1TUE

The X-ray Structure of the Papillomavirus Helicase in Complex with its Molecular Matchmaker E2

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.219 

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This is version 1.2 of the entry. See complete history. 

Literature

The X-ray structure of the papillomavirus helicase in complex with its molecular matchmaker E2

Abbate, E.A., Berger, J.M., Botchan, M.R.

(2004) Genes Dev. 18: 1981-1996

  • DOI: 10.1101/gad.1220104

  • PubMed Abstract: 

    • DNA replication of the papillomaviruses is specified by cooperative binding of two proteins to the ori site: the enhancer E2 and the viral initiator E1, a distant member of the AAA+ family of proteins. Formation of this prereplication complex is an e ...

    DNA replication of the papillomaviruses is specified by cooperative binding of two proteins to the ori site: the enhancer E2 and the viral initiator E1, a distant member of the AAA+ family of proteins. Formation of this prereplication complex is an essential step toward the construction of a functional, multimeric E1 helicase and DNA melting. To understand how E2 interacts with E1 to regulate this process, we have solved the X-ray structure of a complex containing the HPV18 E2 activation domain bound to the helicase domain of E1. Modeling the monomers of E1 to a hexameric helicase shows that E2 blocks hexamerization of E1 by shielding a region of the E1 oligomerization surface and stabilizing a conformation of E1 that is incompatible with ATP binding. Further biochemical experiments and structural analysis show that ATP is an allosteric effector of the dissociation of E2 from E1. Our data provide the first molecular insights into how a protein can regulate the assembly of an oligomeric AAA+ complex and explain at a structural level why E2, after playing a matchmaker role by guiding E1 to the DNA, must dissociate for subsequent steps of initiation to occur. Building on previously proposed ideas, we discuss how our data advance current models for the conversion of E1 in the prereplication complex to a hexameric helicase assembly.

    Organizational Affiliation: 

    Department of Molecular and Cell Biology, Division of Biochemistry and Molecular Biology, University of California, Berkeley, 94720-3204, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Replication protein E1
A, D, F, H, K, M
212Human papillomavirus type 18Mutation(s): 0 
Gene Names: E1
EC: 3.6.4.12
Find proteins for P06789 (Human papillomavirus type 18)
Go to UniProtKB:  P06789
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Regulatory protein E2
B, E, G, J, L, Q
218Human papillomavirus type 18Mutation(s): 0 
Gene Names: E2
Find proteins for P06790 (Human papillomavirus type 18)
Go to UniProtKB:  P06790
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.219 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 82.297α = 90.00
b = 88.745β = 90.00
c = 375.027γ = 90.00
Software Package:
Software NamePurpose
SOLVEphasing
REFMACrefinement
SCALEPACKdata scaling
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-08-24
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance