1M9U

Crystal Structure of Earthworm Fibrinolytic Enzyme Component A from Eisenia fetida


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.191 

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This is version 1.2 of the entry. See complete history


Literature

Crystal structure of earthworm fibrinolytic enzyme component a: revealing the structural determinants of its dual fibrinolytic activity.

Tang, Y.Liang, D.Jiang, T.Zhang, J.Gui, L.Chang, W.

(2002) J Mol Biol 321: 57-68

  • DOI: 10.1016/s0022-2836(02)00559-4
  • Primary Citation of Related Structures:  
    1M9U

  • PubMed Abstract: 
  • Earthworm fibrinolytic enzyme component A (EFEa) from Eisenia fetida is a strong fibrinolytic enzyme that not only directly degrades fibrin, but also activates plasminogen. Proteolytic assays further revealed that it cleaved behind various P1 residue types ...

    Earthworm fibrinolytic enzyme component A (EFEa) from Eisenia fetida is a strong fibrinolytic enzyme that not only directly degrades fibrin, but also activates plasminogen. Proteolytic assays further revealed that it cleaved behind various P1 residue types. The crystal structure of EFEa was determined using the MIR method and refined to 2.3A resolution. The enzyme, showing the overall polypeptide fold of chymotrypsin-like serine proteases, possesses essential S1 specificity determinants characteristic of elastase. However, the beta strand at the west rim of the S1 specificity pocket is significantly elongated by a unique four-residue insertion (Ser-Ser-Gly-Leu) after Val217, which not only provides additional substrate hydrogen binding sites for distal P residues, but also causes extension of the S1 pocket at the south rim. The S2 subsite of the enzyme was partially occluded by the bulky side-chain of residue Tyr99. Structure-based inhibitor modeling demonstrated that EFEa's S1 specificity pocket was preferable for elastase-specific small hydrophobic P1 residues, while its accommodation of long and/or bulky P1 residues was also feasible if enhanced binding of the substrate and induced fit of the S1 pocket were achieved. EFEa is thereby endowed with relatively broad substrate specificity, including the dual fibrinolysis. The presence of Tyr99 at the S2 subsite indicates a preference for P2-Gly, while an induced fit of Tyr99 was also suggested for accommodation of bigger P2 residues. This structure is the first reported for an earthworm fibrinolytic enzyme component and serine protease originating from annelid worms.


    Related Citations: 
    • Crystallization and Preliminary X-ray Analysis of Earthworm Fibrinolytic Enzyme Component A from Eisenia fetida
      Tang, Y., Zhang, J., Gui, L., Wu, C., Fan, R., Chang, W., Liang, D.
      (2000) Acta Crystallogr D Biol Crystallogr 56: 1659
    • Pancreatic Elastase
      Hartley, B.S., Shotton, D.M.
      (1971) Enzymes 3rd Ed --: 323

    Organizational Affiliation

    National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, People's Republic of China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Earthworm Fibrinolytic EnzymeA, B, C241Eisenia fetidaMutation(s): 0 
Gene Names: a1Efp-2
EC: 3.4.21
UniProt
Find proteins for Q8MX72 (Eisenia fetida)
Explore Q8MX72 
Go to UniProtKB:  Q8MX72
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8MX72
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.191 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.6α = 90
b = 126.1β = 90
c = 129.1γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
MLPHAREphasing
X-PLORrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-08-14
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance