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A novel imaging method revealed phosphatidylinositol 3,5-bisphosphate-rich domains in the endosome/lysosome membrane

We developed a new method to observe distribution of phosphatidylinositol 3,5-bisphosphate [PtdIns(3,5)P(2)] using electron microscopy. In freeze-fracture replicas of quick-frozen samples, PtdIns(3,5)P(2) was labeled specifically using recombinant ATG18 tagged with glutathione S-transferase and 4×FL...

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Detalles Bibliográficos
Autores principales: Takatori, Sho, Fujimoto, Toyoshi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Taylor & Francis 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4857783/
https://www.ncbi.nlm.nih.gov/pubmed/27195064
http://dx.doi.org/10.1080/19420889.2016.1145319
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author Takatori, Sho
Fujimoto, Toyoshi
author_facet Takatori, Sho
Fujimoto, Toyoshi
author_sort Takatori, Sho
collection PubMed
description We developed a new method to observe distribution of phosphatidylinositol 3,5-bisphosphate [PtdIns(3,5)P(2)] using electron microscopy. In freeze-fracture replicas of quick-frozen samples, PtdIns(3,5)P(2) was labeled specifically using recombinant ATG18 tagged with glutathione S-transferase and 4×FLAG, which was mixed with an excess of recombinant PX domain to suppress binding of ATG18 to phosphatidylinositol 3-phosphate. Using this method, PtdIns(3,5)P(2) was found to be enriched in limited domains in the yeast vacuole and mammalian endosomes. In the yeast vacuole exposed to hyperosmolar stress, PtdIns(3,5)P(2) was distributed at a significantly higher density in the intramembrane particle (IMP)-deficient liquid-ordered domains than in the surrounding IMP-rich domains. In mammalian cells, PtdIns(3,5)P(2) was observed in endosomes of tubulo-vesicular morphology labeled for RAB5 or RAB7. Notably, distribution density of PtdIns(3,5)P(2) in the endosome was significantly higher in the vesicular portion than in the tubular portion. The nano-scale distribution of PtdIns(3,5)P(2) revealed in the present study is important to understand its functional roles in the vacuole and endosomes.
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spelling pubmed-48577832016-05-18 A novel imaging method revealed phosphatidylinositol 3,5-bisphosphate-rich domains in the endosome/lysosome membrane Takatori, Sho Fujimoto, Toyoshi Commun Integr Biol Article Addendum We developed a new method to observe distribution of phosphatidylinositol 3,5-bisphosphate [PtdIns(3,5)P(2)] using electron microscopy. In freeze-fracture replicas of quick-frozen samples, PtdIns(3,5)P(2) was labeled specifically using recombinant ATG18 tagged with glutathione S-transferase and 4×FLAG, which was mixed with an excess of recombinant PX domain to suppress binding of ATG18 to phosphatidylinositol 3-phosphate. Using this method, PtdIns(3,5)P(2) was found to be enriched in limited domains in the yeast vacuole and mammalian endosomes. In the yeast vacuole exposed to hyperosmolar stress, PtdIns(3,5)P(2) was distributed at a significantly higher density in the intramembrane particle (IMP)-deficient liquid-ordered domains than in the surrounding IMP-rich domains. In mammalian cells, PtdIns(3,5)P(2) was observed in endosomes of tubulo-vesicular morphology labeled for RAB5 or RAB7. Notably, distribution density of PtdIns(3,5)P(2) in the endosome was significantly higher in the vesicular portion than in the tubular portion. The nano-scale distribution of PtdIns(3,5)P(2) revealed in the present study is important to understand its functional roles in the vacuole and endosomes. Taylor & Francis 2016-02-22 /pmc/articles/PMC4857783/ /pubmed/27195064 http://dx.doi.org/10.1080/19420889.2016.1145319 Text en © 2016 The Author(s). Published with license by Taylor & Francis Group, LLC http://creativecommons.org/licenses/by-nc/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution-Non-Commercial License http://creativecommons.org/licenses/by-nc/3.0/, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. The moral rights of the named author(s) have been asserted.
spellingShingle Article Addendum
Takatori, Sho
Fujimoto, Toyoshi
A novel imaging method revealed phosphatidylinositol 3,5-bisphosphate-rich domains in the endosome/lysosome membrane
title A novel imaging method revealed phosphatidylinositol 3,5-bisphosphate-rich domains in the endosome/lysosome membrane
title_full A novel imaging method revealed phosphatidylinositol 3,5-bisphosphate-rich domains in the endosome/lysosome membrane
title_fullStr A novel imaging method revealed phosphatidylinositol 3,5-bisphosphate-rich domains in the endosome/lysosome membrane
title_full_unstemmed A novel imaging method revealed phosphatidylinositol 3,5-bisphosphate-rich domains in the endosome/lysosome membrane
title_short A novel imaging method revealed phosphatidylinositol 3,5-bisphosphate-rich domains in the endosome/lysosome membrane
title_sort novel imaging method revealed phosphatidylinositol 3,5-bisphosphate-rich domains in the endosome/lysosome membrane
topic Article Addendum
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4857783/
https://www.ncbi.nlm.nih.gov/pubmed/27195064
http://dx.doi.org/10.1080/19420889.2016.1145319
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