- EMDB-21559: Single particle cryoEM structure of V. cholerae Type IV competenc... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-21559
タイトル
Single particle cryoEM structure of V. cholerae Type IV competence pilus secretin PilQ
マップデータ
Type IV competence pilus secretin PilQ Relion PostProcess map (postprocess.mrc)
試料
複合体: Vibrio cholerae Type IV competence pilus secretin PilQ
タンパク質・ペプチド: Type IV pilus secretin PilQ family protein
キーワード
secretion system / outer membrane protein / TRANSPORT PROTEIN
機能・相同性
機能・相同性情報
protein secretion / cell outer membrane 類似検索 - 分子機能
Type IV pilus secretin PilQ / : / AMIN domain / AMIN domain / GspD/PilQ family / Secretin/TonB, short N-terminal domain / Secretin and TonB N terminus short domain / Bacterial type II secretion system protein D signature. / Type II secretion system protein GspD, conserved site / NolW-like ...Type IV pilus secretin PilQ / : / AMIN domain / AMIN domain / GspD/PilQ family / Secretin/TonB, short N-terminal domain / Secretin and TonB N terminus short domain / Bacterial type II secretion system protein D signature. / Type II secretion system protein GspD, conserved site / NolW-like / NolW-like superfamily / Bacterial type II/III secretion system short domain / Type II/III secretion system / Bacterial type II and III secretion system protein 類似検索 - ドメイン・相同性
Type IV pilus secretin PilQ family protein / Fimbrial assembly protein 類似検索 - 構成要素
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM128674
米国
引用
ジャーナル: Nat Commun / 年: 2020 タイトル: CryoEM structure of the type IVa pilus secretin required for natural competence in Vibrio cholerae. 著者: Sara J Weaver / Davi R Ortega / Matthew H Sazinsky / Triana N Dalia / Ankur B Dalia / Grant J Jensen / 要旨: Natural transformation is the process by which bacteria take up genetic material from their environment and integrate it into their genome by homologous recombination. It represents one mode of ...Natural transformation is the process by which bacteria take up genetic material from their environment and integrate it into their genome by homologous recombination. It represents one mode of horizontal gene transfer and contributes to the spread of traits like antibiotic resistance. In Vibrio cholerae, a type IVa pilus (T4aP) is thought to facilitate natural transformation by extending from the cell surface, binding to exogenous DNA, and retracting to thread this DNA through the outer membrane secretin, PilQ. Here, we use a functional tagged allele of VcPilQ purified from native V. cholerae cells to determine the cryoEM structure of the VcPilQ secretin in amphipol to ~2.7 Å. We use bioinformatics to examine the domain architecture and gene neighborhood of T4aP secretins in Proteobacteria in comparison with VcPilQ. This structure highlights differences in the architecture of the T4aP secretin from the type II and type III secretion system secretins. Based on our cryoEM structure, we design a series of mutants to reversibly regulate VcPilQ gate dynamics. These experiments support the idea of VcPilQ as a potential druggable target and provide insight into the channel that DNA likely traverses to promote the spread of antibiotic resistance via horizontal gene transfer by natural transformation.
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 293.15 K / 装置: FEI VITROBOT MARK IV / 詳細: blot force -6, blot time 4 s.
詳細
The protein was purified using Ni NTA agarose beads (Anatrace, SUPER-NINTA25) and concentrated to ~1 mg/mL. PilQ was then exchanged into Amphipol A8-35 (0.585 mg for a 3:1 ratio, Anatrace, A835). BioBeads were used to remove excess DDM and the sample was concentrated to ~0.8 mg/mL
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
特殊光学系
エネルギーフィルター - 名称: GIF Quantum LS / エネルギーフィルター - スリット幅: 20 eV
MotionCor2 was used for motion correction and dose weighting of 3,808 movies. CTF correction was used to evaluate micrograph quality. 2,510 micrographs were selected for particle picking.
粒子像選択
選択した数: 252319 詳細: CryoSPARC blob picking on 2,510 micrographs yielded 3,100,353 potential particles. After inspection in the cryoSPARC GUI, the 252,319 particles were extracted.
初期モデル
モデルのタイプ: OTHER / 詳細: cryoSPARC ab initio initial model generation