Multiple endocytic trafficking pathways of MHC class I molecules induced by a Herpesvirus protein

The EMBO Journal
Robert E MeansJae U Jung

Abstract

The K3 protein of a human tumor-inducing herpesvirus, Kaposi's sarcoma-associated herpesvirus (KSHV), down-regulates major histocompatibility complex (MHC) class I surface expression by increasing the rate of endocytosis. In this report, we demonstrate that the internalization of MHC class I by the K3 protein is the result of multiple, consecutive trafficking pathways that accelerate the endocytosis of class I molecules, redirect them to the trans-Golgi network (TGN), and target MHC class I to the lysosomal compartment. Remarkably, these actions of K3 are functionally and genetically separable; the N-terminal zinc finger motif and the central sorting motif are involved in triggering internalization of MHC class I molecules and redirecting them to the TGN. Subsequently, the C-terminal diacidic cluster region of K3 is engaged in targeting MHC class I molecules to the lysosomal compartment. These results demonstrate a novel trafficking mechanism of MHC class I molecules induced by KSHV K3, which ensures viral escape from host immune effector recognition.

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