Toggle Main Menu Toggle Search

Open Access padlockePrints

The molecular basis of CD1-mediated presentation of lipid antigens

Lookup NU author(s): Professor Del Besra


Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


The CD1 family of proteins mediates a newly described pathway for presentation of lipids and glycolipids for specific recognition by T cells. All four of the known human CD1 proteins (CD1a, CD1b, CD1c and CD1d) as well as murine CD1d have now been shown to mediate T-cell recognition of lipid or glycolipid antigens. These antigens include naturally occurring foreign glycolipids from intracellular pathogens or synthetic glycolipids that are related in structure to mammalian glycolipids. The CD1b and CD1d-presented antigens differ in their fine structures but reveal a general motif in which a rigid hydrophilic cap is bound to two aliphatic hydrocarbon chains. Different T-cell populations recognize individual antigens without cross-reactivity to closely related antigen structures or CD1 isoforms, documenting the complexity and fine specificity of CD1-mediated T-cell responses. Mapping of the molecular determinants of recognition for CD1b and CD1d-presented antigens reveals that T cells discriminate the fine structure of the hydrophilic cap of the antigen, but both the length and structure of the lipid chains may be altered without loss of recognition. This pattern of lipid antigen recognition may be accounted for by a simple molecular mechanism of presentation that parallels the known mechanism for presentation of peptides, but solves the special problems related to the hydrophobic chemical nature of the lipid antigens. We propose that CD1 binds antigen by accommodating the two lipid tails within the hydrophobic groove of its two membrane distal domains, positioning the rigid hydrophilic cap of the antigen on the solvent-exposed surface of the CD1 protein, where it can directly contact the T-cell antigen receptor. This model provides a molecular basis for recognition of a new and diverse set of T-cell antigens contained within the lipid bilayers of cellular membranes.

Publication metadata

Author(s): Moody DB, Besra GS, Wilson IA, Porcelli SA

Publication type: Article

Publication status: Published

Journal: Immunological Reviews

Year: 1999

Volume: 172

Issue: 1

Pages: 285-296

Print publication date: 01/12/1999

ISSN (print): 0105-2896

ISSN (electronic): 1600-065X

Publisher: Wiley-Blackwell Publishing, Inc.


DOI: 10.1111/j.1600-065X.1999.tb01373.x

PubMed id: 10631954


Altmetrics provided by Altmetric


Funder referenceFunder name