Deubiquitylation of Protein Cargo Is Not an Essential Step in Exosome Formation

Overview

Journal Mol Cell Proteomics

Specialties Biochemistry
Cell Biology
Molecular Biology

Date 2016 Feb 18

PMID 26884507

Citations 30

Authors

Alyssa R Huebner

Lei Cheng

Poorichaya Somparn

Mark A Knepper

Robert A Fenton

Trairak Pisitkun

Affiliations

Soon will be listed here.

Abstract

Exosomes, derived from multivesicular bodies (MVBs), contain proteins and genetic materials from their cell of origin and are secreted from various cells types, including kidney epithelial cells. In general, it is thought that protein cargo is ubiquitylated but that ubiquitin is cleaved by specific deubiquitylases during the process of cargo incorporation into MVBs. Here, we provide direct evidence that, in vivo, deubiquitylation is not essential. Ubiquitin was detected within human MVBs and urinary exosomes by electron microscopy. Of the >6000 proteins identified in human urinary exosomes was mass spectrometry, 15% were ubiquitylated with various topologies (Lys63>Lys48> Lys11>Lys6>Lys29>Lys33>Lys27). A significant preference for basic amino acids upstream of ubiquitylation sites suggests specific ubiquitylation motifs. The current studies demonstrate that, in vivo, deubiquitylation of proteins is not necessary for their incorporation into MVBs and highlight that urinary exosomes are an enriched source for studying ubiquitin modifications in physiological or disease states.

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