Journal
JOURNAL OF CELL SCIENCE
Volume 122, Issue 13, Pages 2218-2227Publisher
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jcs.043414
Keywords
Retrograde transport; Yip1A; Golgi complex; Endoplasmic reticulum
Categories
Funding
- Japan Society for the Promotion of Science [19657057]
- PRESTO from Japan Science and Technology Agency
- Young Scientists
- Grants-in-Aid for Scientific Research [19657057] Funding Source: KAKEN
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Yip1A, a mammalian homologue of yeast Yip1p, is a multispanning membrane protein that is considered to be involved in transport between the endoplasmic reticulum (ER) and the Golgi. However, the precise role of Yip1A in mammalian cells remains unclear. We show here that endogenous Yip1A is localized to the ER-Golgi intermediate compartment (ERGIC). Knockdown of Yip1A by RNAi did not induce morphological changes in the Golgi, ER, or ERGIC. By analyzing a number of intracellular transport pathways, we found that Yip1A knockdown delayed the transport of Shiga toxin from the Golgi to the ER, but did not affect the anterograde transport of VSVGts045. We also found that a recombinant protein that corresponded to the N-terminal domain of Yip1A inhibited the COPI-independent retrograde transport of GFP-tagged galactosyltransferase, GT-GFP, but not the COPI-dependent retrograde transport of p58/ERGIC53. Furthermore, we found that Yip1A knockdown resulted in the dissociation of Rab6 from the membranes. These results suggested that Yip1A has a role in COPI-independent retrograde transport from the Golgi to the ER and regulates the membrane recruitment of Rab6.
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