1KP6

USTILAGO MAYDIS KILLER TOXIN KP6 ALPHA-SUBUNIT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.164 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure of Ustilago maydis killer toxin KP6 alpha-subunit. A multimeric assembly with a central pore.

Li, N.Erman, M.Pangborn, W.Duax, W.L.Park, C.M.Bruenn, J.Ghosh, D.

(1999) J Biol Chem 274: 20425-20431

  • DOI: 10.1074/jbc.274.29.20425
  • Primary Citation of Related Structures:  
    1KP6

  • PubMed Abstract: 
  • Ustilago maydis is a fungal pathogen of maize, some strains of which secrete killer toxins. The toxins are encoded by double-stranded RNA viruses in the cell cytoplasm. The U. maydis killer toxin KP6 contains two polypeptide chains, alpha and beta, having 79 and 81 amino acids, respectively, both of which are necessary for its killer activity ...

    Ustilago maydis is a fungal pathogen of maize, some strains of which secrete killer toxins. The toxins are encoded by double-stranded RNA viruses in the cell cytoplasm. The U. maydis killer toxin KP6 contains two polypeptide chains, alpha and beta, having 79 and 81 amino acids, respectively, both of which are necessary for its killer activity. The crystal structure of the alpha-subunit of KP6 (KP6alpha) has been determined at 1.80-A resolution. KP6alpha forms a single domain structure that has an overall shape of an ellipsoid with dimensions 40 A x 26 A x 21 A and belongs to the alpha/beta-sandwich family. The tertiary structure consists of a four-stranded antiparallel beta-sheet, a pair of antiparallel alpha-helices, a short strand along one edge of the sheet, and a short N-terminal helix. Although the fold is reminiscent of toxins of similar size, the topology of KP6alpha is distinctly different in that the alpha/beta-sandwich motif has two right-handed betaalphabeta split crossovers. Monomers of KP6alpha assemble through crystallographic symmetries, forming a hexamer with a central pore lined by hydrophobic N-terminal helices. The central pore could play an important role in the mechanism of the killing action of the toxin.


    Organizational Affiliation

    Hauptman-Woodward Medical Research Institute, Buffalo, New York 14203, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (TOXIN)A79Ustilago maydisMutation(s): 0 
UniProt
Find proteins for P16948 (Ustilago maydis P6 virus)
Explore P16948 
Go to UniProtKB:  P16948
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP16948
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download Ideal Coordinates CCD File 
B [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.164 
  • Space Group: P 63 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.3α = 90
b = 48.3β = 90
c = 124.22γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHASESphasing
X-PLORrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-07-21
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance