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Journal of Cell Science
Article . 2013 . Peer-reviewed
Data sources: Crossref
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Arf activation at the Golgi is modulated by feed-forward stimulation of the exchange factor GBF1

Authors: Paul Melançon; Dan Cassel; Fraser Gray; Douglas Quilty; Nathan Summerfeldt;

Arf activation at the Golgi is modulated by feed-forward stimulation of the exchange factor GBF1

Abstract

ADP-ribosylation factors (Arfs) play central roles in the regulation of vesicular trafficking through the Golgi. Arfs are activated at the Golgi membrane by guanine nucleotide exchange factors (GEFs) that are recruited from cytosol. Here, we describe a novel mechanism for regulation of recruitment and activity of the ArfGEF Golgi-specific BFA resistance factor 1 (GBF1). Conditions that alter the cellular Arf•GDP/Arf•GTP ratio result in GBF1 recruitment. This recruitment of GBF1 occurs selectively on cis-Golgi membranes in direct response to increased Arf•GDP. GBF1 recruitment requires Arf•GDP myristoylation-dependent interactions suggesting regulation of a membrane bound factor. Once recruited, GBF1 causes increased Arf•GTP production at the Golgi, consistent with a feed-forward, self-limiting mechanism of Arf activation. This mechanism is proposed to maintain steady-state levels of Arf•GTP at the cis-Golgi during cycles of Arf-dependent trafficking events.

Keywords

Feedback, Physiological, ADP-Ribosylation Factors, Cell Polarity, Golgi Apparatus, Intracellular Membranes, Guanosine Diphosphate, Models, Biological, Phosphatidylinositol Phosphates, Biocatalysis, Guanine Nucleotide Exchange Factors, Humans, Protein Isoforms, Guanosine Triphosphate, HeLa Cells

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    citations
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    13
    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.
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Powered by OpenAIRE graph
citations
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).
BIP!Citations provided by BIP!
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.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
13
Average
Average
Average
bronze