Trafficking of Ciliary Membrane Proteins by the Intraflagellar Transport/BBSome Machinery

Overview

Journal Essays Biochem

Specialty Biochemistry

Date 2018 Oct 6

PMID 30287585

Citations 82

Authors

Jenna L Wingfield

Karl-Ferdinand Lechtreck

Esben Lorentzen

Affiliations

Soon will be listed here.

Abstract

Bardet-Biedl syndrome (BBS) is a rare inherited disease caused by defects in the BBSome, an octameric complex of BBS proteins. The BBSome is conserved in most organisms with cilia, which are microtubule (MT)-based cell organelles that protrude from the cell surface and function in motility and sensing. Cilia assembly, maintenance, and function require intraflagellar transport (IFT), a bidirectional motility of multi-megadalton IFT trains propelled by molecular motors along the ciliary MTs. IFT has been shown to transport structural proteins, including tubulin, into growing cilia. The BBSome is an adapter for the transport of ciliary membrane proteins and cycles through cilia via IFT. While both the loss and the abnormal accumulation of ciliary membrane proteins have been observed in mutants, recent data converge on a model where the BBSome mainly functions as a cargo adapter for the removal of certain transmembrane and peripheral membrane proteins from cilia. Here, we review recent data on the ultrastructure of the BBSome and how the BBSome recognizes its cargoes and mediates their removal from cilia.

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