2AU3

Crystal Structure of the Aquifex aeolicus primase (Zinc Binding and RNA Polymerase Domains)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crosstalk between primase subunits can act to regulate primer synthesis in trans.

Corn, J.E.Pease, P.J.Hura, G.L.Berger, J.M.

(2005) Mol.Cell 20: 391-401

  • DOI: 10.1016/j.molcel.2005.09.004

  • PubMed Abstract: 
  • The coordination of primase function within the replisome is an essential but poorly understood feature of lagging strand synthesis. By using crystallography and small-angle X-ray scattering (SAXS), we show that functional elements of bacterial prima ...

    The coordination of primase function within the replisome is an essential but poorly understood feature of lagging strand synthesis. By using crystallography and small-angle X-ray scattering (SAXS), we show that functional elements of bacterial primase transition between two dominant conformations: an extended form that uncouples a regulatory domain from its associated RNA polymerase core and a compact state that sequesters the regulatory region from the site of primer synthesis. FRET studies and priming assays reveal that the regulatory domain of one primase subunit productively associates with nucleic acid that is bound to the polymerase domain of a second protomer in trans. This intersubunit interaction allows primase to select initiation sites on template DNA and implicates the regulatory domain as a "molecular brake" that restricts primer length. Our data suggest that the replisome may cooperatively use multiple primases and this conformational switch to control initiation frequency, processivity, and ultimately, Okazaki fragment synthesis.


    Organizational Affiliation

    Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, California 94720, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA primase
A
407Aquifex aeolicus (strain VF5)Mutation(s): 0 
Gene Names: dnaG
EC: 2.7.7.-
Find proteins for O67465 (Aquifex aeolicus (strain VF5))
Go to UniProtKB:  O67465
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.203 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 43.222α = 90.00
b = 66.403β = 90.00
c = 138.157γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
SCALEPACKdata scaling
REFMACrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-11-15
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance