Abstract
HERC1 is a very large protein involved in membrane traffic through both its ability to bind clathrin and its guanine nucleotide exchange factor (GEF) activity over ARF and Rab family GTPases. Herein, we show that HERC1 is recruited onto actin-rich surface protrusions in ARF6-transfected HeLa cells upon aluminum fluoride (AlF(4)(-)) treatment. Moreover, the fact that HERC1 overexpression does not stimulate protrusion formation in the absence of AlF(4)(-), in conditions where ARNO does, indicates that HERC1 is not acting as an ARF6-GEF in this system, but that instead its recruitment takes place downstream of ARF6 activation. Finally, we suggest a phosphoinositide-binding mechanism whereby HERC1 may translocate to these protrusions.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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ADP-Ribosylation Factor 6
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ADP-Ribosylation Factors / genetics
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ADP-Ribosylation Factors / physiology
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Actins / physiology*
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Aluminum Compounds / pharmacology
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Cell Surface Extensions* / drug effects
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Cytoskeleton
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Fluorides / pharmacology
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GTPase-Activating Proteins / physiology
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Guanine Nucleotide Exchange Factors / metabolism*
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Guanine Nucleotide Exchange Factors / physiology
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HeLa Cells
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Humans
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Phosphatidylinositols / metabolism
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Protein Binding
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Protein Transport
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Transfection
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Ubiquitin-Protein Ligases
Substances
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ADP-Ribosylation Factor 6
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Actins
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Aluminum Compounds
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GTPase-Activating Proteins
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Guanine Nucleotide Exchange Factors
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Phosphatidylinositols
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cytohesin-2
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HERC1 protein, human
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Ubiquitin-Protein Ligases
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ADP-Ribosylation Factors
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ARF6 protein, human
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Fluorides
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aluminum fluoride