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- EMDB-12916: E.coli delta rbfA pre-30S ribosomal subunit class D -

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Basic information

Entry
Database: EMDB / ID: EMD-12916
TitleE.coli delta rbfA pre-30S ribosomal subunit class D
Map data
Sample
  • Complex: E. coli pre-30S delta rbfA ribosomal subunit
    • Protein or peptide: x 10 types
    • RNA: x 1 types
  • Ligand: x 1 types
Function / homology
Function and homology information


mRNA 5'-UTR binding / small ribosomal subunit / small ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / tRNA binding / cytoplasmic translation / rRNA binding / ribosome / structural constituent of ribosome / translation ...mRNA 5'-UTR binding / small ribosomal subunit / small ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / tRNA binding / cytoplasmic translation / rRNA binding / ribosome / structural constituent of ribosome / translation / cytoplasm / cytosol
Similarity search - Function
Ribosomal protein S16, conserved site / Ribosomal protein S16 signature. / Ribosomal protein S6, conserved site / Ribosomal protein S6 signature. / Ribosomal protein S11, bacterial-type / Ribosomal protein S20 / Ribosomal protein S20 superfamily / Ribosomal protein S20 / Ribosomal protein S4, bacterial-type / 30S ribosomal protein S17 ...Ribosomal protein S16, conserved site / Ribosomal protein S16 signature. / Ribosomal protein S6, conserved site / Ribosomal protein S6 signature. / Ribosomal protein S11, bacterial-type / Ribosomal protein S20 / Ribosomal protein S20 superfamily / Ribosomal protein S20 / Ribosomal protein S4, bacterial-type / 30S ribosomal protein S17 / Ribosomal protein S6, plastid/chloroplast / Ribosomal protein S18, conserved site / Ribosomal protein S18 signature. / Ribosomal protein S16 / Ribosomal protein S16 / Ribosomal protein S16 domain superfamily / Ribosomal protein S15, bacterial-type / Ribosomal protein S6 / Ribosomal protein S6 / Ribosomal protein S6 superfamily / Ribosomal protein S12, bacterial-type / Translation elongation factor EF1B/ribosomal protein S6 / Ribosomal protein S18 / Ribosomal protein S18 / Ribosomal protein S18 superfamily / Ribosomal protein S17, conserved site / Ribosomal protein S17 signature. / Ribosomal protein S4/S9 N-terminal domain / Ribosomal protein S8 signature. / Ribosomal protein S4/S9 N-terminal domain / Ribosomal protein S4/S9, N-terminal / Ribosomal protein S4, conserved site / Ribosomal protein S4 signature. / Ribosomal protein S15 signature. / Ribosomal protein S4/S9 / Ribosomal protein S8 / Ribosomal protein S8 superfamily / Ribosomal protein S8 / S4 RNA-binding domain profile. / Ribosomal S11, conserved site / Ribosomal protein S11 signature. / Ribosomal protein S11 / Ribosomal protein S11 / S4 RNA-binding domain / S4 domain / RNA-binding S4 domain / RNA-binding S4 domain superfamily / Ribosomal protein S12 signature. / Ribosomal protein S12/S23 / Ribosomal protein S12/S23 / Ribosomal protein S17/S11 / Ribosomal protein S17 / Ribosomal protein S15 / Ribosomal_S15 / Ribosomal protein S15 / Ribosomal protein S11 superfamily / S15/NS1, RNA-binding / Nucleic acid-binding, OB-fold
Similarity search - Domain/homology
30S ribosomal protein S17 / 30S ribosomal protein S15 / 30S ribosomal protein S12 / 30S ribosomal protein S20 / 30S ribosomal protein S11 / 30S ribosomal protein S18 / 30S ribosomal protein S4 / 30S ribosomal protein S16 / 30S ribosomal protein S8 / Small ribosomal subunit protein bS6
Similarity search - Component
Biological speciesEscherichia coli BW25113 (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.76 Å
AuthorsMaksimova E / Korepanov A / Baymukhametov T / Kravchenko O / Stolboushkina E
Funding support Russian Federation, 1 items
OrganizationGrant numberCountry
Russian Science Foundation19-74-20186 Russian Federation
CitationJournal: Int J Mol Sci / Year: 2021
Title: RbfA Is Involved in Two Important Stages of 30S Subunit Assembly: Formation of the Central Pseudoknot and Docking of Helix 44 to the Decoding Center.
Authors: Elena M Maksimova / Alexey P Korepanov / Olesya V Kravchenko / Timur N Baymukhametov / Alexander G Myasnikov / Konstantin S Vassilenko / Zhanna A Afonina / Elena A Stolboushkina /
Abstract: Ribosome biogenesis is a highly coordinated and complex process that requires numerous assembly factors that ensure prompt and flawless maturation of ribosomal subunits. Despite the increasing amount ...Ribosome biogenesis is a highly coordinated and complex process that requires numerous assembly factors that ensure prompt and flawless maturation of ribosomal subunits. Despite the increasing amount of data collected, the exact role of most assembly factors and mechanistic details of their operation remain unclear, mainly due to the shortage of high-resolution structural information. Here, using cryo-electron microscopy, we characterized 30S ribosomal particles isolated from an   strain with a deleted gene for the RbfA factor. The cryo-EM maps for pre-30S subunits were divided into six classes corresponding to consecutive assembly intermediates: from the particles with a completely unresolved head domain and unfolded central pseudoknot to almost mature 30S subunits with well-resolved body, platform, and head domains and partially distorted helix 44. The structures of two predominant 30S intermediates belonging to most populated classes obtained at 2.7 Å resolutions indicate that RbfA acts at two distinctive 30S assembly stages: early formation of the central pseudoknot including folding of the head, and positioning of helix 44 in the decoding center at a later stage. Additionally, it was shown that the formation of the central pseudoknot may promote stabilization of the head domain, likely through the RbfA-dependent maturation of the neck helix 28. An update to the model of factor-dependent 30S maturation is proposed, suggesting that RfbA is involved in most of the subunit assembly process.
History
DepositionMay 11, 2021-
Header (metadata) releaseJul 14, 2021-
Map releaseJul 14, 2021-
UpdateJul 14, 2021-
Current statusJul 14, 2021Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.218
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 0.218
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7oi0
  • Surface level: 0.218
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_12916.png

Downloads & links

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Map

FileDownload / File: emd_12916.map.gz / Format: CCP4 / Size: 325 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 0.86 Å
Density
Contour LevelBy AUTHOR: 0.218 / Movie #1: 0.218
Minimum - Maximum-2.6402922 - 5.610784
Average (Standard dev.)0.0066674086 (±0.08316907)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions440440440
Spacing440440440
CellA=B=C: 378.4 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.860.860.86
M x/y/z440440440
origin x/y/z0.0000.0000.000
length x/y/z378.400378.400378.400
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ256256256
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS440440440
D min/max/mean-2.6405.6110.007

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Supplemental data

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Half map: #2

Fileemd_12916_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_12916_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : E. coli pre-30S delta rbfA ribosomal subunit

EntireName: E. coli pre-30S delta rbfA ribosomal subunit
Components
  • Complex: E. coli pre-30S delta rbfA ribosomal subunit
    • Protein or peptide: 30S ribosomal protein S4
    • Protein or peptide: 30S ribosomal protein S6, fully modified isoform
    • Protein or peptide: 30S ribosomal protein S8
    • Protein or peptide: 30S ribosomal protein S11
    • Protein or peptide: 30S ribosomal protein S12
    • Protein or peptide: 30S ribosomal protein S15
    • Protein or peptide: 30S ribosomal protein S16
    • Protein or peptide: 30S ribosomal protein S17
    • Protein or peptide: 30S ribosomal protein S18
    • Protein or peptide: 30S ribosomal protein S20
    • RNA: 16S rRNA
  • Ligand: water

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Supramolecule #1: E. coli pre-30S delta rbfA ribosomal subunit

SupramoleculeName: E. coli pre-30S delta rbfA ribosomal subunit / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#11
Source (natural)Organism: Escherichia coli BW25113 (bacteria)
Molecular weightTheoretical: 850 KDa

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Macromolecule #1: 30S ribosomal protein S4

MacromoleculeName: 30S ribosomal protein S4 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli BW25113 (bacteria)
Molecular weightTheoretical: 23.383002 KDa
SequenceString: ARYLGPKLKL SRREGTDLFL KSGVRAIDTK CKIEQAPGQH GARKPRLSDY GVQLREKQKV RRIYGVLERQ FRNYYKEAAR LKGNTGENL LALLEGRLDN VVYRMGFGAT RAEARQLVSH KAIMVNGRVV NIASYQVSPN DVVSIREKAK KQSRVKAALE L AEQREKPT ...String:
ARYLGPKLKL SRREGTDLFL KSGVRAIDTK CKIEQAPGQH GARKPRLSDY GVQLREKQKV RRIYGVLERQ FRNYYKEAAR LKGNTGENL LALLEGRLDN VVYRMGFGAT RAEARQLVSH KAIMVNGRVV NIASYQVSPN DVVSIREKAK KQSRVKAALE L AEQREKPT WLEVDAGKME GTFKRKPERS DLSADINEHL IVELYSK

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Macromolecule #2: 30S ribosomal protein S6, fully modified isoform

MacromoleculeName: 30S ribosomal protein S6, fully modified isoform / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli BW25113 (bacteria)
Molecular weightTheoretical: 15.727512 KDa
SequenceString:
MRHYEIVFMV HPDQSEQVPG MIERYTAAIT GAEGKIHRLE DWGRRQLAYP INKLHKAHYV LMNVEAPQEV IDELETTFRF NDAVIRSMV MRTKHAVTEA SPMVKAKDER RERRDDFANE TADDAEAGDS EEEEEE

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Macromolecule #3: 30S ribosomal protein S8

MacromoleculeName: 30S ribosomal protein S8 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli BW25113 (bacteria)
Molecular weightTheoretical: 14.015361 KDa
SequenceString:
SMQDPIADML TRIRNGQAAN KAAVTMPSSK LKVAIANVLK EEGFIEDFKV EGDTKPELEL TLKYFQGKAV VESIQRVSRP GLRIYKRKD ELPKVMAGLG IAVVSTSKGV MTDRAARQAG LGGEIICYVA

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Macromolecule #4: 30S ribosomal protein S11

MacromoleculeName: 30S ribosomal protein S11 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli BW25113 (bacteria)
Molecular weightTheoretical: 13.739778 KDa
SequenceString:
AKAPIRARKR VRKQVSDGVA HIHASFNNTI VTITDRQGNA LGWATAGGSG FRGSRKSTPF AAQVAAERCA DAVKEYGIKN LEVMVKGPG PGRESTIRAL NAAGFRITNI TDVTPIPHNG CRPPKKRRV

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Macromolecule #5: 30S ribosomal protein S12

MacromoleculeName: 30S ribosomal protein S12 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli BW25113 (bacteria)
Molecular weightTheoretical: 13.636961 KDa
SequenceString:
ATVNQLVRKP RARKVAKSNV PALEACPQKR GVCTRVYTTT PKKPNSALRK VCRVRLTNGF EVTSYIGGEG HNLQEHSVIL IRGGRVKDL PGVRYHTVRG ALDCSGVKDR KQARSKYGVK RPKA

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Macromolecule #6: 30S ribosomal protein S15

