PMID: 9448284Mar 14, 1998Paper

Exit of major histocompatibility complex class II-invariant chain p35 complexes from the endoplasmic reticulum is modulated by phosphorylation

Proceedings of the National Academy of Sciences of the United States of America
T KuwanaL Karlsson

Abstract

The Iip35 isoform of the major histocompatibility complex (MHC) class II-associated invariant chain (Ii) contains an endoplasmic reticulum (ER) targeting motif, but in B cell lines the ER retention is ineffective and a fraction of Iip35 is transported through the Golgi complex associated with class II molecules. We found Iip35 (but not Iip33, the major form of Ii) to be phosphorylated in B cell lines, as well as in transfected HeLa cells. The phosphorylation of Iip35 was found to be necessary for the exit of Iip35-class II complexes out of the ER. This requirement suggests that phosphorylation may change the interaction with factors responsible for ER retention/retrieval, and we did find that phosphorylated Iip35 associates with 14-3-3 proteins, a family of adaptor proteins that are involved in coordinating signal transduction pathways. This finding raises the intriguing possibility that the exit of Ii-class II complexes from the ER is regulated by intracellular signaling events.

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