7AC7 image
Deposition Date 2020-09-10
Release Date 2021-08-18
Last Version Date 2025-12-17
Entry Detail
PDB ID:
7AC7
Keywords:
TRANSLATION
Title:
Structure of accomodated trans-translation complex on E. Coli stalled ribosome.
Biological Source:
Source Organism(s):
Escherichia coli (Taxon ID: 562)
Escherichia coli K-12 (Taxon ID: 83333)
Expression System(s):
Escherichia coli, Escherichia coli bl21(de3)
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
3.08 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
7AC7 validation report
Macromolecular Entities
Polymer Type:polyribonucleotide
Molecule:23S ribosomal RNA
Chain IDs:A (auth: 1)
Chain Length:2903
Number of Molecules:1
Biological Source:Escherichia coli K-12
Polymer Type:polyribonucleotide
Molecule:16S ribosomal RNA
Chain IDs:B (auth: 2)
Chain Length:1540
Number of Molecules:1
Biological Source:Escherichia coli K-12
Polymer Type:polyribonucleotide
Molecule:5S ribosomal RNA
Chain IDs:C (auth: 3)
Chain Length:120
Number of Molecules:1
Biological Source:Escherichia coli K-12
Polymer Type:polyribonucleotide
Molecule:transfer-messenger RNA (tmRNA)
Chain IDs:D (auth: 4)
Chain Length:363
Number of Molecules:1
Biological Source:Escherichia coli
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:SsrA-binding protein
Gene (Uniprot):smpB
Chain IDs:E (auth: 5)
Chain Length:147
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A832 Pfam ID:PF01668
Polymer Type:polyribonucleotide
Molecule:tRNA-Phe
Chain IDs:F (auth: 7)
Chain Length:76
Number of Molecules:1
Biological Source:Escherichia coli
Polymer Type:polyribonucleotide
Molecule:mRNA
Chain IDs:G (auth: 8)
Chain Length:15
Number of Molecules:1
Biological Source:Escherichia coli
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L27
Gene (Uniprot):rpmA
Chain IDs:H (auth: A)
Chain Length:84
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7L8 Pfam ID:PF01016
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L2
Gene (Uniprot):rplB
Chain IDs:I (auth: B)
Chain Length:271
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P60422 Pfam ID:PF03947, PF00181
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L3
Gene (Uniprot):rplC
Chain IDs:J (auth: C)
Chain Length:209
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P60438 Pfam ID:PF00297
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L4
Gene (Uniprot):rplD
Chain IDs:K (auth: D)
Chain Length:46
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P60723 Pfam ID:PF00573
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L5
Gene (Uniprot):rplE
Chain IDs:L (auth: E)
Chain Length:177
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P62399 Pfam ID:PF00281, PF00673
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L6
Gene (Uniprot):rplF
Chain IDs:M (auth: F)
Chain Length:175
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0AG55 Pfam ID:PF00347
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L9
Gene (Uniprot):rplI
Chain IDs:N (auth: G)
Chain Length:149
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7R1 Pfam ID:PF01281, PF03948
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L10
Gene (Uniprot):rplJ
Chain IDs:O (auth: H)
Chain Length:130
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7J3 Pfam ID:PF00466
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L13
Gene (Uniprot):rplM
Chain IDs:P (auth: J)
Chain Length:156
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0AA10 Pfam ID:PF00572
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L14
Gene (Uniprot):rplN
Chain IDs:Q (auth: K)
Chain Length:123
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0ADY3 Pfam ID:PF00238
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L15
Gene (Uniprot):rplO
Chain IDs:R (auth: L)
Chain Length:144
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P02413 Pfam ID:PF00828
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L16
Gene (Uniprot):rplP
Chain IDs:S (auth: M)
Chain Length:136
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0ADY7 Pfam ID:PF00252
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L17
Gene (Uniprot):rplQ
Chain IDs:T (auth: N)
Chain Length:119
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0AG44 Pfam ID:PF01196
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L18
Gene (Uniprot):rplR
Chain IDs:U (auth: O)
Chain Length:99
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0C018 Pfam ID:PF00861
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L19
Gene (Uniprot):rplS
Chain IDs:V (auth: P)
Chain Length:117
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7K6 Pfam ID:PF01245
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L20
Gene (Uniprot):rplT
Chain IDs:W (auth: Q)
Chain Length:123
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7L3 Pfam ID:PF00453
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L21
Gene (Uniprot):rplU
Chain IDs:X (auth: R)
Chain Length:115
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0AG48 Pfam ID:PF00829
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L22
Gene (Uniprot):rplV
Chain IDs:Y (auth: S)
Chain Length:100
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P61175 Pfam ID:PF00237
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L23
Gene (Uniprot):rplW
Chain IDs:Z (auth: T)
Chain Length:87
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0ADZ0 Pfam ID:PF00276
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L24
Gene (Uniprot):rplX
Chain IDs:AA (auth: U)
Chain Length:103
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P60624 Pfam ID:PF00467, PF17136
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L25
Gene (Uniprot):rplY
Chain IDs:BA (auth: V)
Chain Length:94
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P68919 Pfam ID:PF01386
Polymer Type:polypeptide(L)
Molecule:Nascent peptide
Chain IDs:CA (auth: W)
Chain Length:2
Number of Molecules:1
Biological Source:Escherichia coli K-12
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L28
Gene (Uniprot):rpmB
Chain IDs:DA (auth: X)
Chain Length:82
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7M2 Pfam ID:PF00830
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L29
Gene (Uniprot):rpmC
Chain IDs:EA (auth: Y)
Chain Length:58
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7M6 Pfam ID:PF00831
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L30
Gene (Uniprot):rpmD
Chain IDs:FA (auth: Z)
Chain Length:70
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0AG51 Pfam ID:PF00327
