Disassembly activity of actin-depolymerizing factor (ADF) is associated with distinct cellular processes in apicomplexan parasites
Proteins of the actin-depolymerizing factor (ADF)/cofilin family have been shown to be crucial for the motility and survival of apicomplexan parasites. However, the mechanisms by which ADF proteins fulfill their function remain poorly understood. In this study, we investigate the comparative activit...
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Published in | Molecular biology of the cell Vol. 26; no. 17; pp. 3001 - 3012 |
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Main Authors | , , , , , , , , , , |
Format | Journal Article |
Language | English |
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United States
The American Society for Cell Biology
01.09.2015
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Abstract | Proteins of the actin-depolymerizing factor (ADF)/cofilin family have been shown to be crucial for the motility and survival of apicomplexan parasites. However, the mechanisms by which ADF proteins fulfill their function remain poorly understood. In this study, we investigate the comparative activities of ADF proteins from Toxoplasma gondii and Plasmodium falciparum, the human malaria parasite, using a conditional T. gondii ADF-knockout line complemented with ADF variants from either species. We show that P. falciparum ADF1 can fully restore native TgADF activity, demonstrating functional conservation between parasites. Strikingly, mutation of a key basic residue (Lys-72), previously implicated in disassembly in PfADF1, had no detectable phenotypic effect on parasite growth, motility, or development. In contrast, organelle segregation was severely impaired when complementing with a TgADF mutant lacking the corresponding residue (Lys-68). Biochemical analyses of each ADF protein confirmed the reduced ability of lysine mutants to mediate actin depolymerization via filament disassembly although not severing, in contrast to previous reports. These data suggest that actin filament disassembly is essential for apicomplexan parasite development but not for motility, as well as pointing to genus-specific coevolution between ADF proteins and their native actin. |
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AbstractList | Proteins of the actin-depolymerizing factor (ADF)/cofilin family have been shown to be crucial for the motility and survival of apicomplexan parasites. However, the mechanisms by which ADF proteins fulfill their function remain poorly understood. In this study, we investigate the comparative activities of ADF proteins from Toxoplasma gondii and Plasmodium falciparum, the human malaria parasite, using a conditional T. gondii ADF-knockout line complemented with ADF variants from either species. We show that P. falciparum ADF1 can fully restore native TgADF activity, demonstrating functional conservation between parasites. Strikingly, mutation of a key basic residue (Lys-72), previously implicated in disassembly in PfADF1, had no detectable phenotypic effect on parasite growth, motility, or development. In contrast, organelle segregation was severely impaired when complementing with a TgADF mutant lacking the corresponding residue (Lys-68). Biochemical analyses of each ADF protein confirmed the reduced ability of lysine mutants to mediate actin depolymerization via filament disassembly although not severing, in contrast to previous reports. These data suggest that actin filament disassembly is essential for apicomplexan parasite development but not for motility, as well as pointing to genus-specific coevolution between ADF proteins and their native actin. Complementation of a conditional KO of actin-depolymerizing factor (ADF) in Toxoplasma gondii demonstrates that ADF-dependent actin filament disassembly is essential for parasite development but not for cell motility. Furthermore, trans-genera complementation highlights genus-specific coevolution between ADF proteins and their native actins. Proteins of the actin-depolymerizing factor (ADF)/cofilin family have been shown to be crucial for the motility and survival of apicomplexan parasites. However, the mechanisms by which ADF proteins fulfill their function remain poorly understood. In this study, we investigate the comparative activities of ADF proteins from Toxoplasma gondii and Plasmodium falciparum , the human malaria parasite, using a conditional T. gondii ADF-knockout line complemented with ADF variants from either species. We show that P. falciparum ADF1 can fully restore native TgADF