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Baechtold, H; Kuroda, M; Sok, J; Ron, D; Lopez, B S; Akhmedov, A T
The Journal of biological chemistry, 11/1999, Letnik: 274, Številka: 48Journal Article
Homologous recombination plays a fundamental role in DNA double-strand break repair. Previously, we detected two mammalian nuclear proteins of 100 and 75 kDa (POMp100 and POMp75, respectively) that are able to promote homologous DNA pairing, a key step in homologous recombination. Here we describe the identification of human (h) POMp75 as the pro-oncoprotein TLS/FUS. hPOMp75/TLS binds both single- and double-stranded DNAs and mediates annealing of complementary DNA strands. More important, it promotes the uptake of a single-stranded oligonucleotide into a homologous superhelical DNA to form a D-loop. The formation of a D-loop is an essential step in DNA double-strand break repair through recombination. DNA annealing and D-loop formation catalyzed by hPOMp75/TLS require Mg 2+ and are ATP-independent. Interestingly, the oncogenic fusion form TLS-CHOP is not able to promote DNA pairing. These data suggest a possible role for hPOMp75/TLS in maintenance of genomic integrity.
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in: SICRIS
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