Crumbs organizes the transport machinery by regulating apical levels of PI(4,5)P<sub>2</sub> in <i>Drosophila</i>.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 31697234.
- Also identified by DOI 10.7554/eLife.50900 and PMC identifier 6881148.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
An efficient vectorial intracellular transport machinery depends on a well-established apico-basal polarity and is a prerequisite for the function of secretory epithelia. Despite extensive knowledge on individual trafficking pathways, little is known about the mechanisms coordinating their temporal and spatial regulation. Here, we report that the polarity protein Crumbs is essential for apical plasma membrane phospholipid-homeostasis and efficient apical secretion. Through recruiting β<sub>Heavy</sub>-Spectrin and MyosinV to the apical membrane, Crumbs maintains the Rab6-, Rab11- and Rab30-dependent trafficking and regulates the lipid phosphatases Pten and Ocrl. Crumbs knock-down results in increased apical levels of PI(4,5)P<sub>2</sub> and formation of a novel, Moesin- and PI(4,5)P<sub>2</sub>-enriched apical membrane sac containing microvilli-like structures. Our results identify Crumbs as an essential hub required to maintain the organization of the apical membrane and the physiological activity of the larval salivary gland.
Medical subject headings
- Drosophila Proteins
- Drosophila melanogaster
- Membrane Proteins
- Phosphatidylinositol 4,5-Diphosphate