Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 103, Issue 38, Pages 13985-13990Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0602142103
Keywords
inflammation; protein : protein complex; NMR; chemokine-binding protein
Categories
Funding
- NIAID NIH HHS [AI47832, AI070993, R01 AI047832, R56 AI070993] Funding Source: Medline
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Chemokines (chemotactic cytokines) comprise a large family of proteins that recruit and activate leukocytes, giving chemokines a major role in both immune response and inflammation-related diseases. The poxvirus-encocled viral CC chemokine inhibitor (vCCI) binds to many CC chemokines with high affinity, acting as a potent inhibitor of chemokine action. We have used heteronuclear multidimensional NMR to determine the structure of an orthopoxvirus vCCI in complex with a human CC chemokine, MIP-1 beta (macrophage inflammatory protein 1 beta). vCCI binds to the chemokine with 1:1 stoichiometry, forming a complex of 311 aa. vCCI uses residues from its beta-sheet II to interact with a surface of MIP-1 beta that includes residues adjacent to its IN terminus, as well as residues in the 20's region and the 40's loop. This structure reveals the strategy used by vCCI to tightly bind numerous chemokines while retaining selectivity for the CC chemokine subfamily.
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