期刊
GENES TO CELLS
卷 26, 期 4, 页码 219-229出版社
WILEY
DOI: 10.1111/gtc.12836
关键词
Drosophila telomere; HipHop; HOAP; MRN complex
资金
- Japan Society for the Promotion of Science (JSPS) Program for Advancing Strategic International Networks to Accelerate the Circulation of Talented Researchers [S2802]
Telomeres, essential DNA-protein structures in eukaryotes, are maintained by a capping protein complex that inhibits DNA damage response and contributes to genome integrity. In Drosophila, central factors HOAP and HipHop interact with the DDR protein complex MRN, which is crucial for telomere stability. Nbs interacts with Mre11 and transports Mre11-Rad50 complex to the nucleus, and also interacts with the N-terminal region of HOAP, essential for its co-localization with HipHop.
In eukaryotes, specific DNA-protein structures called telomeres exist at linear chromosome ends. Telomere stability is maintained by a specific capping protein complex. This capping complex is essential for the inhibition of the DNA damage response (DDR) at telomeres and contributes to genome integrity. In Drosophila, the central factors of telomere capping complex are HOAP and HipHop. Furthermore, a DDR protein complex Mre11-Rad50-Nbs (MRN) is known to be important for the telomere association of HOAP and HipHop. However, whether MRN interacts with HOAP and HipHop, and the telomere recognition mechanisms of HOAP and HipHop are poorly understood. Here, we show that Nbs interacts with Mre11 and transports the Mre11-Rad50 complex from the cytoplasm to the nucleus. In addition, we report that HOAP interacts with both Mre11 and Nbs. The N-terminal region of HOAP is essential for its co-localization with HipHop. Finally, we reveal that Nbs interacts with the N-terminal region of HOAP.
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