apoParM to 1.95 A. The structure shows that pSK41 ParM belongs to the actin/Hsp70 superfamily. Unexpectedly, however, pSK41 ParM shows the strongest structural homology to the archaeal actin-like protein Thermoplasma acidophilum Ta0583, rather than its functional homologue, R1 ParM. Consistent with this divergence, we find that regions shown to be involved in R1 ParM filament formation are not important in formation of pSK41 ParM polymers. These data are also consonant with our finding that pSK41 ParM forms 1-start 10/4 helices very different from the 37/17 symmetry of R1 ParM. The polymerization kinetics of pSK41 ParM also differed from that of R1 ParM. These results indicate that type II NTPases utilize different polymeric structures to drive plasmid segregation.


    Organizational Affiliation

    ERATO Actin Filament Dynamics Project, Japan Science and Technology Corporation, c/o RIKEN, Harima Institute at Spring 8, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan. dpopp@imcb.A-star.edu.sg




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Uncharacterized ParM protein
A
355Staphylococcus aureusMutation(s): 0 
Find proteins for O87364 (Staphylococcus aureus)
Go to UniProtKB:  O87364
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.194 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 49.710α = 90.00
b = 74.040β = 110.85
c = 50.630γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
SOLVEphasing
MOSFLMdata reduction
ADSCdata collection
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-01-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance