Biological Assembly 1  

 3D View: Structure | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 37.70 kDa 
• Atom Count: 2727 
• Residue Count: 315 
• Unique protein chains: 1

1A76

FLAP ENDONUCLEASE-1 FROM METHANOCOCCUS JANNASCHII

• DOI: 10.2210/pdb1A76/pdb

• Classification: 5'-3' EXO/ENDO NUCLEASE
• Organism(s): Methanocaldococcus jannaschii
• Mutation(s): No 


• Deposited: 1998-03-20 Released: 1999-08-03 
• Deposition Author(s): Hwang, K.Y., Baek, K., Kim, H., Cho, Y.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.279 
• R-Value Work: 0.214 
• R-Value Observed: 0.214 

Literature

The crystal structure of flap endonuclease-1 from Methanococcus jannaschii.

Hwang, K.Y., Baek, K., Kim, H.Y., Cho, Y.

(1998) Nat Struct Biol 5: 707-713

• PubMed: 9699635 
• DOI: 10.1038/1406
• Primary Citation of Related Structures:  
  1A77, 1A76


• PubMed Abstract: 
  

Flap endonuclease-1 (FEN-1), a structure specific nuclease, is an essential enzyme for eukaryotic DNA replication and repair. The crystal structure of FEN-1 from Methanococcus jannaschii, determined at 2.0 A resolution, reveals an active site with two metal ions residing on top of a deep cleft where several conserved acidic residues are clustered. Near the active site, a long flexible loop comprised of many basic and aromatic residues forms a hole large enough to accommodate the DNA substrate. Deletion mutations in this loop significantly decreased the nuclease activity and specificity of FEN-1, suggesting that the loop is critical for recognition and cleavage of the junction between single and double-stranded regions of flap DNA.

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Organizational Affiliation: 

Structural Biology Center, Korea Institute of Science & Technology, Seoul, South Korea.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
FLAP ENDONUCLEASE-1 PROTEIN	A	326	Methanocaldococcus jannaschii	Mutation(s): 0  EC: 3.1
Find proteins for Q58839 (Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440)) Explore Q58839  Go to UniProtKB:  Q58839

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MN	A	MANGANESE (II) ION Mn WAEMQWOKJMHJLA-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.279 
• R-Value Work: 0.214 
• R-Value Observed: 0.214 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 58.78	α = 90
b = 42.8	β = 92.26
c = 62.64	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-03-20 
• Released Date: 1999-08-03 
Deposition Author(s): Hwang, K.Y., Baek, K., Kim, H., Cho, Y.

Revision History 

• Version 1.0: 1999-08-03
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance