7AQD

Structure of the bacterial RQC complex (Translocating State)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Mimicry of Canonical Translation Elongation Underlies Alanine Tail Synthesis in RQC.

Filbeck, S.Cerullo, F.Paternoga, H.Tsaprailis, G.Joazeiro, C.A.P.Pfeffer, S.

(2021) Mol Cell 81: 104

  • DOI: 10.1016/j.molcel.2020.11.001
  • Primary Citation of Related Structures:  
    7AQC, 7AQD

  • PubMed Abstract: 
  • Aborted translation produces large ribosomal subunits obstructed with tRNA-linked nascent chains, which are substrates of ribosome-associated quality control (RQC). Bacterial RqcH, a widely conserved RQC factor, senses the obstruction and recruits tRNA Ala(UGC) to modify nascent-chain C termini with a polyalanine degron ...

    Aborted translation produces large ribosomal subunits obstructed with tRNA-linked nascent chains, which are substrates of ribosome-associated quality control (RQC). Bacterial RqcH, a widely conserved RQC factor, senses the obstruction and recruits tRNA Ala(UGC) to modify nascent-chain C termini with a polyalanine degron. However, how RqcH and its eukaryotic homologs (Rqc2 and NEMF), despite their relatively simple architecture, synthesize such C-terminal tails in the absence of a small ribosomal subunit and mRNA has remained unknown. Here, we present cryoelectron microscopy (cryo-EM) structures of Bacillus subtilis RQC complexes representing different Ala tail synthesis steps. The structures explain how tRNA Ala is selected via anticodon reading during recruitment to the A-site and uncover striking hinge-like movements in RqcH leading tRNA Ala into a hybrid A/P-state associated with peptidyl-transfer. Finally, we provide structural, biochemical, and molecular genetic evidence identifying the Hsp15 homolog (encoded by rqcP) as a novel RQC component that completes the cycle by stabilizing the P-site tRNA conformation. Ala tailing thus follows mechanistic principles surprisingly similar to canonical translation elongation.


    Organizational Affiliation

    Zentrum für Molekulare Biologie der Universität Heidelberg, DKFZ-ZMBH Alliance, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany. Electronic address: s.pfeffer@zmbh.uni-heidelberg.de.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Rqc2 homolog RqcHA [auth R]570Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rqcHyloABSU15640
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
50S ribosomal protein L2D [auth C]277Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rplBBSU01190
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
50S ribosomal protein L3E [auth D]209Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rplCBSU01160
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
50S ribosomal protein L4F [auth E]207Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rplDBSU01170
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
50S ribosomal protein L5G [auth F]179Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rplEBSU01280
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
50S ribosomal protein L6H [auth G]179Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rplFBSU01310
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Entity ID: 9
MoleculeChainsSequence LengthOrganismDetailsImage
50S ribosomal protein L11I141Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rplKrelCtsp6BSU01020
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Entity ID: 10
MoleculeChainsSequence LengthOrganismDetailsImage
50S ribosomal protein L13J145Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rplMBSU01490
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Entity ID: 11
MoleculeChainsSequence LengthOrganismDetailsImage
50S ribosomal protein L14K122Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rplNBSU01260
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Entity ID: 12
MoleculeChainsSequence LengthOrganismDetailsImage
50S ribosomal protein L15L146Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rplOBSU01350
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Entity ID: 13
MoleculeChainsSequence LengthOrganismDetailsImage
50S ribosomal protein L16M144Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rplPBSU01230
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Entity ID: 14
MoleculeChainsSequence LengthOrganismDetailsImage
50S ribosomal protein L17N120Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rplQBSU01440
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Entity ID: 15
MoleculeChainsSequence LengthOrganismDetailsImage
50S ribosomal protein L18O120Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rplRBSU01320
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Entity ID: 16
MoleculeChainsSequence LengthOrganismDetailsImage
50S ribosomal protein L20P [auth Q]119Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rplTBSU28850
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Entity ID: 17
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50S ribosomal protein L22Q [auth S]113Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rplVBSU01210
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Entity ID: 19
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50S ribosomal protein L24S [auth U]103Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rplXBSU01270
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Entity ID: 20
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50S ribosomal protein L27T [auth V]94Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rpmABSU27940
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Entity ID: 21
MoleculeChainsSequence LengthOrganismDetailsImage
nascent polyalanineU [auth W]7Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
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Entity ID: 22
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50S ribosomal protein L28V [auth X]62Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rpmByloTBSU15820
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Entity ID: 23
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50S ribosomal protein L30W [auth Z]59Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rpmDBSU01340
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Entity ID: 24
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50S ribosomal protein L19X [auth a]115Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rplSBSU16040
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Entity ID: 25
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50S ribosomal protein L32Y [auth b]59Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rpmFBSU15080
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Entity ID: 26
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50S ribosomal protein L33 1Z [auth c]49Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rpmGArpmG1BSU24900
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Entity ID: 27
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50S ribosomal protein L34AA [auth d]44Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rpmHBSU41060
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Entity ID: 28
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50S ribosomal protein L35BA [auth e]66Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rpmIBSU28860
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Entity ID: 29
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50S ribosomal protein L36CA [auth f]37Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rpmJBSU01400
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Entity ID: 30
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50S ribosomal protein L21DA [auth g]102Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rplUBSU27960
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Entity ID: 31
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50S ribosomal protein L23EA [auth h]95Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rplWBSU01180
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Entity ID: 32
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50S ribosomal protein L29FA [auth i]66Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: rpmCBSU01240
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Entity ID: 2
MoleculeChainsLengthOrganismImage
23S ribosomal RNAB [auth A]2918Bacillus subtilis subsp. subtilis str. 168
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Entity ID: 3
MoleculeChainsLengthOrganismImage
5S ribosomal RNAC [auth B]112Bacillus subtilis subsp. subtilis str. 168
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Entity ID: 18
MoleculeChainsLengthOrganismImage
Ala-tRNA (A/P-site)R [auth T]76Bacillus subtilis subsp. subtilis str. 168
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
German Research Foundation (DFG)GermanySFB1036
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United StatesR01 NS102414

Revision History  (Full details and data files)

  • Version 1.0: 2020-11-25
    Type: Initial release
  • Version 1.1: 2020-12-09
    Changes: Database references
  • Version 1.2: 2021-01-20
    Changes: Database references