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Structure of a soluble secreted chemokine inhibitor vCCI (p35) from cowpox virus.

Most poxviruses, including variola, the causative agent of smallpox, express a secreted protein of 35 kDa, vCCI, which binds CC-chemokines with high affinity. This viral protein competes with the host cellular CC-chemokine receptors (CCRs), reducing inflammation and interfering with the host immune response. Such proteins or derivatives may have therapeutic uses as anti-inflammatory agents. We have determined the crystal structure to 1.85-A resolution of vCCI from cowpox virus, the prototype of this poxvirus virulence factor. The molecule is a beta-sandwich of topology not previously described. A patch of conserved residues on the exposed face of a beta-sheet that is strongly negatively charged might have a role in binding of CC-chemokines, which are positively charged.[1]

References

  1. Structure of a soluble secreted chemokine inhibitor vCCI (p35) from cowpox virus. Carfí, A., Smith, C.A., Smolak, P.J., McGrew, J., Wiley, D.C. Proc. Natl. Acad. Sci. U.S.A. (1999) [Pubmed]
 
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