Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - AB Pseudo Symmetry: Cyclic - C2  (3D View)
Pseudo Stoichiometry: Homo 2-mer -A2 

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

Macromolecule Content

• Total Structure Weight: 88546.56 
• Atom Count: 4943 
• Residue Count: 764 
• Unique protein chains: 2

1JK0

Ribonucleotide reductase Y2Y4 heterodimer

• DOI: 10.2210/pdb1JK0/pdb

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


• Deposited: 2001-07-10 Released: 2001-09-05 
• Deposition Author(s): Voegtli, W.C., Perlstein, D.L., Ge, J., Stubbe, J., Rosenzweig, A.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.8 Å
• R-Value Free: 0.296 
• R-Value Work: 0.243 

Literature

Structure of the yeast ribonucleotide reductase Y2Y4 heterodimer.

Voegtli, W.C., Ge, J., Perlstein, D.L., Stubbe, J., Rosenzweig, A.C.

(2001) Proc.Natl.Acad.Sci.USA 98: 10073-10078

• PubMed: 11526233 
• DOI: 10.1073/pnas.181336398


• PubMed Abstract: 
  

The R2 subunits of class I ribonucleotide reductases (RNRs) house a diferric-tyrosyl radical (Y*) cofactor essential for DNA synthesis. In yeast, there are two R2 proteins, Y2 and Y4. Although both Y2 and Y4 are homologous to R2s from other organisms, Y4 lacks three conserved iron-binding residues, and its exact function is unclear. Y4 is required for assembly of the diferric-Y* cofactor in Y2, and the two proteins can form both homodimeric and heterodimeric complexes. The Y2Y4 heterodimer was crystallized from a mixture of the two proteins, and its structure was determined to 2.8 A resolution. Both Y2 and Y4 are completely alpha helical and resemble the mouse and Escherichia coli R2s in overall fold. Three alpha helices not observed in the mouse R2 structure are present at the Y2 N terminus, and one extra N-terminal helix is observed in Y4. In addition, one of the eight principal helices in both Y2 and Y4, alphaD, is shifted significantly from its position in mouse R2. The heterodimer interface is similar to the mouse R2 homodimer interface in size and interacting residues, but loop regions at the interface edges differ. A single metal ion, assigned as Zn(II), occupies the Fe2 position in the Y2 active site. Treatment of the crystals with Fe(II) results in difference electron density consistent with formation of a diiron center. No metal-binding site is observed in Y4. Instead, the residues in the active site region form a hydrogen-bonding network involving an arginine, two glutamic acids, and a water molecule.

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Organizational Affiliation: 

Department of Biochemistry, Northwestern University, Evanston, IL 60208, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
ribonucleoside-diphosphate reductase small chain 1	A	419	Saccharomyces cerevisiae (strain ATCC 204508 / S288c)	Mutation(s): 0  Gene Names: RNR2 (CRT6) EC: 1.17.4.1
Find proteins for P09938 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Go to UniProtKB:  P09938

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
ribonucleoside-diphosphate reductase small chain 2	B	345	Saccharomyces cerevisiae (strain ATCC 204508 / S288c)	Mutation(s): 0  Gene Names: RNR4 (CRT3) EC: 1.17.4.1
Find proteins for P49723 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Go to UniProtKB:  P49723

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
ZN	A	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.8 Å
• R-Value Free: 0.296 
• R-Value Work: 0.243 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 92.900	α = 90.00
b = 93.000	β = 90.00
c = 97.400	γ = 90.00

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
DENZO	data reduction
CNS	refinement
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-07-10 
• Released Date: 2001-09-05 
• Deposition Author(s): Voegtli, W.C., Perlstein, D.L., Ge, J., Stubbe, J., Rosenzweig, A.C.

Revision History 

• Version 1.0: 2001-09-05
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance