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The EMBO Journal
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The EMBO Journal
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The EMBO Journal
Article . 2012 . Peer-reviewed
Data sources: Crossref
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The EMBO Journal
Article . 2013
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The lipid kinase PI4KIIIβ preserves lysosomal identity

Authors: Sunandini Sridhar; Ana Maria Cuervo; Fernando Macian; Bindi Patel; David Aphkhazava; Dennis Shields; Laura Santambrogio;

The lipid kinase PI4KIIIβ preserves lysosomal identity

Abstract

Lipid modifications are essential in cellular sorting and trafficking inside cells. The role of phosphoinositides in trafficking between Golgi and endocytic/lysosomal compartments has been extensively explored and the kinases responsible for these lipid changes have been identified. In contrast, the mechanisms that mediate exit and recycling from lysosomes (Lys), considered for a long time as terminal compartments, are less understood. In this work, we identify a dynamic association of the lipid kinase PI4KIIIβ with Lys and unveil its regulatory function in lysosomal export and retrieval. We have found that absence of PI4KIIIβ leads to abnormal formation of tubular structures from the lysosomal surface and loss of lysosomal constituents through these tubules. We demonstrate that the kinase activity of PI4KIIIβ is necessary to prevent this unwanted lysosomal efflux under normal conditions, and to facilitate proper sorting when recycling of lysosomal material is needed, such as in the physiological context of lysosomal reformation after prolonged starvation.

Related Organizations
Keywords

Male, Lentivirus, Biological Transport, Lipid Metabolism, Immunohistochemistry, Mice, Inbred C57BL, Mice, Microscopy, Electron, HEK293 Cells, Microscopy, Fluorescence, Lysosomal-Associated Membrane Protein 1, Gene Knockdown Techniques, COS Cells, Chlorocebus aethiops, NIH 3T3 Cells, Animals, Humans, Protein Isoforms, Lysosomes, 1-Phosphatidylinositol 4-Kinase

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    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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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!
111
Top 1%
Top 10%
Top 10%
gold
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