A ternary complex comprising transportin1, Rab8 and the ciliary targeting signal directs proteins to ciliary membranes.

Abstract:

:The sensory functions of cilia are dependent on the enrichment of cilium-resident proteins. Although it is known that ciliary targeting signals (CTSs) specifically target ciliary proteins to cilia, it is still unclear how CTSs facilitate the entry and retention of cilium-resident proteins at the molecular level. We found that non-ciliary membrane reporters can passively diffuse into cilia through the lateral transport pathway, and the translocation of membrane reporters through the ciliary diffusion barrier is facilitated by importin binding motifs and domains. Screening known CTSs of ciliary membrane residents uncovered that fibrocystin, photoreceptor retinol dehydrogenase, rhodopsin and retinitis pigmentosa 2 interact with transportin1 (TNPO1) through previously identified CTSs. We further discovered that a new ternary complex, comprising TNPO1, Rab8 and a CTS, can assemble or disassemble under the guanine nucleotide exchange activity of Rab8. Our study suggests a new mechanism in which the TNPO1-Rab8-CTS complex mediates selective entry into and retention of cargos within cilia.

journal_name

J Cell Sci

journal_title

Journal of cell science

authors

Madugula V,Lu L

doi

10.1242/jcs.194019

subject

Has Abstract

pub_date

2016-10-15 00:00:00

pages

3922-3934

issue

20

eissn

0021-9533

issn

1477-9137

pii

jcs.194019

journal_volume

129

pub_type

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