5DCX

Structural studies of AAV2 Rep68 reveal a partially structured linker and compact domain conformation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 

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This is version 1.4 of the entry. See complete history


Literature

Structural Studies of AAV2 Rep68 Reveal a Partially Structured Linker and Compact Domain Conformation.

Musayev, F.N.Zarate-Perez, F.Bardelli, M.Bishop, C.Saniev, E.F.Linden, R.M.Henckaerts, E.Escalante, C.R.

(2015) Biochemistry 54: 5907-5919

  • DOI: 10.1021/acs.biochem.5b00610
  • Primary Citation of Related Structures:  
    5DCX, 4ZO0

  • PubMed Abstract: 
  • Adeno-associated virus (AAV) nonstructural proteins Rep78 and Rep68 carry out all DNA transactions that regulate the AAV life cycle. They share two multifunctional domains: an N-terminal origin binding/nicking domain (OBD) from the HUH superfamily and a SF3 helicase domain ...

    Adeno-associated virus (AAV) nonstructural proteins Rep78 and Rep68 carry out all DNA transactions that regulate the AAV life cycle. They share two multifunctional domains: an N-terminal origin binding/nicking domain (OBD) from the HUH superfamily and a SF3 helicase domain. A short linker of ∼20 amino acids that is critical for oligomerization and function connects the two domains. Although X-ray structures of the AAV5 OBD and AAV2 helicase domains have been determined, information about the full-length protein and linker conformation is not known. This article presents the solution structure of AAV2 Rep68 using small-angle X-ray scattering (SAXS). We first determined the X-ray structures of the minimal AAV2 Rep68 OBD and of the OBD with the linker region. These X-ray structures reveal novel features that include a long C-terminal α-helix that protrudes from the core of the protein at a 45° angle and a partially structured linker. SAXS studies corroborate that the linker is not extended, and we show that a proline residue in the linker is critical for Rep68 oligomerization and function. SAXS-based rigid-body modeling of Rep68 confirms these observations, showing a compact arrangement of the two domains in which they acquire a conformation that positions key residues in all domains on one face of the protein, poised to interact with DNA.


    Organizational Affiliation

    Department of Infectious Diseases, King's College London , London SE1 9RT, United Kingdom.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein Rep68
A, B, C, D, E, F, G, H
A, B, C, D, E, F, G, H, I, J, K
227Adeno-associated virus - 2Mutation(s): 1 
Gene Names: Rep68
EC: 3.6.4.12
UniProt
Find proteins for P03132 (Adeno-associated virus 2 (isolate Srivastava/1982))
Explore P03132 
Go to UniProtKB:  P03132
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.644α = 90
b = 178.706β = 91.66
c = 130.358γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
d*TREKdata scaling
PDB_EXTRACTdata extraction
d*TREKdata reduction
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01-GM092854

Revision History  (Full details and data files)

  • Version 1.0: 2015-09-23
    Type: Initial release
  • Version 1.1: 2015-10-14
    Changes: Database references
  • Version 1.2: 2017-09-13
    Changes: Author supporting evidence, Database references, Derived calculations
  • Version 1.3: 2017-11-22
    Changes: Refinement description
  • Version 1.4: 2019-12-25
    Changes: Author supporting evidence