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Molecular Biology of the Cell
Article . 2009 . Peer-reviewed
Data sources: Crossref
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MICAL-L1 Links EHD1 to Tubular Recycling Endosomes and Regulates Receptor Recycling

Authors: Mahak, Sharma; Sai Srinivas Panapakkam, Giridharan; Juliati, Rahajeng; Naava, Naslavsky; Steve, Caplan;

MICAL-L1 Links EHD1 to Tubular Recycling Endosomes and Regulates Receptor Recycling

Abstract

Endocytic recycling of receptors and lipids occurs via a complex network of tubular and vesicular membranes. EHD1 is a key regulator of endocytosis and associates with tubular membranes to facilitate recycling. Although EHD proteins tubulate membranes in vitro, EHD1 primarily associates with preexisting tubules in vivo. How EHD1 is recruited to these tubular endosomes remains unclear. We have determined that the Rab8-interacting protein, MICAL-L1, associates with EHD1, with both proteins colocalizing to long tubular membranes, in vitro and in live cells. MICAL-L1 is a largely uncharacterized member of the MICAL-family of proteins that uniquely contains two asparagine-proline-phenylalanine motifs, sequences that typically interact with EH-domains. Our data show that the MICAL-L1 C-terminal coiled-coil region is necessary and sufficient for its localization to tubular membranes. Moreover, we provide unexpected evidence that endogenous MICAL-L1 can link both EHD1 and Rab8a to these structures, as its depletion leads to loss of the EHD1-Rab8a interaction and the absence of both of these proteins from the membrane tubules. Finally, we demonstrate that MICAL-L1 is essential for efficient endocytic recycling. These data implicate MICAL-L1 as an unusual type of Rab effector that regulates endocytic recycling by recruiting and linking EHD1 and Rab8a on membrane tubules.

Related Organizations
Keywords

Integrin beta1, Amino Acid Motifs, Microfilament Proteins, Intracellular Signaling Peptides and Proteins, Vesicular Transport Proteins, Endosomes, Intracellular Membranes, LIM Domain Proteins, Models, Biological, Endocytosis, Mixed Function Oxygenases, Cytoskeletal Proteins, Protein Transport, rab GTP-Binding Proteins, Receptors, Transferrin, Humans, Adaptor Proteins, Signal Transducing, HeLa Cells, Protein Binding

  • BIP!
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    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).
    157
    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 1%
    influence
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    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 1%
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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!
157
Top 1%
Top 10%
Top 1%
bronze