Phosphorylation of mitochondrial telomere binding protein of Candida parapsilosis by camp-dependent protein kinase

Biochemical and Biophysical Research Communications
Lubomir Tomaska

Abstract

Mitochondrial telomere-binding protein (mtTBP) of Candida parapsilosis binds with high affinity to 5' single-stranded overhang of the linear mitochondrial DNA of this yeast (Tomáska, L'., Nosek, J., and Fukuhara, H. (1997) J. Biol. Chem. 272, 3049-3056). Here it is reported that mtTBP is phosphorylated by catalytic subunit of cAMP-dependent protein kinase in vitro. Phosphorylated mtTBP has dramatically reduced ability to bind telomeric oligonucleotide in the gel-mobility retardation assay without affecting the oligomerization of mtTBP in vitro. MtTBP is one of the few mitochondrial proteins and the first mitochondrial single-strand DNA binding proteins that was demonstrated to serve as a substrate for cAMP-dependent protein kinase.

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