Tandem affinity purification of AtTERT reveals putative interaction partners of plant telomerase in vivo

0485642 - BFÚ 2018 AT eng J - Článek v odborném periodiku
Majerská, J. - Schrumpfová, P. - Dokládal, Ladislav - Schorová, Š. - Stejskal, K. - Obořil, M. - Honys, D. - Kozáková, L. - Polanská, P. - Sýkorová, Eva
Tandem affinity purification of AtTERT reveals putative interaction partners of plant telomerase in vivo.
Protoplasma. Roč. 254, č. 4 (2017), s. 1547-1562. ISSN 0033-183X. E-ISSN 1615-6102
Grant CEP: GA ČR GA13-06943S
Institucionální podpora: RVO:68081707
Klíčová slova: single-stranded-dna * genome-wide screen * arabidopsis-thaliana * reverse-transcriptase
Obor OECD: Genetics and heredity (medical genetics to be 3)
Impakt faktor: 2.457, rok: 2017

The life cycle of telomerase involves dynamic and complex interactions between proteins within multiple macromolecular networks. Elucidation of these associations is a key to understanding the regulation of telomerase under diverse physiological and pathological conditions from telomerase biogenesis, through telomere recruitment and elongation, to its non-canonical activities outside of telomeres. We used tandem affinity purification coupled to mass spectrometry to build an interactome of the telomerase catalytic subunit AtTERT, using Arabidopsis thaliana suspension cultures. We then examined interactions occurring at the AtTERT N-terminus, which is thought to fold into a discrete domain connected to the rest of the molecule via a flexible linker. Bioinformatic analyses revealed that interaction partners of AtTERT have a range of molecular functions, a subset of which is specific to the network around its N-terminus. A significant number of proteins co-purifying with the N-terminal constructs have been implicated in cell cycle and developmental processes, as would be expected of bona fide regulatory interactions and we have confirmed experimentally the direct nature of selected interactions. To examine AtTERT protein-protein interactions from another perspective, we also analysed AtTERT interdomain contacts to test potential dimerization of AtTERT. In total, our results provide an insight into the composition and architecture of the plant telomerase complex and this will aid in delineating molecular mechanisms of telomerase functions.
Trvalý link: http://hdl.handle.net/11104/0280611