3L4J

Topoisomerase II-DNA cleavage complex, apo


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.48 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.240 

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This is version 1.3 of the entry. See complete history


Literature

A novel and unified two-metal mechanism for DNA cleavage by type II and IA topoisomerases.

Schmidt, B.H.Burgin, A.B.Deweese, J.E.Osheroff, N.Berger, J.M.

(2010) Nature 465: 641-644

  • DOI: 10.1038/nature08974
  • Primary Citation of Related Structures:  
    3L4J, 3L4K

  • PubMed Abstract: 
  • Type II topoisomerases are required for the management of DNA tangles and supercoils, and are targets of clinical antibiotics and anti-cancer agents. These enzymes catalyse the ATP-dependent passage of one DNA duplex (the transport or T-segment) through a transient, double-stranded break in another (the gate or G-segment), navigating DNA through the protein using a set of dissociable internal interfaces, or 'gates' ...

    Type II topoisomerases are required for the management of DNA tangles and supercoils, and are targets of clinical antibiotics and anti-cancer agents. These enzymes catalyse the ATP-dependent passage of one DNA duplex (the transport or T-segment) through a transient, double-stranded break in another (the gate or G-segment), navigating DNA through the protein using a set of dissociable internal interfaces, or 'gates'. For more than 20 years, it has been established that a pair of dimer-related tyrosines, together with divalent cations, catalyse G-segment cleavage. Recent efforts have proposed that strand scission relies on a 'two-metal mechanism', a ubiquitous biochemical strategy that supports vital cellular processes ranging from DNA synthesis to RNA self-splicing. Here we present the structure of the DNA-binding and cleavage core of Saccharomyces cerevisiae topoisomerase II covalently linked to DNA through its active-site tyrosine at 2.5A resolution, revealing for the first time the organization of a cleavage-competent type II topoisomerase configuration. Unexpectedly, metal-soaking experiments indicate that cleavage is catalysed by a novel variation of the classic two-metal approach. Comparative analyses extend this scheme to explain how distantly-related type IA topoisomerases cleave single-stranded DNA, unifying the cleavage mechanisms for these two essential enzyme families. The structure also highlights a hitherto undiscovered allosteric relay that actuates a molecular 'trapdoor' to prevent subunit dissociation during cleavage. This connection illustrates how an indispensable chromosome-disentangling machine auto-regulates DNA breakage to prevent the aberrant formation of mutagenic and cytotoxic genomic lesions.


    Organizational Affiliation

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



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA topoisomerase 2A757Saccharomyces cerevisiaeMutation(s): 1 
Gene Names: N2244TOP2TOR3YNL088W
EC: 5.99.1.3 (PDB Primary Data), 5.6.2.2 (UniProt)
UniProt
Find proteins for P06786 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P06786 
Go to UniProtKB:  P06786
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP06786
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*CP*CP*TP*AP*CP*TP*GP*CP*TP*AP*C)-3')B 11N/A
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Entity ID: 3
MoleculeChainsLengthOrganismImage
DNA (5'-D(*CP*GP*CP*GP*GP*TP*AP*GP*CP*AP*GP*TP*AP*GP*G)-3')C 15N/A
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Entity ID: 4
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*GP*GP*AP*TP*GP*AP*CP*GP*AP*TP*)-3')D 10N/A
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Entity ID: 5
MoleculeChainsLengthOrganismImage
DNA (5'-D(*CP*GP*CP*GP*AP*AP*TP*CP*GP*TP*CP*AP*TP*CP*C)-3')E 15N/A
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
TSP
Query on TSP

Download Ideal Coordinates CCD File 
F [auth D]3'-THIO-THYMIDINE-5'-PHOSPHATE
C10 H15 N2 O7 P S
BORVFKJZAOEGOO-GJMOJQLCSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PTR
Query on PTR
A L-PEPTIDE LINKINGC9 H12 N O6 PTYR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.48 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.240 
  • Space Group: P 21 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.045α = 90
b = 92.416β = 90
c = 116.732γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-05-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-09-13
    Changes: Derived calculations
  • Version 1.3: 2019-07-31
    Changes: Data collection, Derived calculations