activity, demonstrating functional conservation between parasites. Strikingly, mutation of a key basic residue (Lys-72), previously implicated in disassembly in PfADF1, had no detectable phenotypic effect on parasite growth, motility, or development. In contrast, organelle segregation was severely impaired when complementing with a TgADF mutant lacking the corresponding residue (Lys-68). Biochemical analyses of each ADF protein confirmed the reduced ability of lysine mutants to mediate actin depolymerization via filament disassembly although not severing, in contrast to previous reports. These data suggest that actin filament disassembly is essential for apicomplexan parasite development but not for motility, as well as pointing to genus-specific coevolution between ADF proteins and their native actin. |
Author | Haase, Silvia Zimmermann, Dennis Tan, Yan Hong Kovar, David R Tonkin, Christopher J Baum, Jake Wong, Wilson Fisher, Fabio Wilkinson, Mark Olshina, Maya A Stewart, Rebecca J |
Author_xml | – sequence: 1 givenname: Silvia surname: Haase fullname: Haase, Silvia organization: Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia – sequence: 2 givenname: Dennis surname: Zimmermann fullname: Zimmermann, Dennis organization: Department of Molecular Genetics and Cell Biology, University of Chicago, Chicago, IL 60637 – sequence: 3 givenname: Maya A surname: Olshina fullname: Olshina, Maya A organization: Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia – sequence: 4 givenname: Mark surname: Wilkinson fullname: Wilkinson, Mark organization: Department of Life Sciences, Imperial College, London SW7 2AZ, United Kingdom – sequence: 5 givenname: Fabio surname: Fisher fullname: Fisher, Fabio organization: Department of Life Sciences, Imperial College, London SW7 2AZ, United Kingdom – sequence: 6 givenname: Yan Hong surname: Tan fullname: Tan, Yan Hong organization: Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia – sequence: 7 givenname: Rebecca J surname: Stewart fullname: Stewart, Rebecca J organization: Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia – sequence: 8 givenname: Christopher J surname: Tonkin fullname: Tonkin, Christopher J organization: Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia – sequence: 9 givenname: Wilson surname: Wong fullname: Wong, Wilson organization: Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia – sequence: 10 givenname: David R surname: Kovar fullname: Kovar, David R organization: Department of Molecular Genetics and Cell Biology, University of Chicago, Chicago, IL 60637 – sequence: 11 givenname: Jake surname: Baum fullname: Baum, Jake email: jake.baum@imperial.ac.uk organization: Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia Department of Medical Biology, University of Melbourne, Parkville, VIC 3052, Australia Department of Life Sciences, Imperial College, London SW7 2AZ, United Kingdom jake.baum@imperial.ac.uk |
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Copyright | 2015 Haase, Zimmermann, et al. This article is distributed by The American Society for Cell Biology under license from the author(s). Two months after publication it is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0). 2015 Haase, Zimmermann, This article is distributed by The American Society for Cell Biology under license from the author(s). Two months after publication it is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License ( ). 2015 |
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Snippet | Proteins of the actin-depolymerizing factor (ADF)/cofilin family have been shown to be crucial for the motility and survival of apicomplexan parasites.... Complementation of a conditional KO of actin-depolymerizing factor (ADF) in Toxoplasma gondii demonstrates that ADF-dependent actin filament disassembly is... |
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SourceType | Open Access Repository Aggregation Database Index Database |
StartPage | 3001 |
SubjectTerms | Actin Cytoskeleton - metabolism Actins - metabolism Animals Cell Movement - physiology Cytoskeleton - metabolism Destrin - genetics Destrin - metabolism Gene Knockout Techniques Genetic Association Studies Lysine - metabolism Plasmodium falciparum - metabolism Toxoplasma - metabolism |
Title | Disassembly activity of actin-depolymerizing factor (ADF) is associated with distinct cellular processes in apicomplexan parasites |
URI | https://www.ncbi.nlm.nih.gov/pubmed/26157165 https://search.proquest.com/docview/1708162372 https://pubmed.ncbi.nlm.nih.gov/PMC4551315 |
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