5DGK

SCCmec type IV Cch - active helicase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.895 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.221 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Staphylococcal SCCmec elements encode an active MCM-like helicase and thus may be replicative.

Mir-Sanchis, I.Roman, C.A.Misiura, A.Pigli, Y.Z.Boyle-Vavra, S.Rice, P.A.

(2016) Nat.Struct.Mol.Biol. 23: 891-898

  • DOI: 10.1038/nsmb.3286

  • PubMed Abstract: 
  • Methicillin-resistant Staphylococcus aureus (MRSA) is a public-health threat worldwide. Although the mobile genomic island responsible for this phenotype, staphylococcal cassette chromosome (SCC), has been thought to be nonreplicative, we predicted D ...

    Methicillin-resistant Staphylococcus aureus (MRSA) is a public-health threat worldwide. Although the mobile genomic island responsible for this phenotype, staphylococcal cassette chromosome (SCC), has been thought to be nonreplicative, we predicted DNA-replication-related functions for some of the conserved proteins encoded by SCC. We show that one of these, Cch, is homologous to the self-loading initiator helicases of an unrelated family of genomic islands, that it is an active 3'-to-5' helicase and that the adjacent ORF encodes a single-stranded DNA-binding protein. Our 2.9-Å crystal structure of intact Cch shows that it forms a hexameric ring. Cch, like the archaeal and eukaryotic MCM-family replicative helicases, belongs to the pre-sensor II insert clade of AAA+ ATPases. Additionally, we found that SCC elements are part of a broader family of mobile elements, all of which encode a replication initiator upstream of their recombinases. Replication after excision would enhance the efficiency of horizontal gene transfer.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, The University of Chicago, Chicago, Illinois, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Active helicase
A, B
603Staphylococcus aureusMutation(s): 0 
Find proteins for Q0WXP6 (Staphylococcus aureus)
Go to UniProtKB:  Q0WXP6
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ANP
Query on ANP

Download SDF File 
Download CCD File 
A, B
PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER
C10 H17 N6 O12 P3
PVKSNHVPLWYQGJ-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.895 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.221 
  • Space Group: H 3
  • Diffraction Data DOI: 
    10.15785/SBGRID/166 SBGrid
Unit Cell:
Length (Å)Angle (°)
a = 110.140α = 90.00
b = 110.140β = 90.00
c = 302.755γ = 120.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
PHENIXphasing
SCALEPACKdata scaling
PHENIXrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited States1R21AI117593-01

Revision History 

  • Version 1.0: 2016-08-24
    Type: Initial release
  • Version 1.1: 2016-09-14
    Type: Database references
  • Version 1.2: 2016-10-19
    Type: Database references
  • Version 1.3: 2017-09-13
    Type: Author supporting evidence, Derived calculations