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Original Article |
Correspondence to: Ken Sato, Molecular Membrane Biology Lab, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan. Tel:81-48-467-9548 Fax:81-48-462-4679 E-mail:satoken{at}postman.riken.go.jp.
Rer1p, a yeast Golgi membrane protein, is required for the retrieval of a set of endoplasmic reticulum (ER) membrane proteins. We present the first evidence that Rer1p directly interacts with the transmembrane domain (TMD) of Sec12p which contains a retrieval signal. A green fluorescent protein (GFP) fusion of Rer1p rapidly cycles between the Golgi and the ER. Either a lesion of coatomer or deletion of the COOH-terminal tail of Rer1p causes its mislocalization to the vacuole. The COOH-terminal Rer1p tail interacts in vitro with a coatomer complex containing
and
subunits. These findings not only give the proof that Rer1p is a novel type of retrieval receptor recognizing the TMD in the Golgi but also indicate that coatomer actively regulates the function and localization of Rer1p.
Key Words: retrieval, vesicle recycling, Golgi apparatus, coatomer, Saccharomyces cerevisiae
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