- EMDB-38424: The cryo-EM structure of Orf2971-FtsHi motor complex -
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Basic information
Entry
Database: EMDB / ID: EMD-38424
Title
The cryo-EM structure of Orf2971-FtsHi motor complex
Map data
Sample
Complex: The complex of Orf2971-FtsHi motor
Protein or peptide: x 19 types
Ligand: x 6 types
Keywords
Chlamydomonas reinhardtii / protein transportation / chloroplast / lipid synthesis / Enzyme / PROTEIN TRANSPORT
Function / homology
Function and homology information
fatty acid transmembrane transporter activity / chloroplast inner membrane / phytochromobilin biosynthetic process / oxidoreductase activity, acting on the CH-CH group of donors, iron-sulfur protein as acceptor / poly(ADP-ribose) glycohydrolase / cobalt ion binding / ATP-dependent peptidase activity / chloroplast thylakoid membrane / acyl carrier activity / fatty acid transport ...fatty acid transmembrane transporter activity / chloroplast inner membrane / phytochromobilin biosynthetic process / oxidoreductase activity, acting on the CH-CH group of donors, iron-sulfur protein as acceptor / poly(ADP-ribose) glycohydrolase / cobalt ion binding / ATP-dependent peptidase activity / chloroplast thylakoid membrane / acyl carrier activity / fatty acid transport / chloroplast / metalloendopeptidase activity / protein transport / oxidoreductase activity / hydrolase activity / ATP hydrolysis activity / proteolysis / ATP binding / membrane Similarity search - Function
Tic22-like / Tic22-like family / Fatty acid desaturase / Acyl carrier protein, chloroplastic / Ferredoxin-dependent bilin reductase / Ferredoxin-dependent bilin reductase / ADP-ribosylation/Crystallin J1 / ADP-ribosylglycohydrolase / ADP-ribosylation/Crystallin J1 superfamily / : ...Tic22-like / Tic22-like family / Fatty acid desaturase / Acyl carrier protein, chloroplastic / Ferredoxin-dependent bilin reductase / Ferredoxin-dependent bilin reductase / ADP-ribosylation/Crystallin J1 / ADP-ribosylglycohydrolase / ADP-ribosylation/Crystallin J1 superfamily / : / Peptidase M41 / Peptidase M41-like / Peptidase family M41 / : / Acyl carrier protein (ACP) / AAA ATPase, AAA+ lid domain / AAA+ lid domain / ATPase, AAA-type, conserved site / AAA-protein family signature. / Phosphopantetheine attachment site / ACP-like superfamily / Carrier protein (CP) domain profile. / Phosphopantetheine binding ACP domain / 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 Similarity search - Domain/homology
Uncharacterized protein / Uncharacterized protein / Uncharacterized protein / 4Fe-4S ferredoxin-type domain-containing protein / Flagellar associated protein / AAA+ ATPase domain-containing protein / ADP-ribosylhydrolase ARH3 / Uncharacterized protein / Fatty acid desaturase domain-containing protein / Uncharacterized protein ...Uncharacterized protein / Uncharacterized protein / Uncharacterized protein / 4Fe-4S ferredoxin-type domain-containing protein / Flagellar associated protein / AAA+ ATPase domain-containing protein / ADP-ribosylhydrolase ARH3 / Uncharacterized protein / Fatty acid desaturase domain-containing protein / Uncharacterized protein / AAA+ ATPase domain-containing protein / Uncharacterized protein / Uncharacterized protein / Uncharacterized protein / Uncharacterized 341.7 kDa protein in psbD-psbC intergenic region / Acyl carrier protein Similarity search - Component
Biological species
Chlamydomonas reinhardtii (plant)
Method
single particle reconstruction / cryo EM / Resolution: 3.2 Å
National Natural Science Foundation of China (NSFC)
China
Citation
Journal: Mol Plant / Year: 2024 Title: Architecture of the ATP-driven motor for protein import into chloroplasts. Authors: Ning Wang / Jiale Xing / Xiaodong Su / Junting Pan / Hui Chen / Lifang Shi / Long Si / Wenqiang Yang / Mei Li / Abstract: Thousands of nuclear-encoded proteins are transported into chloroplasts through the TOC-TIC translocon that spans the chloroplast envelope membranes. A motor complex pulls the translocated proteins ...Thousands of nuclear-encoded proteins are transported into chloroplasts through the TOC-TIC translocon that spans the chloroplast envelope membranes. A motor complex pulls the translocated proteins out of the TOC-TIC complex into the chloroplast stroma by hydrolyzing ATP. The Orf2971-FtsHi complex has been suggested to serve as the ATP-hydrolyzing motor in Chlamydomonas reinhardtii, but little is known about its architecture and assembly. Here, we report the 3.2-Å resolution structure of the Chlamydomonas Orf2971-FtsHi complex. The 20-subunit complex spans the chloroplast inner envelope, with two bulky modules protruding into the intermembrane space and stromal matrix. Six subunits form a hetero-hexamer that potentially provides the pulling force through ATP hydrolysis. The remaining subunits, including potential enzymes/chaperones, likely facilitate the complex assembly and regulate its proper function. Taken together, our results provide the structural foundation for a mechanistic understanding of chloroplast protein translocation.
Model: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 400 / Support film - Material: CARBON / Support film - topology: CONTINUOUS / Support film - Film thickness: 2 / Pretreatment - Type: GLOW DISCHARGE
Vitrification
Cryogen name: ETHANE
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Electron microscopy
Microscope
TFS KRIOS
Image recording
Film or detector model: GATAN K2 QUANTUM (4k x 4k) / Detector mode: SUPER-RESOLUTION / Average electron dose: 50.0 e/Å2
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
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