
The small GTPase Arf1p is involved in different cellular processes that require its accumulation at specific cellular locations. The recruitment of Arf1p to distinct points of action might be achieved by association of Arf1p with different proteins. To identify new interactors of Arf1p, we performed an affinity chromatography with GTP- or GDP-bound Arf1p proteins. A new interactor of Arf1p-GTP was identified as Pab1p, which binds to the polyA-tail of mRNAs. Pab1p was found to associate with purified COPI-coated vesicles generated from Golgi membranes in vitro. The stability of the Pab1p–Arf1p complex depends on the presence of mRNA. Both symmetrically distributed mRNAs as well as the asymmetrically localized ASH1 mRNA are found in association with Arf1p. Remarkably, Arf1p and Pab1p are both required to restrict ASH1 mRNA to the bud tip. Arf1p and coatomer play an unexpected role in localizing mRNA independent and downstream of the SHE machinery. Hereby acts the SHE machinery in long-range mRNA transport, whereas COPI vesicles could act as short-range and localization vehicles. The endoplasmic reticulum (ER)–Golgi shuttle might be involved in concentrating mRNA at the ER.
Ploidies, Genotype, Reverse Transcriptase Polymerase Chain Reaction, Golgi Apparatus, Biological Transport, Blotting, Northern, Endoplasmic Reticulum, Models, Biological, Poly(A)-Binding Proteins, Actins, Chromatography, Affinity, Coat Protein Complex I, Protein Biosynthesis, Mutation, Escherichia coli, ADP-Ribosylation Factor 1, RNA, Messenger, Poly A, Cytoskeleton, Protein Binding
Ploidies, Genotype, Reverse Transcriptase Polymerase Chain Reaction, Golgi Apparatus, Biological Transport, Blotting, Northern, Endoplasmic Reticulum, Models, Biological, Poly(A)-Binding Proteins, Actins, Chromatography, Affinity, Coat Protein Complex I, Protein Biosynthesis, Mutation, Escherichia coli, ADP-Ribosylation Factor 1, RNA, Messenger, Poly A, Cytoskeleton, Protein Binding
| selected citations These citations are derived from selected sources. This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 47 | |
| popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Top 10% | |
| influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Top 10% | |
| impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Top 10% |
