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FTO is an N  6 -methyladenosine demethylase removing methyl groups from nucleic acids. Several studies indicate the creation of FTO complexes with other proteins. Here, we looked for regulatory proteins recognizing parts of the FTO dioxygenase region. In the Calmodulin (CaM) Target Database, we found the FTO C-domain potentially binding CaM, and we proved this finding experimentally. The interaction was Ca 2+ -dependent but independent on FTO phosphorylation. We found that FTO-CaM interaction essentially influences calcium-binding loops in CaM, indicating the presence of two peptide populations-exchanging as CaM alone and differently, suggesting that only one part of CaM interacts with FTO, and the other one reminds free. The modeling of FTO-CaM interaction showed its stable structure when the half of the CaM molecule saturated with Ca 2+ interacts with the FTO C-domain, whereas the other part is disconnected. The presented data indicate calmodulin as a new FTO interactor and support engagement of the FTO protein in calcium signaling pathways.

Calmodulin as Ca2+-Dependent Interactor of FTO Dioxygenase