National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)
米国
引用
ジャーナル: Mol Cell / 年: 2022 タイトル: Autophosphorylation transforms DNA-PK from protecting to processing DNA ends. 著者: Lan Liu / Xuemin Chen / Jun Li / Huaibin Wang / Christopher J Buehl / Noah J Goff / Katheryn Meek / Wei Yang / Martin Gellert / 要旨: The DNA-dependent protein kinase (DNA-PK) initially protects broken DNA ends but then promotes their processing during non-homologous end joining (NHEJ). Before ligation by NHEJ, DNA hairpin ends ...The DNA-dependent protein kinase (DNA-PK) initially protects broken DNA ends but then promotes their processing during non-homologous end joining (NHEJ). Before ligation by NHEJ, DNA hairpin ends generated during V(D)J recombination must be opened by the Artemis nuclease, together with autophosphorylated DNA-PK. Structures of DNA-PK bound to DNA before and after phosphorylation, and in complex with Artemis and a DNA hairpin, reveal an essential functional switch. When bound to open DNA ends in its protection mode, DNA-PK is inhibited for cis-autophosphorylation of the so-called ABCDE cluster but activated for phosphorylation of other targets. In contrast, DNA hairpin ends promote cis-autophosphorylation. Phosphorylation of four Thr residues in ABCDE leads to gross structural rearrangement of DNA-PK, widening the DNA binding groove for Artemis recruitment and hairpin cleavage. Meanwhile, Artemis locks DNA-PK into the kinase-inactive state. Kinase activity and autophosphorylation of DNA-PK are regulated by different DNA ends, feeding forward to coordinate NHEJ events.
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Data content type: Image / Data content type: Image / Provider: repository / タイプ: Initial release
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2022年1月12日
Data content type: Primary map / Data content type: Primary map / Provider: repository / タイプ: Initial release
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A: DNA-dependent protein kinase catalytic subunit B: X-ray repair cross-complementing protein 6 C: X-ray repair cross-complementing protein 5 D: DNA (5'-D(*GP*CP*AP*TP*GP*CP*TP*CP*TP*AP*CP*TP*GP*CP*TP*TP*CP*GP*AP*TP*AP*TP*CP*G)-3') E: DNA (5'-D(*AP*AP*GP*CP*AP*GP*TP*AP*GP*AP*G)-3') F: DNA (5'-D(*GP*CP*AP*TP*GP*CP*TP*CP*TP*AP*CP*TP*GP*CP*TP*TP*CP*GP*AP*TP*AP*TP*CP*G)-3') G: DNA (5'-D(*AP*AP*GP*CP*AP*GP*TP*AP*GP*AP*G)-3') ヘテロ分子