1V0F

Endosialidase of Bacteriophage K1F in complex with oligomeric alpha-2,8-sialic acid


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.183 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Crystal Structure of the Polysialic Acid-Degrading Endosialidase of Bacteriophage K1F

Stummeyer, K.Dickmanns, A.Muehlenhoff, M.Gerardy-Schahn, R.Ficner, R.

(2005) Nat Struct Mol Biol 12: 90

  • DOI: 10.1038/nsmb874
  • Primary Citation of Related Structures:  
    1V0F, 1V0E

  • PubMed Abstract: 
  • Phages infecting the polysialic acid (polySia)-encapsulated human pathogen Escherichia coli K1 are equipped with capsule-degrading tailspikes known as endosialidases, which are the only identified enzymes that specifically degrade polySia. As polySia also promotes cellular plasticity and tumor metastasis in vertebrates, endosialidases are widely applied in polySia-related neurosciences and cancer research ...

    Phages infecting the polysialic acid (polySia)-encapsulated human pathogen Escherichia coli K1 are equipped with capsule-degrading tailspikes known as endosialidases, which are the only identified enzymes that specifically degrade polySia. As polySia also promotes cellular plasticity and tumor metastasis in vertebrates, endosialidases are widely applied in polySia-related neurosciences and cancer research. Here we report the crystal structures of endosialidase NF and its complex with oligomeric sialic acid. The structure NF, which reveals three distinct domains, indicates that the unique polySia specificity evolved from a combination of structural elements characteristic of exosialidases and bacteriophage tailspike proteins. The endosialidase assembles into a catalytic trimer stabilized by a triple beta-helix. Its active site differs markedly from that of exosialidases, indicating an endosialidase-specific substrate-binding mode and catalytic mechanism. Residues essential for endosialidase activity were identified by structure-based mutational analysis.


    Related Citations: 
    • Proteolytic Processing and Oligomerization of Bacteriophage-Derived Endosialidases
      Muhlenhoff, M., Stummeyer, K., Grove, M., Sauerborn, M., Gerardy-Schahn, R.
      (2003) J Biol Chem 278: 12634

    Organizational Affiliation

    Abteilung Zelluläre Chemie, Zentrum Biochemie, Medizinische Hochschule Hannover, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ENDO-ALPHA-SIALIDASE ABCDEF666Escherichia phage K1FMutation(s): 0 
EC: 3.2.1.129
Find proteins for Q04830 (Escherichia phage K1F)
Explore Q04830 
Go to UniProtKB:  Q04830
Protein Feature View
Expand
  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
N-acetyl-alpha-neuraminic acid-(2-8)-N-acetyl-alpha-neuraminic acid
G, H, I
2 N/A Oligosaccharides Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.183 
  • Space Group: P 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.54α = 90
b = 131.4β = 90
c = 346.04γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-12-13
    Type: Initial release
  • Version 1.1: 2011-05-07
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Other, Structure summary