A forward genetic screen identifies a negative regulator of rapid Ca 2+ -dependent cell egress (MS1) in the intracellular parasite Toxoplasma gondii
, like all apicomplexan parasites, uses Ca signaling pathways to activate gliding motility to power tissue dissemination and host cell invasion and egress. A group of "plant-like" Ca -dependent protein kinases (CDPKs) transduces cytosolic Ca flux into enzymatic activity, but how they funct...
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Published in | The Journal of biological chemistry Vol. 292; no. 18; p. 7662 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
05.05.2017
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Subjects | |
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Abstract | , like all apicomplexan parasites, uses Ca
signaling pathways to activate gliding motility to power tissue dissemination and host cell invasion and egress. A group of "plant-like" Ca
-dependent protein kinases (CDPKs) transduces cytosolic Ca
flux into enzymatic activity, but how they function is poorly understood. To investigate how Ca
signaling activates egress through CDPKs, we performed a forward genetic screen to isolate gain-of-function mutants from an egress-deficient
knockout strain. We recovered mutants that regained the ability to egress from host cells that harbored mutations in the gene
(SCE1). Global phosphoproteomic analysis showed that SCE1 deletion restored many Δ
-dependent phosphorylation events to near wild-type levels. We also show that CDPK3-dependent SCE1 phosphorylation is required to relieve its suppressive activity to potentiate egress. In summary, our work has uncovered a novel component and suppressor of Ca
-dependent cell egress during
lytic growth. |
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AbstractList | , like all apicomplexan parasites, uses Ca
signaling pathways to activate gliding motility to power tissue dissemination and host cell invasion and egress. A group of "plant-like" Ca
-dependent protein kinases (CDPKs) transduces cytosolic Ca
flux into enzymatic activity, but how they function is poorly understood. To investigate how Ca
signaling activates egress through CDPKs, we performed a forward genetic screen to isolate gain-of-function mutants from an egress-deficient
knockout strain. We recovered mutants that regained the ability to egress from host cells that harbored mutations in the gene
(SCE1). Global phosphoproteomic analysis showed that SCE1 deletion restored many Δ
-dependent phosphorylation events to near wild-type levels. We also show that CDPK3-dependent SCE1 phosphorylation is required to relieve its suppressive activity to potentiate egress. In summary, our work has uncovered a novel component and suppressor of Ca
-dependent cell egress during
lytic growth. |
Author | Scott, Nicollas E Papenfuss, Anthony T Schröder, Jan Foster, Leonard J Tonkin, Christopher J Uboldi, Alessandro D Li, Dongdi Lehane, Adele M McCoy, James M Stewart, Rebecca J |
Author_xml | – sequence: 1 givenname: James M surname: McCoy fullname: McCoy, James M organization: Computing and Information Systems,University of Melbourne, Victoria 3010, Australia – sequence: 2 givenname: Rebecca J surname: Stewart fullname: Stewart, Rebecca J organization: Computing and Information Systems,University of Melbourne, Victoria 3010, Australia – sequence: 3 givenname: Alessandro D surname: Uboldi fullname: Uboldi, Alessandro D organization: Computing and Information Systems,University of Melbourne, Victoria 3010, Australia – sequence: 4 givenname: Dongdi surname: Li fullname: Li, Dongdi organization: the Research School of Biology, Australian National University, Canberra, Australian Capital Territory 2601, Australia – sequence: 5 givenname: Jan surname: Schröder fullname: Schröder, Jan organization: the Peter MacCallum Cancer Institute, Victoria 3000, Australia, and – sequence: 6 givenname: Nicollas E surname: Scott fullname: Scott, Nicollas E organization: the University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada – sequence: 7 givenname: Anthony T surname: Papenfuss fullname: Papenfuss, Anthony T organization: the Peter MacCallum Cancer Institute, Victoria 3000, Australia, and – sequence: 8 givenname: Adele M surname: Lehane fullname: Lehane, Adele M organization: the Research School of Biology, Australian National University, Canberra, Australian Capital Territory 2601, Australia – sequence: 9 givenname: Leonard J surname: Foster fullname: Foster, Leonard J organization: the University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada – sequence: 10 givenname: Christopher J orcidid: 0000-0002-7036-6222 surname: Tonkin fullname: Tonkin, Christopher J email: tonkin@wehi.edu.au organization: the Departments of Medical Biology |
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Keywords | molecular genetics parasite Toxoplasma gondii signaling apicomplexa forward genetic screen proteomics Ca2+ signalling host cell egress |
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signaling pathways to activate gliding motility to power tissue dissemination and host cell invasion and egress. A... |
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SubjectTerms | Calcium Signaling - physiology Calcium-Binding Proteins - genetics Calcium-Binding Proteins - metabolism Phosphorylation - physiology Protein Kinases - genetics Protein Kinases - metabolism Protozoan Proteins - genetics Protozoan Proteins - metabolism Toxoplasma - genetics Toxoplasma - metabolism |
Title | A forward genetic screen identifies a negative regulator of rapid Ca 2+ -dependent cell egress (MS1) in the intracellular parasite Toxoplasma gondii |
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