3H25

Crystal structure of the catalytic domain of primase Repb' in complex with initiator DNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.226 

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This is version 1.1 of the entry. See complete history


Literature

Structure and function of primase RepB' encoded by broad-host-range plasmid RSF1010 that replicates exclusively in leading-strand mode

Geibel, S.Banchenko, S.Engel, M.Lanka, E.Saenger, W.

(2009) Proc Natl Acad Sci U S A 106: 7810-7815

  • DOI: 10.1073/pnas.0902910106
  • Primary Citation of Related Structures:  
    3H25, 3H20

  • PubMed Abstract: 
  • For the initiation of DNA replication, dsDNA is unwound by helicases. Primases then recognize specific sequences on the template DNA strands and synthesize complementary oligonucleotide primers that are elongated by DNA polymerases in leading- and lagging-strand mode ...

    For the initiation of DNA replication, dsDNA is unwound by helicases. Primases then recognize specific sequences on the template DNA strands and synthesize complementary oligonucleotide primers that are elongated by DNA polymerases in leading- and lagging-strand mode. The bacterial plasmid RSF1010 provides a model for the initiation of DNA replication, because it encodes the smallest known primase RepB' (35.9 kDa), features only 1 single-stranded primase initiation site on each strand (ssiA and ssiB, each 40 nt long with 5'- and 3'-terminal 6 and 13 single-stranded nucleotides, respectively, and nucleotides 7-27 forming a hairpin), and is replicated exclusively in leading strand mode. We present the crystal structure of full-length dumbbell-shaped RepB' consisting of an N-terminal catalytic domain separated by a long alpha-helix and tether from the C-terminal helix-bundle domain and the structure of the catalytic domain in a specific complex with the 6 5'-terminal single-stranded nucleotides and the C7-G27 base pair of ssiA, its single-stranded 3'-terminus being deleted. The catalytic domains of RepB' and the archaeal/eukaryotic family of Pri-type primases share a common fold with conserved catalytic amino acids, but RepB' lacks the zinc-binding motif typical of the Pri-type primases. According to complementation studies the catalytic domain shows primase activity only in the presence of the helix-bundle domain. Primases that are highly homologous to RepB' are encoded by broad-host-range IncQ and IncQ-like plasmids that share primase initiation sites ssiA and ssiB and high sequence identity with RSF1010.


    Organizational Affiliation

    Institut für Chemie und Biochemie/Kristallographie, Freie Universität Berlin, Takustrasse 6, D-14195 Berlin, Germany.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Replication protein BA226Plasmid RSF1010Mutation(s): 0 
Gene Names: repB
UniProt
Find proteins for Q52349 (Escherichia coli)
Explore Q52349 
Go to UniProtKB:  Q52349
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsLengthOrganismImage
SINGLE STRANDED INITIATOR DNA (SSIA)B [auth C]27N/A
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.226 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.35α = 90
b = 85.35β = 90
c = 68.89γ = 90
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-04-28
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance