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D. Branch Moody,1*
David C. Young,1,2
Tan-Yun Cheng,1
Jean-Pierre Rosat,1
Carme Roura-mir,1
Peter B. O'Connor,2
Dirk M. Zajonc,5
Andrew Walz,3
Marvin J. Miller,3
Steven B. Levery,4
Ian A. Wilson,5,6
Catherine E. Costello,2
Michael B. Brenner1
Abstract:
Unlike major histocompatibility proteins, which bind peptides,CD1 proteins display lipid antigens to T cells. Here, we reportthat CD1a presents a family of previously unknown lipopeptidesfrom Mycobacterium tuberculosis, named didehydroxymycobactinsbecause of their structural relation to mycobactin siderophores.T cell activation was mediated by the ß T cell receptorsand was specific for structure of the acyl and peptidic componentsof these antigens. These studies identify a means of intracellularpathogen detection and identify lipopeptides as a biochemicalclass of antigens for T cells, which, like conventional peptides,have a potential for marked structural diversity.
1 Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital and Harvard Medical School, Smith Building Room 514, 1 Jimmy Fund Way, Boston, MA 02115, USA. 2 Mass Spectrometry Resource, Boston University School of Medicine, 715 Albany Street, R806, Boston, MA 02115, USA. 3 Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, IN 465565670, USA. 4 Department of Chemistry, University of New Hampshire, Durham, NH 02834, USA. 5 Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA. 6 Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
* To whom correspondence should be addressed. E-mail: bmoody{at}rics.bwh.harvard.edu
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