Article ; Online: Stimulation of Variant Forms of the Mitochondrial DNA Helicase Twinkle by the Mitochondrial Single-Stranded DNA-Binding Protein.
Methods in molecular biology (Clifton, N.J.)
2021 Volume 2281, Page(s) 313–322
Abstract: Defects in mitochondrial DNA (mtDNA) maintenance may lead to disturbances in mitochondrial homeostasis and energy production in eukaryotic cells, causing diseases. During mtDNA replication, the mitochondrial single-stranded DNA-binding protein (mtSSB) ... ...
Abstract | Defects in mitochondrial DNA (mtDNA) maintenance may lead to disturbances in mitochondrial homeostasis and energy production in eukaryotic cells, causing diseases. During mtDNA replication, the mitochondrial single-stranded DNA-binding protein (mtSSB) stabilizes and protects the exposed single-stranded mtDNA from nucleolysis; perhaps more importantly, it appears to coordinate the actions of both the replicative mtDNA helicase Twinkle and DNA polymerase gamma at the replication fork. Here, we describe a helicase stimulation protocol to test in vitro the functional interaction between mtSSB and variant forms of Twinkle. We show for the first time that the C-terminal tail of Twinkle is important for such an interaction, and that it negatively regulates helicase unwinding activity in a salt-dependent manner. |
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MeSH term(s) | Binding Sites ; DNA Helicases/chemistry ; DNA Helicases/genetics ; DNA Helicases/metabolism ; DNA Replication ; DNA, Mitochondrial/chemistry ; DNA, Mitochondrial/metabolism ; DNA, Single-Stranded/chemistry ; DNA, Single-Stranded/metabolism ; DNA-Binding Proteins/chemistry ; DNA-Binding Proteins/metabolism ; Humans ; Mitochondrial Proteins/chemistry ; Mitochondrial Proteins/genetics ; Mitochondrial Proteins/metabolism ; Models, Molecular ; Mutation ; Protein Binding ; Protein Conformation |
Chemical Substances | DNA, Mitochondrial ; DNA, Single-Stranded ; DNA-Binding Proteins ; Mitochondrial Proteins ; SSBP1 protein, human ; DNA Helicases (EC 3.6.4.-) ; TWNK protein, human (EC 3.6.4.12) |
Language | English |
Publishing date | 2021-04-13 |
Publishing country | United States |
Document type | Journal Article ; Research Support, Non-U.S. Gov't |
ISSN | 1940-6029 |
ISSN (online) | 1940-6029 |
DOI | 10.1007/978-1-0716-1290-3_20 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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