Targeting of Arf-1 to the early Golgi by membrin, an ER-Golgi SNARE

Akira Honda, Omayma S. Al-Awar, Jesse C. Hay, Julie G. Donaldson

Research output: Contribution to journalArticlepeer-review

Abstract

Arf and Rab family GTPases regulate membrane traffic in cells, yet little is known about how they are targeted to distinct organelles. To identify sequences in Arf-1 necessary for Golgi targeting, we examined the localization of chimeras between Arf-1 and Arf-6. Here, we identify a 16-amino acid sequence in Arf-1 that specifies Golgi targeting and contains a motif (MXXE) that is important for Arf-1 binding to membrin, an ER-Golgi SNARE protein. The MXXE motif is conserved in all Arfs known to localize to the Golgi and enables Arf-1 to localize to the early Golgi. Arf-1 lacking these 16 aa can still localize to the late Golgi where it displays a more rapid Golgi-cytosol cycle than wild-type Arf-1. These studies suggest that membrin recruits Arf-1 to the early Golgi and reveal distinct kinetic cycles for Arf-1 at early and late Golgi determined by different sets of Arf regulators and effectors.

Original languageEnglish
Pages (from-to)1039-1051
Number of pages13
JournalJournal of Cell Biology
Volume168
Issue number7
DOIs
StatePublished - Mar 28 2005

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