- EMDB-35069: Cryo-EM structure of delta N15 MsDps2 of Mycobacterium smegmatis -
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基本情報
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データベース: EMDB / ID: EMD-35069
タイトル
Cryo-EM structure of delta N15 MsDps2 of Mycobacterium smegmatis
マップデータ
試料
複合体: Cryo-EM structure of delta N15 MsDps2 of Mycobacterium smegmatis
タンパク質・ペプチド: Starvation-inducible DNA-binding protein or fine tangled pili major subunit
キーワード
Cryo-EM / N15MsDps2 / DNA BINDING PROTEIN
機能・相同性
機能・相同性情報
oxidoreductase activity, acting on metal ions / ferric iron binding / DNA binding 類似検索 - 分子機能
Dps protein family signature 1. / DNA-binding protein Dps, conserved site / DNA-binding protein Dps / Ferritin/DPS protein domain / Ferritin-like domain / Ferritin-like / Ferritin-like superfamily 類似検索 - ドメイン・相同性
Starvation-inducible DNA-binding protein or fine tangled pili major subunit 類似検索 - 構成要素
ジャーナル: J Mol Biol / 年: 2024 タイトル: Cryo-EM Reveals the Mechanism of DNA Compaction by Mycobacterium smegmatis Dps2. 著者: Priyanka Garg / Thejas Satheesh / Mahipal Ganji / Somnath Dutta / 要旨: DNA binding protein from starved cells (Dps) is a miniature ferritin complex, which plays a vital role in protecting bacterial DNA during starvation to maintain the integrity of bacteria under ...DNA binding protein from starved cells (Dps) is a miniature ferritin complex, which plays a vital role in protecting bacterial DNA during starvation to maintain the integrity of bacteria under hostile conditions. Several approaches, including cryo-electron tomography, have been previously implemented by other research groups to decipher the structure of the Dps protein bound to DNA. However, none of the structures of the Dps-DNA complex was resolved to high resolution to identify the DNA binding residues. Like other bacteria, Mycobacterium smegmatis also expresses Dps2 (called MsDps2), which binds DNA to protect it under oxidative stress conditions. In this study, we implemented various biochemical and biophysical studies to characterize the DNA protein interactions of Dps2 protein from Mycobacterium smegmatis. We employed single-particle cryo-EM-based structural analysis of MsDps2-DNA complexes and identified that the region close to the N-terminus confers the DNA binding property. Based on cryo-EM data, we also pinpointed several arginine residues, proximal to the DNA binding region, responsible for DNA binding. We also performed mutations of these residues, which dramatically reduced the MsDps2-DNA interaction. In addition, we proposed a model that elucidates the mechanism of DNA compaction, which adapts a lattice-like structure. We performed single-molecule imaging of MsDps2-DNA interactions that corroborate well with our structural studies. Taken together, our results delineate the specific MsDps2 residues that play an important role in DNA binding and compaction, providing new insights into Mycobacterial DNA compaction mechanisms under stress conditions.