Structure of Primase-Helicase in SaPI5

Experimental Data Snapshot

  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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This is version 1.2 of the entry. See complete history

Re-refinement Note

This entry reflects an alternative modeling of the original data in: 7OLA


Staphylococcal self-loading helicases couple the staircase mechanism with inter domain high flexibility.

Qiao, C.Debiasi-Anders, G.Mir-Sanchis, I.

(2022) Nucleic Acids Res 50: 8349-8362

  • DOI: https://doi.org/10.1093/nar/gkac625
  • Primary Citation of Related Structures:  
    7OLA, 7OM0, 7PDS

  • PubMed Abstract: 

    Replication is a crucial cellular process. Replicative helicases unwind DNA providing the template strand to the polymerase and promoting replication fork progression. Helicases are multi-domain proteins which use an ATPase domain to couple ATP hydrolysis with translocation, however the role that the other domains might have during translocation remains elusive. Here, we studied the unexplored self-loading helicases called Reps, present in Staphylococcus aureus pathogenicity islands (SaPIs). Our cryoEM structures of the PriRep5 from SaPI5 (3.3 Å), the Rep1 from SaPI1 (3.9 Å) and Rep1-DNA complex (3.1Å) showed that in both Reps, the C-terminal domain (CTD) undergoes two distinct movements respect the ATPase domain. We experimentally demonstrate both in vitro and in vivo that SaPI-encoded Reps need key amino acids involved in the staircase mechanism of translocation. Additionally, we demonstrate that the CTD's presence is necessary for the maintenance of full ATPase and helicase activities. We speculate that this high interdomain flexibility couples Rep's activities as initiators and as helicases.

  • Organizational Affiliation

    Department of Medical Biochemistry and Biophysics, Umeå University, Umeå, Sweden.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA primase797Staphylococcus aureusMutation(s): 0 
Gene Names: DQV53_04810EQ90_04155G6Y10_11370HMPREF2819_07670
Find proteins for A0A1S5ZIL8 (Staphylococcus aureus)
Explore A0A1S5ZIL8 
Go to UniProtKB:  A0A1S5ZIL8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A1S5ZIL8
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Knut and Alice Wallenberg FoundationSweden--

Revision History  (Full details and data files)

  • Version 1.0: 2022-07-13
    Type: Initial release
  • Version 1.1: 2022-08-10
    Changes: Database references
  • Version 1.2: 2022-08-24
    Changes: Database references