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L31
Gene (Uniprot):rpmE
Chain IDs:GA (auth: a)
Chain Length:84
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7M9 Pfam ID:PF01197
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L32
Gene (Uniprot):rpmF
Chain IDs:HA (auth: b)
Chain Length:271
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7N4 Pfam ID:PF01783
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L33
Gene (Uniprot):rpmG
Chain IDs:IA (auth: c)
Chain Length:209
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7N9 Pfam ID:PF00471
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L34
Gene (Uniprot):rpmH
Chain IDs:JA (auth: d)
Chain Length:46
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7P5 Pfam ID:PF00468
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L35
Gene (Uniprot):rpmI
Chain IDs:KA (auth: e)
Chain Length:177
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7Q1 Pfam ID:PF01632
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L36
Gene (Uniprot):rpmJ
Chain IDs:LA (auth: f)
Chain Length:175
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7Q6 Pfam ID:PF00444
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S2
Gene (Uniprot):rpsB
Chain IDs:MA (auth: g)
Chain Length:149
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7V0 Pfam ID:PF00318
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S3
Gene (Uniprot):rpsC
Chain IDs:NA (auth: h)
Chain Length:130
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7V3 Pfam ID:PF07650, PF00189
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S4
Gene (Uniprot):rpsD
Chain IDs:OA (auth: i)
Chain Length:205
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7V8 Pfam ID:PF00163, PF01479
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S5
Gene (Uniprot):rpsE
Chain IDs:PA (auth: j)
Chain Length:156
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7W1 Pfam ID:PF00333, PF03719
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S6
Gene (Uniprot):rpsF
Chain IDs:QA (auth: k)
Chain Length:123
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P02358 Pfam ID:PF01250
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S7
Gene (Uniprot):rpsG
Chain IDs:RA (auth: l)
Chain Length:144
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P02359 Pfam ID:PF00177
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S8
Gene (Uniprot):rpsH
Chain IDs:SA (auth: m)
Chain Length:136
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7W7 Pfam ID:PF00410
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S9
Gene (Uniprot):rpsI
Chain IDs:TA (auth: n)
Chain Length:119
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7X3 Pfam ID:PF00380
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S10
Gene (Uniprot):rpsJ
Chain IDs:UA (auth: o)
Chain Length:99
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7R5 Pfam ID:PF00338
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S11
Gene (Uniprot):rpsK
Chain IDs:VA (auth: p)
Chain Length:117
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7R9 Pfam ID:PF00411
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S12
Gene (Uniprot):rpsL
Chain IDs:WA (auth: q)
Chain Length:123
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7S3 Pfam ID:PF00164
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S13
Gene (Uniprot):rpsM
Chain IDs:XA (auth: r)
Chain Length:115
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7S9 Pfam ID:PF00416
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S14
Gene (Uniprot):rpsN
Chain IDs:YA (auth: s)
Chain Length:100
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0AG59 Pfam ID:PF00253
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S15
Gene (Uniprot):rpsO
Chain IDs:ZA (auth: t)
Chain Length:87
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0ADZ4 Pfam ID:PF00312
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S16
Gene (Uniprot):rpsP
Chain IDs:AB (auth: u)
Chain Length:103
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7T3 Pfam ID:PF00886
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S17
Gene (Uniprot):rpsQ
Chain IDs:BB (auth: v)
Chain Length:94
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0AG63 Pfam ID:PF00366
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S18
Gene (Uniprot):rpsR
Chain IDs:CB (auth: w)
Chain Length:2
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7T7 Pfam ID:PF01084
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S19
Gene (Uniprot):rpsS
Chain IDs:DB (auth: x)
Chain Length:82
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7U3 Pfam ID:PF00203
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S20
Gene (Uniprot):rpsT
Chain IDs:EB (auth: y)
Chain Length:58
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P0A7U7 Pfam ID:PF01649
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S21
Gene (Uniprot):rpsU
Chain IDs:FB (auth: z)
Chain Length:70
Number of Molecules:1
Biological Source:Escherichia coli K-12
UniProt ID:P68679 Pfam ID:PF01165
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
0TD WA ASP modified residue
4D4 S ARG modified residue
Ligand Molecules
MG
ZN
Primary Citation
Structures of tmRNA and SmpB as they transit through the ribosome.
Nat Commun 12 4909 4909 (2021)
PMID: 34389707 DOI: 10.1038/s41467-021-24881-4

Abstact

In bacteria, trans-translation is the main rescue system, freeing ribosomes stalled on defective messenger RNAs. This mechanism is driven by small protein B (SmpB) and transfer-messenger RNA (tmRNA), a hybrid RNA known to have both a tRNA-like and an mRNA-like domain. Here we present four cryo-EM structures of the ribosome during trans-translation at resolutions from 3.0 to 3.4 Å. These include the high-resolution structure of the whole pre-accommodated state, as well as structures of the accommodated state, the translocated state, and a translocation intermediate. Together, they shed light on the movements of the tmRNA-SmpB complex in the ribosome, from its delivery by the elongation factor EF-Tu to its passage through the ribosomal A and P sites after the opening of the B1 bridges. Additionally, we describe the interactions between the tmRNA-SmpB complex and the ribosome. These explain why the process does not interfere with canonical translation.

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Protein

Chemical

Disease

Primary Citation of related structures
7AC7
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