1A6R

GAL6 (YEAST BLEOMYCIN HYDROLASE) MUTANT C73A

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.193 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history. 


Literature

The unusual active site of Gal6/bleomycin hydrolase can act as a carboxypeptidase, aminopeptidase, and peptide ligase.

Zheng, W., Johnston, S.A., Joshua-Tor, L.

(1998) Cell 93: 103-109

  • DOI: 10.1016/s0092-8674(00)81150-2
  • Primary Citation of Related Structures:  
    1A6R, 3GCB

  • PubMed Abstract: 

    • The Gal6 protease is in a class of cysteine peptidases identified by their ability to inactivate the anti-cancer drug bleomycin. The protein forms a barrel structure with the active sites embedded in a channel as in the proteasome. In Gal6 the C termini lie in the active site clefts ...

    The Gal6 protease is in a class of cysteine peptidases identified by their ability to inactivate the anti-cancer drug bleomycin. The protein forms a barrel structure with the active sites embedded in a channel as in the proteasome. In Gal6 the C termini lie in the active site clefts. We show that Gal6 acts as a carboxypeptidase on its C terminus to convert itself to an aminopeptidase and peptide ligase. The substrate specificity of the peptidase activity is determined by the position of the C terminus of Gal6 rather than the sequence of the substrate. We propose a model to explain these diverse activities and Gal6's singular ability to inactivate bleomycin.

    Related Citations: 
    • Crystal Structure of a Conserved Protease that Binds DNA: The Bleomycin Hydrolase, Gal6
      Joshua-Tor, L., Xu, H.E., Johnston, S.A., Rees, D.C.
      (1995) Science 269: 945
    Organizational Affiliation: 

    Center for Biomedical Inventions, Department of Medicine, University of Texas-Southwestern Medical Center, Dallas 75235-8573, USA.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
GAL6A471Saccharomyces cerevisiaeMutation(s): 1 
Gene Names: GAL6C73A
EC: 3.4.22 (PDB Primary Data), 3.4.22.40 (UniProt)
UniProt
Find proteins for Q01532 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q01532 
Go to UniProtKB:  Q01532
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ01532
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.193 
  • Space Group: P 63 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 150.676α = 90
b = 150.676β = 90
c = 90.163γ = 120
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-10-21
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2021-11-03
    Changes: Database references, Derived calculations, Other