3UVU

Structural basis of nuclear import of Flap endonuclease 1 (FEN1)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.170 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural basis of nuclear import of flap endonuclease 1 (FEN1).

de Barros, A.C.Takeda, A.A.Chang, C.W.Kobe, B.Fontes, M.R.

(2012) Acta Crystallogr D Biol Crystallogr 68: 743-750

  • DOI: 10.1107/S0907444912010281
  • Primary Citation of Related Structures:  
    3UVU

  • PubMed Abstract: 
  • Flap endonuclease 1 (FEN1) is a member of the nuclease family and is structurally conserved from bacteriophages to humans. This protein is involved in multiple DNA-processing pathways, including Okazaki fragment maturation, stalled replication-fork r ...

    Flap endonuclease 1 (FEN1) is a member of the nuclease family and is structurally conserved from bacteriophages to humans. This protein is involved in multiple DNA-processing pathways, including Okazaki fragment maturation, stalled replication-fork rescue, telomere maintenance, long-patch base-excision repair and apoptotic DNA fragmentation. FEN1 has three functional motifs that are responsible for its nuclease, PCNA-interaction and nuclear localization activities, respectively. It has been shown that the C-terminal nuclear localization sequence (NLS) facilitates nuclear localization of the enzyme during the S phase of the cell cycle and in response to DNA damage. To determine the structural basis of the recognition of FEN1 by the nuclear import receptor importin α, the crystal structure of the complex of importin α with a peptide corresponding to the FEN1 NLS was solved. Structural studies confirmed the binding of the FEN1 NLS as a classical bipartite NLS; however, in contrast to the previously proposed (354)KRKX(8)KKK(367) sequence, it is the (354)KRX(10)KKAK(369) sequence that binds to importin α. This result explains the incomplete inhibition of localization that was observed on mutating residues (365)KKK(367). Acidic and polar residues in the X(10) linker region close to the basic clusters play an important role in binding to importin α. These results suggest that the basic residues in the N-terminal basic cluster of bipartite NLSs may play roles that are more critical than those of the many basic residues in the C-terminal basic cluster.


    Organizational Affiliation

    Departamento de Física e Biofísica, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, SP 18618-970, Brazil.



Macromolecules
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Flap endonuclease 1 (Fen1) peptideB19Homo sapiensMutation(s): 0 
Gene Names: FEN1RAD2
EC: 3.1
Find proteins for P39748 (Homo sapiens)
Explore P39748 
Go to UniProtKB:  P39748
NIH Common Fund Data Resources
PHAROS  P39748
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Importin subunit alpha-2A510Mus musculusMutation(s): 0 
Gene Names: Kpna2Rch1
Find proteins for P52293 (Mus musculus)
Explore P52293 
Go to UniProtKB:  P52293
NIH Common Fund Data Resources
IMPC  MGI:103561
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.170 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.87α = 90
b = 89.561β = 90
c = 100.343γ = 90
Software Package:
Software NamePurpose
MAR345dtbdata collection
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
REFMACphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-06-27
    Type: Initial release
  • Version 1.1: 2013-01-23
    Changes: Database references
  • Version 1.2: 2020-01-29
    Changes: Data collection, Database references