Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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Global Symmetry: Dihedral - D3  (3D View)
Global Stoichiometry: Homo 6-mer - A6 

Biological assembly 1 assigned by authors and generated by PISA,PQS (software)

Macromolecule Content

• Total Structure Weight: 54629.83 
• Atom Count: 3733 
• Residue Count: 471 
• Unique protein chains: 1

1A6R

GAL6 (YEAST BLEOMYCIN HYDROLASE) MUTANT C73A

• DOI: 10.2210/pdb1A6R/pdb

• Classification: HYDROLASE
• Organism(s): Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): 1 


• Deposited: 1998-02-27 Released: 1998-10-21 
• Deposition Author(s): Joshua-Tor, L., Zheng, W., Johnston, S.A.

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Experimental Data Snapshot

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

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

• PubMed: 9546396 
• Primary Citation of Related Structures:  
  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. 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.

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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




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Organizational Affiliation: 

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

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
GAL6	A	471	Saccharomyces cerevisiae (strain ATCC 204508 / S288c)	Mutation(s): 1  Gene Names: LAP3 (BLH1, GAL6, YCP1) EC: 3.4.22.40
Find proteins for Q01532 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Go to Gene View: LAP3 Go to UniProtKB:  Q01532

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
SO4	A	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.05 Å
• R-Value Free: 0.257 
• R-Value Work: 0.193 
• Space Group: P 6₃ 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 150.676	α = 90.00
b = 150.676	β = 90.00
c = 90.163	γ = 120.00

Software Package:

Software Name	Purpose
X-PLOR	phasing
SCALEPACK	data scaling
X-PLOR	model building
X-PLOR	refinement
DENZO	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-02-27 
• Released Date: 1998-10-21 
• Deposition Author(s): Joshua-Tor, L., Zheng, W., Johnston, S.A.

Revision History 

• Version 1.0: 1998-10-21
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Derived calculations, Version format compliance