Regulation of signaling at regions of cell-cell contact by endoplasmic reticulum-bound protein-tyrosine phosphatase 1B.
Protein-tyrosine phosphatase 1B (PTP1B) is a ubiquitously expressed PTP that is anchored to the endoplasmic reticulum (ER). PTP1B dephosphorylates activated receptor tyrosine kinases after endocytosis, as they transit past the ER. However, PTP1B also can access some plasma membrane (PM)-bound substr...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Public Library of Science (PLoS)
2012-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC3360045?pdf=render |
| _version_ | 1819046071389650944 |
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| author | Fawaz G Haj Ola Sabet Ali Kinkhabwala Sabine Wimmer-Kleikamp Vassilis Roukos Hong-Mei Han Markus Grabenbauer Martin Bierbaum Claude Antony Benjamin G Neel Philippe I Bastiaens |
| author_facet | Fawaz G Haj Ola Sabet Ali Kinkhabwala Sabine Wimmer-Kleikamp Vassilis Roukos Hong-Mei Han Markus Grabenbauer Martin Bierbaum Claude Antony Benjamin G Neel Philippe I Bastiaens |
| author_sort | Fawaz G Haj |
| collection | DOAJ |
| description | Protein-tyrosine phosphatase 1B (PTP1B) is a ubiquitously expressed PTP that is anchored to the endoplasmic reticulum (ER). PTP1B dephosphorylates activated receptor tyrosine kinases after endocytosis, as they transit past the ER. However, PTP1B also can access some plasma membrane (PM)-bound substrates at points of cell-cell contact. To explore how PTP1B interacts with such substrates, we utilized quantitative cellular imaging approaches and mathematical modeling of protein mobility. We find that the ER network comes in close proximity to the PM at apparently specialized regions of cell-cell contact, enabling PTP1B to engage substrate(s) at these sites. Studies using PTP1B mutants show that the ER anchor plays an important role in restricting its interactions with PM substrates mainly to regions of cell-cell contact. In addition, treatment with PTP1B inhibitor leads to increased tyrosine phosphorylation of EphA2, a PTP1B substrate, specifically at regions of cell-cell contact. Collectively, our results identify PM-proximal sub-regions of the ER as important sites of cellular signaling regulation by PTP1B. |
| first_indexed | 2024-12-21T10:38:38Z |
| format | Article |
| id | doaj.art-2e25e6061dcc41f58a74720011ff8dc8 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-21T10:38:38Z |
| publishDate | 2012-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-2e25e6061dcc41f58a74720011ff8dc82022-12-21T19:06:59ZengPublic Library of Science (PLoS)PLoS ONE1932-62032012-01-0175e3663310.1371/journal.pone.0036633Regulation of signaling at regions of cell-cell contact by endoplasmic reticulum-bound protein-tyrosine phosphatase 1B.Fawaz G HajOla SabetAli KinkhabwalaSabine Wimmer-KleikampVassilis RoukosHong-Mei HanMarkus GrabenbauerMartin BierbaumClaude AntonyBenjamin G NeelPhilippe I BastiaensProtein-tyrosine phosphatase 1B (PTP1B) is a ubiquitously expressed PTP that is anchored to the endoplasmic reticulum (ER). PTP1B dephosphorylates activated receptor tyrosine kinases after endocytosis, as they transit past the ER. However, PTP1B also can access some plasma membrane (PM)-bound substrates at points of cell-cell contact. To explore how PTP1B interacts with such substrates, we utilized quantitative cellular imaging approaches and mathematical modeling of protein mobility. We find that the ER network comes in close proximity to the PM at apparently specialized regions of cell-cell contact, enabling PTP1B to engage substrate(s) at these sites. Studies using PTP1B mutants show that the ER anchor plays an important role in restricting its interactions with PM substrates mainly to regions of cell-cell contact. In addition, treatment with PTP1B inhibitor leads to increased tyrosine phosphorylation of EphA2, a PTP1B substrate, specifically at regions of cell-cell contact. Collectively, our results identify PM-proximal sub-regions of the ER as important sites of cellular signaling regulation by PTP1B.http://europepmc.org/articles/PMC3360045?pdf=render |
| spellingShingle | Fawaz G Haj Ola Sabet Ali Kinkhabwala Sabine Wimmer-Kleikamp Vassilis Roukos Hong-Mei Han Markus Grabenbauer Martin Bierbaum Claude Antony Benjamin G Neel Philippe I Bastiaens Regulation of signaling at regions of cell-cell contact by endoplasmic reticulum-bound protein-tyrosine phosphatase 1B. PLoS ONE |
| title | Regulation of signaling at regions of cell-cell contact by endoplasmic reticulum-bound protein-tyrosine phosphatase 1B. |
| title_full | Regulation of signaling at regions of cell-cell contact by endoplasmic reticulum-bound protein-tyrosine phosphatase 1B. |
| title_fullStr | Regulation of signaling at regions of cell-cell contact by endoplasmic reticulum-bound protein-tyrosine phosphatase 1B. |
| title_full_unstemmed | Regulation of signaling at regions of cell-cell contact by endoplasmic reticulum-bound protein-tyrosine phosphatase 1B. |
| title_short | Regulation of signaling at regions of cell-cell contact by endoplasmic reticulum-bound protein-tyrosine phosphatase 1B. |
| title_sort | regulation of signaling at regions of cell cell contact by endoplasmic reticulum bound protein tyrosine phosphatase 1b |
| url | http://europepmc.org/articles/PMC3360045?pdf=render |
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