Abstract
DNA topoisomerase III beta (TOP3B) is unique by operating on both DNA and RNA substrates to regulate gene expression and genomic stability. Mutations in human TOP3B are linked to neurodevelopmental and cognitive disorders, highlighting its relevance for human health. Despite the emerging importance of TOP3B, its precise cellular functions and evolutionary history remain poorly understood. Here, we show that TOP3B is conserved across main metazoan groups and evolved under strong purifying selection. Subdomain IV was identified as the most conserved TOP3B region, in agreement with its role in providing the structural foundation of the protein. On the contrary, subdomain II is the less conserved, possibly because it is the most structurally flexible region of all TOP3B regions. Interestingly, TOP3B residue at position 472, previously associated with schizophrenia, is highly variable across animals, suggesting a more specific role in humans and related species. Finally, we show that all TOP3B CXXC zinc finger motifs previously identified at the protein C-terminal region are retained across metazoans. We also found that the two major methylation sites known to regulate TOP3B activity are located in the most conserved region of the C-terminal arginine-glycine-glycine (RGG) box, suggesting that a similar regulatory mechanism may operate throughout animals. Overall, our results provide a better understanding of the evolution and functional roles of TOP3B.
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Funding
This work was partially supported by a research grant to FM (SFRH/BD/131584/2017) from Fundação para a Ciência e a Tecnologia. MA was supported by a research grant (RYC-2015–18241) from the “Ministerio de Ciencia, Innovación y Universidades” of the Spanish Government.
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Moreira, F., Arenas, M., Videira, A. et al. Molecular Evolution of DNA Topoisomerase III Beta (TOP3B) in Metazoa. J Mol Evol 89, 384–395 (2021). https://doi.org/10.1007/s00239-021-10011-7
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DOI: https://doi.org/10.1007/s00239-021-10011-7