4C0Z image
Deposition Date 2013-08-08
Release Date 2013-11-20
Last Version Date 2024-11-06
Entry Detail
PDB ID:
4C0Z
Keywords:
Title:
The N-terminal domain of the Streptococcus pyogenes pilus tip adhesin Cpa
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.00 Å
R-Value Free:
0.23
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 31
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:ANCILLARY PROTEIN 2
Gene (Uniprot):cpa
Chain IDs:A, B, C, D, E, F, G, H, I, J, K, L
Chain Length:215
Number of Molecules:12
Biological Source:STREPTOCOCCUS PYOGENES
Primary Citation
Structural Model for the Covalent Adhesion of the Streptococcus Pyogenes Pilus Through a Thioester Bond.
J.Biol.Chem. 289 177 ? (2014)
PMID: 24220033 DOI: 10.1074/JBC.M113.523761

Abstact

The human pathogen Streptococcus pyogenes produces pili that are essential for adhesion to host surface receptors. Cpa, the adhesin at the pilus tip, was recently shown to have a thioester-containing domain. The thioester bond is believed to be important in adhesion, implying a mechanism of covalent attachment analogous to that used by human complement factors. Here, we have characterized a second active thioester-containing domain on Cpa, the N-terminal domain of Cpa (CpaN). Expression of CpaN in Escherichia coli gave covalently linked dimers. These were shown by x-ray crystallography and mass spectrometry to comprise two CpaN molecules cross-linked by the polyamine spermidine following reaction with the thioester bonds. This cross-linked CpaN dimer provides a model for the covalent attachment of Cpa to target receptors and thus the streptococcal pilus to host cells. Similar thioester domains were identified in cell wall proteins of other Gram-positive pathogens, suggesting that thioester domains are more widely used and provide a mechanism of adhesion by covalent bonding to target molecules on host cells that mimics that used by the human complement system to eliminate pathogens.

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Primary Citation of related structures