A molecular basis for NKT cell recognition of CD1d-self-antigen.
Immunity
; 34(3): 315-26, 2011 Mar 25.
Article
en En
| MEDLINE
| ID: mdl-21376640
ABSTRACT
The antigen receptor for natural killer T cells (NKT TCR) binds CD1d-restricted microbial and self-lipid antigens, although the molecular basis of self-CD1d recognition is unclear. Here, we have characterized NKT TCR recognition of CD1d molecules loaded with natural self-antigens (Ags) and report the 2.3 Å resolution structure of an autoreactive NKT TCR-phosphatidylinositol-CD1d complex. NKT TCR recognition of self- and foreign antigens was underpinned by a similar mode of germline-encoded recognition of CD1d. However, NKT TCR autoreactivity is mediated by unique sequences within the non-germline-encoded CDR3ß loop encoding for a hydrophobic motif that promotes self-association with CD1d. Accordingly, NKT cell autoreactivity may arise from the inherent affinity of the interaction between CD1d and the NKT TCR, resulting in the recognition of a broad range of CD1d-restricted self-antigens. This demonstrates that multiple self-antigens can be recognized in a similar manner by autoreactive NKT TCRs.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Autoantígenos
/
Células T Asesinas Naturales
/
Antígenos CD1d
Límite:
Animals
Idioma:
En
Revista:
Immunity
Asunto de la revista:
ALERGIA E IMUNOLOGIA
Año:
2011
Tipo del documento:
Article
País de afiliación:
Estados Unidos