Chimeric mitochondrial DNA polymerase gamma ternary complex (mAhB) in replication conformer
マップデータ
Main map
試料
複合体: Chimeric mitochondrial DNA polymerase gamma ternary complex (mAhB) in replication conformer
細胞器官・細胞要素: DNA polymerase subunit gamma-1
タンパク質・ペプチド: DNA polymerase subunit gamma-1
細胞器官・細胞要素: DNA polymerase subunit gamma-2
タンパク質・ペプチド: DNA polymerase subunit gamma-2
DNA: DNA (primer strand)
DNA: DNA (template strand)
リガンド: CALCIUM ION
リガンド: 2'-DEOXYCYTIDINE-5'-TRIPHOSPHATE
キーワード
Mitochondrial DNA polymerase / TRANSFERASE
機能・相同性
機能・相同性情報
gamma DNA polymerase complex / mitochondrial chromosome / Strand-asynchronous mitochondrial DNA replication / mitochondrial DNA replication / positive regulation of DNA-directed DNA polymerase activity / DNA replication proofreading / single-stranded DNA 3'-5' DNA exonuclease activity / DNA polymerase processivity factor activity / mitochondrial nucleoid / 5'-deoxyribose-5-phosphate lyase activity ...gamma DNA polymerase complex / mitochondrial chromosome / Strand-asynchronous mitochondrial DNA replication / mitochondrial DNA replication / positive regulation of DNA-directed DNA polymerase activity / DNA replication proofreading / single-stranded DNA 3'-5' DNA exonuclease activity / DNA polymerase processivity factor activity / mitochondrial nucleoid / 5'-deoxyribose-5-phosphate lyase activity / base-excision repair, gap-filling / DNA polymerase binding / Transcriptional activation of mitochondrial biogenesis / DNA-templated DNA replication / double-stranded DNA binding / protease binding / in utero embryonic development / DNA-directed DNA polymerase / DNA-directed DNA polymerase activity / mitochondrial matrix / chromatin binding / mitochondrion / DNA binding / identical protein binding / cytoplasm 類似検索 - 分子機能
DNA-directed DNA-polymerase, family A, mitochondria / DNA mitochondrial polymerase, exonuclease domain / POLG2, C-terminal / : / DNA mitochondrial polymerase exonuclease domain / Glycyl-tRNA synthetase/DNA polymerase subunit gamma-2 / Anticodon-binding / Anticodon binding domain / Anticodon-binding domain superfamily / DNA-directed DNA polymerase, family A, conserved site ...DNA-directed DNA-polymerase, family A, mitochondria / DNA mitochondrial polymerase, exonuclease domain / POLG2, C-terminal / : / DNA mitochondrial polymerase exonuclease domain / Glycyl-tRNA synthetase/DNA polymerase subunit gamma-2 / Anticodon-binding / Anticodon binding domain / Anticodon-binding domain superfamily / DNA-directed DNA polymerase, family A, conserved site / DNA polymerase family A signature. / DNA-directed DNA polymerase, family A, palm domain / DNA polymerase A domain / Class II Aminoacyl-tRNA synthetase/Biotinyl protein ligase (BPL) and lipoyl protein ligase (LPL) / Ribonuclease H-like superfamily / DNA/RNA polymerase superfamily 類似検索 - ドメイン・相同性
DNA polymerase subunit gamma-1 / DNA polymerase subunit gamma-2 類似検索 - 構成要素
ジャーナル: Nat Commun / 年: 2025 タイトル: Modelling POLG mutations in mice unravels a critical role of POLγΒ in regulating phenotypic severity. 著者: Samantha Corrà / Alessandro Zuppardo / Sebastian Valenzuela / Louise Jenninger / Raffaele Cerutti / Sirelin Sillamaa / Emily Hoberg / Katarina A S Johansson / Urska Rovsnik / Sara Volta / ...著者: Samantha Corrà / Alessandro Zuppardo / Sebastian Valenzuela / Louise Jenninger / Raffaele Cerutti / Sirelin Sillamaa / Emily Hoberg / Katarina A S Johansson / Urska Rovsnik / Sara Volta / Pedro Silva-Pinheiro / Hannah Davis / Aleksandra Trifunovic / Michal Minczuk / Claes M Gustafsson / Anu Suomalainen / Massimo Zeviani / Bertil Macao / Xuefeng Zhu / Maria Falkenberg / Carlo Viscomi / 要旨: DNA polymerase γ (POLγ), responsible for mitochondrial DNA replication, consists of a catalytic POLγA subunit and two accessory POLγB subunits. Mutations in POLG, which encodes POLγA, lead to ...DNA polymerase γ (POLγ), responsible for mitochondrial DNA replication, consists of a catalytic POLγA subunit and two accessory POLγB subunits. Mutations in POLG, which encodes POLγA, lead to various mitochondrial diseases. We investigated the most common POLG mutations (A467T, W748S, G848S, Y955C) by characterizing human and mouse POLγ variants. Our data reveal that these mutations significantly impair POLγ activities, with mouse variants exhibiting milder defects. Cryogenic electron microscopy highlighted structural differences between human and mouse POLγ, particularly in the POLγB subunit, which may explain the higher activity of mouse POLγ and the reduced severity of mutations in mice. We further generated a panel of mouse models mirroring common human POLG mutations, providing crucial insights into the pathogenesis of POLG-related disorders and establishing robust models for therapeutic development. Our findings emphasize the importance of POLγB in modulating the severity of POLG mutations.