The role of tapasin in MHC class I antigen assembly

被引:20
作者
Androlewicz, MJ
机构
[1] Univ S Florida, Coll Med, H Lee Moffitt Canc Ctr & Res Inst, Program Immunol, Tampa, FL 33612 USA
[2] Univ S Florida, Coll Med, Dept Biochem & Mol Biol, Tampa, FL 33612 USA
关键词
MHC; antigen processing; tapasin; TAP; ER;
D O I
10.1007/BF02786464
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
The discovery of tapasin has shed new light on the mechanisms of major histocompatibility complex (MHC) class I assembly in the endoplasmic reticulum (ER). Tapasin appears to play an important role in the stable assembly of class I molecules with peptide, however, the precise function of tapasin remains elusive. The pursuit of tapasin function is complicated by the observation that tapasin is not required for successful antigen presentation by all class I molecules. In addition, current data suggest that the putative role of tapasin as a bridging molecule between transporter associated with antigen presentation (TAP) and class I is only of minor importance in tapasin action, and tapasin's major role appears to be as an active cofactor in the assembly of class I. Furthermore, it is clear that class I molecules can follow multiple pathways for successful assembly in the ER. These pathways may or may not include the interaction of class I molecules with the accessory proteins tapasin, calreticulin, ERp57, or TAP. I would like to suggest that the particular pathway utilized by a given class I molecule depends more upon the availability of appropriate peptides rather than on an intrinsic property of the class I molecule, and that tapasin may serve a peptide editing function.
引用
收藏
页码:79 / 88
页数:10
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