Subunit Composition of the Human Cytoplasmic Dynein-2 Complex

Overview

Journal J Cell Sci

Specialty Cell Biology

Date 2014 Sep 11

PMID 25205765

Citations 54

Authors

David Asante

Nicola L Stevenson

David J Stephens

Affiliations

Soon will be listed here.

Abstract

Cytoplasmic dynein-2 is the motor for retrograde intraflagellar transport (IFT), and mutations in dynein-2 are known to cause skeletal ciliopathies. Here, we define for the first time the composition of the human cytoplasmic dynein-2 complex. We show that the proteins encoded by the ciliopathy genes WDR34 and WDR60 are bona fide dynein-2 intermediate chains and are both required for dynein-2 function. In addition, we identify TCTEX1D2 as a unique dynein-2 light chain that is itself required for cilia function. We define several subunits common to both dynein-1 and dynein-2, including TCTEX-1 (also known as DYNLT1) and TCTEX-3 (also known as DYNLT3), roadblock-1 (also known as DYNLRB1) and roadblock-2 (also known as DYNLRB2), and LC8-1 and LC8-2 light chains (DYNLL1 and DYNLL2, respectively). We also find that NudCD3 associates with dynein-2 as it does with dynein-1. By contrast, the common dynein-1 regulators dynactin, LIS1 (also known as PAFAH1B1) and BICD2 are not found in association with dynein-2. These data explain why mutations in either WDR34 or WDR60 cause disease, as well as identifying TCTEX1D2 as a candidate ciliopathy gene.

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