- EMDB-5608: Structural dynamics and inter-ring communication of the MecA-ClpC... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-5608
タイトル
Structural dynamics and inter-ring communication of the MecA-ClpC protease complex during active substrate unfolding and translocation revealed by cryo-EM
マップデータ
Reconstruction of MecA-ClpC(E618A) with ATP, WM-ATP
試料
試料: MecA-ClpC(E618A)
タンパク質・ペプチド: MecA
タンパク質・ペプチド: ClpC
キーワード
unfolding / ATPase
機能・相同性
機能・相同性情報
negative regulation of establishment of competence for transformation / negative regulation of sporulation resulting in formation of a cellular spore / establishment of competence for transformation / sporulation resulting in formation of a cellular spore / protein-macromolecule adaptor activity / ATP hydrolysis activity / ATP binding 類似検索 - 分子機能
MecA, C-terminal domain superfamily / Negative regulator of genetic competence, MecA / Negative regulator of genetic competence (MecA) / UVR domain / UVR domain profile. / ClpA/B, conserved site 2 / Chaperonins clpA/B signature 2. / ClpA/B, conserved site 1 / Chaperonins clpA/B signature 1. / ClpA/ClpB, AAA lid domain ...MecA, C-terminal domain superfamily / Negative regulator of genetic competence, MecA / Negative regulator of genetic competence (MecA) / UVR domain / UVR domain profile. / ClpA/B, conserved site 2 / Chaperonins clpA/B signature 2. / ClpA/B, conserved site 1 / Chaperonins clpA/B signature 1. / ClpA/ClpB, AAA lid domain / AAA lid domain / Clp amino terminal domain, pathogenicity island component / : / Clp, repeat (R) domain / Clp repeat (R) domain profile. / Clp, N-terminal domain superfamily / ClpA/B family / Clp ATPase, C-terminal / AAA domain (Cdc48 subfamily) / C-terminal, D2-small domain, of ClpB protein / C-terminal, D2-small domain, of ClpB protein / ATPase family associated with various cellular activities (AAA) / ATPase, AAA-type, core / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase 類似検索 - ドメイン・相同性
Negative regulator of genetic competence ClpC/MecB / Adapter protein MecA 1 類似検索 - 構成要素
ジャーナル: J Biol Chem / 年: 2013 タイトル: Structural dynamics of the MecA-ClpC complex: a type II AAA+ protein unfolding machine. 著者: Jing Liu / Ziqing Mei / Ningning Li / Yutao Qi / Yanji Xu / Yigong Shi / Feng Wang / Jianlin Lei / Ning Gao / 要旨: The MecA-ClpC complex is a bacterial type II AAA(+) molecular machine responsible for regulated unfolding of substrates, such as transcription factors ComK and ComS, and targeting them to ClpP for ...The MecA-ClpC complex is a bacterial type II AAA(+) molecular machine responsible for regulated unfolding of substrates, such as transcription factors ComK and ComS, and targeting them to ClpP for degradation. The six subunits of the MecA-ClpC complex form a closed barrel-like structure, featured with three stacked rings and a hollow passage, where substrates are threaded and translocated through successive pores. Although the general concepts of how polypeptides are unfolded and translocated by internal pore loops of AAA(+) proteins have long been conceived, the detailed mechanistic model remains elusive. With cryoelectron microscopy, we captured four different structures of the MecA-ClpC complexes. These complexes differ in the nucleotide binding states of the two AAA(+) rings and therefore might presumably reflect distinctive, representative snapshots from a dynamic unfolding cycle of this hexameric complex. Structural analysis reveals that nucleotide binding and hydrolysis modulate the hexameric complex in a number of ways, including the opening of the N-terminal ring, the axial and radial positions of pore loops, the compactness of the C-terminal ring, as well as the relative rotation between the two nucleotide-binding domain rings. More importantly, our structural and biochemical data indicate there is an active allosteric communication between the two AAA(+) rings and suggest that concerted actions of the two AAA(+) rings are required for the efficiency of the substrate unfolding and translocation. These findings provide important mechanistic insights into the dynamic cycle of the MecA-ClpC unfoldase and especially lay a foundation toward the complete understanding of the structural dynamics of the general type II AAA(+) hexamers.
名称: MecA-ClpC(E618A) / タイプ: sample / ID: 1000 詳細: Mutant was generated by introducing Walker B mutations: E618A. The mutant ClpC can bind ATP but not be able to hydrolyze ATP.The protein complex was diluted with buffer, followed by an ...詳細: Mutant was generated by introducing Walker B mutations: E618A. The mutant ClpC can bind ATP but not be able to hydrolyze ATP.The protein complex was diluted with buffer, followed by an incubation in water bath at 300K for 40 minutes. 集合状態: Hexamer of ClpC with 6 bound MecA / Number unique components: 2
Protocol: Initial local fitting was done using Chimera and then MDFF was used for flexible fitting. ref: Trabuco, L.G., Villa, E., Mitra, K., Frank, J. and Schulten, K. (2008) Flexible fitting of atomic structures into electron microscopy maps using molecular dynamics.
精密化
空間: REAL / プロトコル: FLEXIBLE FIT / 当てはまり具合の基準: Cross-correlation
得られたモデル
PDB-3j3s: Structural dynamics of the MecA-ClpC complex revealed by cryo-EM