期刊
ACTA CRYSTALLOGRAPHICA SECTION F-STRUCTURAL BIOLOGY COMMUNICATIONS
卷 67, 期 -, 页码 1399-1402出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1744309111033549
关键词
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资金
- Canadian Institute for Health Research [MOP-89903]
- NSERC
XRCC4 and XLF are key proteins in the repair of DNA double-strand breaks through nonhomologous end-joining. Together, they form a complex that stimulates the ligation of double-strand breaks. Owing to the suggested filamentous nature of this complex, structural studies via X-ray crystallography have proven difficult. Multiple truncations of the XLF and XRCC4 proteins were cocrystallized, but yielded low-resolution diffraction (similar to 20 angstrom). However, a combination of microseeding, dehydration and heavy metals improved the diffraction of XRCC4(Delta 157)-XLF Delta 224 crystals to 3.9 angstrom resolution. Although molecular replacement alone was unable to produce a solution, when combined with the anomalous signal from tantalum bromide clusters initial phasing was successfully obtained.
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