3UBY

Crystal structure of human alklyadenine DNA glycosylase in a lower and higher-affinity complex with DNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Searching for DNA lesions: structural evidence for lower- and higher-affinity DNA binding conformations of human alkyladenine DNA glycosylase.

Setser, J.W.Lingaraju, G.M.Davis, C.A.Samson, L.D.Drennan, C.L.

(2012) Biochemistry 51: 382-390

  • DOI: 10.1021/bi201484k

  • PubMed Abstract: 
  • To efficiently repair DNA, human alkyladenine DNA glycosylase (AAG) must search the million-fold excess of unmodified DNA bases to find a handful of DNA lesions. Such a search can be facilitated by the ability of glycosylases, like AAG, to interact w ...

    To efficiently repair DNA, human alkyladenine DNA glycosylase (AAG) must search the million-fold excess of unmodified DNA bases to find a handful of DNA lesions. Such a search can be facilitated by the ability of glycosylases, like AAG, to interact with DNA using two affinities: a lower-affinity interaction in a searching process and a higher-affinity interaction for catalytic repair. Here, we present crystal structures of AAG trapped in two DNA-bound states. The lower-affinity depiction allows us to investigate, for the first time, the conformation of this protein in the absence of a tightly bound DNA adduct. We find that active site residues of AAG involved in binding lesion bases are in a disordered state. Furthermore, two loops that contribute significantly to the positive electrostatic surface of AAG are disordered. Additionally, a higher-affinity state of AAG captured here provides a fortuitous snapshot of how this enzyme interacts with a DNA adduct that resembles a one-base loop.


    Organizational Affiliation

    Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA-3-methyladenine glycosylase
A, B
219Homo sapiensMutation(s): 0 
Gene Names: MPG (AAG, ANPG, MID1)
EC: 3.2.2.21
Find proteins for P29372 (Homo sapiens)
Go to Gene View: MPG
Go to UniProtKB:  P29372
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(*GP*AP*CP*AP*TP*GP*(EDC)P*TP*TP*GP*CP*CP*T)-3')C,D13N/A
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
EDC
Query on EDC
C, D
DNA LINKINGC11 H14 N3 O7 P

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.219 
  • Space Group: P 43
Unit Cell:
Length (Å)Angle (°)
a = 41.168α = 90.00
b = 41.168β = 90.00
c = 262.546γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
REFMACrefinement
ADSCdata collection
SCALEPACKdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-12-28
    Type: Initial release
  • Version 1.1: 2012-01-11
    Type: Database references
  • Version 1.2: 2012-01-18
    Type: Atomic model
  • Version 1.3: 2012-01-25
    Type: Database references