Structure and DNA-bridging activity of the essential Rec114-Mei4 trimer interface.
Structure and DNA-bridging activity of the essential Rec114-Mei4 trimer interface.
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DOI:
10.1101/gad.350461.123
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发表时间:
2023-06-01
影响因子:
10.5
通讯作者:
Keeney, Scott
中科院分区:
文献类型:
--
作者:
Liu, Kaixian;Grasso, Emily M.;Pu, Stephen;Zou, Mengyang;Liu, Shixin;Eliezer, David;Keeney, Scott
In this study, Liu et al. describe the structural interactions between the C terminus of Rec114 and N terminus of Mei4 within the evolutionarily conserved, heterotrimeric DNA double-strand break complex during meiotic recombination. They further show that the minimal Rec114–Mei4 complex can bind coaligned duplex DNA to facilitate nucleoprotein nucleation and condensate formation. The DNA double-strand breaks (DSBs) that initiate meiotic recombination are formed by an evolutionarily conserved suite of factors that includes Rec114 and Mei4 (RM), which regulate DSB formation both spatially and temporally. In vivo, these proteins form large immunostaining foci that are integrated with higher-order chromosome structures. In vitro, they form a 2:1 heterotrimeric complex that binds cooperatively to DNA to form large, dynamic condensates. However, understanding of the atomic structures and dynamic DNA binding properties of RM complexes is lacking. Here, we report a structural model of a heterotrimeric complex of the C terminus of Rec114 with the N terminus of Mei4, supported by nuclear magnetic resonance experiments. This minimal complex, which lacks the predicted intrinsically disordered region of Rec114, is sufficient to bind DNA and form condensates. Single-molecule experiments reveal that the minimal complex can bridge two or more DNA duplexes and can generate force to condense DNA through long-range interactions. AlphaFold2 predicts similar structural models for RM orthologs across diverse taxa despite their low degree of sequence similarity. These findings provide insight into the conserved networks of protein–protein and protein–DNA interactions that enable condensate formation and promote formation of meiotic DSBs.
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