1Q32

Crystal Structure Analysis of the Yeast Tyrosyl-DNA Phosphodiesterase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.03 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.214 

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This is version 1.2 of the entry. See complete history


Literature

Mutation of a conserved active site residue converts tyrosyl-DNA phosphodiesterase I into a DNA topoisomerase I-dependent poison

He, X.van Waardenburg, R.C.Babaoglu, K.Price, A.C.Nitiss, K.C.Nitiss, J.L.Bjornsti, M.A.White, S.W.

(2007) J Mol Biol 372: 1070-1081

  • DOI: 10.1016/j.jmb.2007.07.055
  • Primary Citation of Related Structures:  
    1Q32

  • PubMed Abstract: 
  • Tyrosyl-DNA phosphodiesterase 1 (Tdp1) catalyzes the resolution of 3' and 5' phospho-DNA adducts. A defective mutant, associated with the recessive neurodegenerative disease SCAN1, accumulates Tdp1-DNA complexes in vitro. To assess the conservation of enzyme architecture, a 2 ...

    Tyrosyl-DNA phosphodiesterase 1 (Tdp1) catalyzes the resolution of 3' and 5' phospho-DNA adducts. A defective mutant, associated with the recessive neurodegenerative disease SCAN1, accumulates Tdp1-DNA complexes in vitro. To assess the conservation of enzyme architecture, a 2.0 A crystal structure of yeast Tdp1 was determined that is very similar to human Tdp1. Poorly conserved regions of primary structure are peripheral to an essentially identical catalytic core. Enzyme mechanism was also conserved, because the yeast SCAN1 mutant (H(432)R) enhanced cell sensitivity to the DNA topoisomerase I (Top1) poison camptothecin. A more severe Top1-dependent lethality of Tdp1H(432)N was drug-independent, coinciding with increased covalent Top1-DNA and Tdp1-DNA complex formation in vivo. However, both H(432) mutants were recessive to wild-type Tdp1. Thus, yeast H(432) acts in the general acid/base catalytic mechanism of Tdp1 to resolve 3' phosphotyrosyl and 3' phosphoamide linkages. However, the distinct pattern of mutant Tdp1 activity evident in yeast cells, suggests a more severe defect in Tdp1H(432)N-catalyzed resolution of 3' phospho-adducts.


    Organizational Affiliation

    Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA. Electronic address: Stephen.White@stjude.org.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
tyrosyl-DNA phosphodiesteraseA, B, C, D544Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: TDP1
EC: 3.1.4
UniProt
Find proteins for P38319 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P38319 
Go to UniProtKB:  P38319
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP38319
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.03 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.214 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.163α = 89.39
b = 82.207β = 85.81
c = 98.442γ = 67.12
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
CNSrefinement
HKL-2000data reduction
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-09-07
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance