Structure of the cathelicidin motif of protegrin-3 precursor: structural insights into the activation mechanism of an antimicrobial protein.Sanchez, J.F., Hoh, F., Strub, M.P., Aumelas, A., Dumas, C.
(2002) Structure 10: 1363-1370
- PubMed: 12377122
- DOI: https://doi.org/10.1016/s0969-2126(02)00859-6
- Primary Citation of Related Structures:
- PubMed Abstract:
Cathelicidins are a family of antimicrobial proteins isolated from leucocytes and epithelia cells that contribute to the innate host defense mechanisms in mammalians. Located in the C-terminal part of the holoprotein, the cathelicidin-derived antimicrobial peptide is liberated by a specific protease cleavage. Here, we report the X-ray structure of the cathelicidin motif of protegrin-3 solved by MAD phasing using the selenocysteine-labeled protein. Its overall structure represents a fold homologous to the cystatin family and adopts two native states, a monomer, and a domain-swapped dimer. This crystal structure is the first example of a structural characterization of the highly conserved cathelicidin motif and thus provides insights into the possible mechanism of activation of the antimicrobial protegrin peptide.
Centre de Biochimie Structurale, UMR CNRS 5048, UMR 554 INSERM, Université Montpellier I, 15 Avenue Charles Flahault, 34060 Montpellier Cedex, France.