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

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Publikace nespadá pod Pedagogickou fakultu, ale pod Středoevropský technologický institut. Oficiální stránka publikace je na webu muni.cz.
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MAJERSKÁ Jana PROCHÁZKOVÁ SCHRUMPFOVÁ Petra DOKLADAL Ladislav SCHOŘOVÁ Šárka STEJSKAL Karel OBOŘIL Michal HONYS David KOZÁKOVÁ Lucie SOVÁKOVÁ Pavla SYKOROVA Eva

Rok publikování 2017
Druh Článek v odborném periodiku
Časopis / Zdroj Protoplasma
Fakulta / Pracoviště MU

Středoevropský technologický institut

Citace
www https://link.springer.com/article/10.1007%2Fs00709-016-1042-3
Doi http://dx.doi.org/10.1007/s00709-016-1042-3
Obor Genetika a molekulární biologie
Klíčová slova Telomerase; TAP-MS; AtPOT1a; Pontin; Reptin; PUR alpha 1
Popis 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.
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