MacromoleculeName: 30S ribosomal protein S15 / type: protein_or_peptide / ID: 6 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli BW25113 (bacteria)
Molecular weightTheoretical: 10.319882 KDa
SequenceString:
MSLSTEATAK IVSEFGRDAN DTGSTEVQVA LLTAQINHLQ GHFAEHKKDH HSRRGLLRMV SQRRKLLDYL KRKDVARYTR LIERLGLRR

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Macromolecule #7: 30S ribosomal protein S16

MacromoleculeName: 30S ribosomal protein S16 / type: protein_or_peptide / ID: 7 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli BW25113 (bacteria)
Molecular weightTheoretical: 9.207572 KDa
SequenceString:
MVTIRLARHG AKKRPFYQVV VADSRNARNG RFIERVGFFN PIASEKEEGT RLDLDRIAHW VGQGATISDR VAALIKEVNK AA

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Macromolecule #8: 30S ribosomal protein S17

MacromoleculeName: 30S ribosomal protein S17 / type: protein_or_peptide / ID: 8 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli BW25113 (bacteria)
Molecular weightTheoretical: 9.593296 KDa
SequenceString:
TDKIRTLQGR VVSDKMEKSI VVAIERFVKH PIYGKFIKRT TKLHVHDENN ECGIGDVVEI RECRPLSKTK SWTLVRVVEK AVL

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Macromolecule #9: 30S ribosomal protein S18

MacromoleculeName: 30S ribosomal protein S18 / type: protein_or_peptide / ID: 9 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli BW25113 (bacteria)
Molecular weightTheoretical: 8.874276 KDa
SequenceString:
ARYFRRRKFC RFTAEGVQEI DYKDIATLKN YITESGKIVP SRITGTRAKY QRQLARAIKR ARYLSLLPYT DRHQ

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Macromolecule #10: 30S ribosomal protein S20

MacromoleculeName: 30S ribosomal protein S20 / type: protein_or_peptide / ID: 10 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli BW25113 (bacteria)
Molecular weightTheoretical: 9.577268 KDa
SequenceString:
ANIKSAKKRA IQSEKARKHN ASRRSMMRTF IKKVYAAIEA GDKAAAQKAF NEMQPIVDRQ AAKGLIHKNK AARHKANLTA QINKLA

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Macromolecule #11: 16S rRNA

MacromoleculeName: 16S rRNA / type: rna / ID: 11 / Number of copies: 1
Source (natural)Organism: Escherichia coli BW25113 (bacteria)
Molecular weightTheoretical: 499.690031 KDa
SequenceString: AAAUUGAAGA GUUUGAUCAU GGCUCAGAUU GAACGCUGGC GGCAGGCCUA ACACAUGCAA GUCGAACGGU AACAGGAAGA AGCUUGCUU CUUUGCUGAC GAGUGGCGGA CGGGUGAGUA AUGUCUGGGA AACUGCCUGA UGGAGGGGGA UAACUACUGG A AACGGUAG ...String:
AAAUUGAAGA GUUUGAUCAU GGCUCAGAUU GAACGCUGGC GGCAGGCCUA ACACAUGCAA GUCGAACGGU AACAGGAAGA AGCUUGCUU CUUUGCUGAC GAGUGGCGGA CGGGUGAGUA AUGUCUGGGA AACUGCCUGA UGGAGGGGGA UAACUACUGG A AACGGUAG CUAAUACCGC AUAACGUCGC AAGACCAAAG AGGGGGACCU UCGGGCCUCU UGCCAUCGGA UGUGCCCAGA UG GGAUUAG CUAGUAGGUG GGGUAACGGC UCACCUAGGC GACGAUCCCU AGCUGGUCUG AGAGGAUGAC CAGCCACACU GGA ACUGAG ACACGGUCCA GACUCCUACG GGAGGCAGCA GUGGGGAAUA UUGCACAAUG GGCGCAAGCC UGAUGCAGCC AUGC CGCGU GUAUGAAGAA GGCCUUCGGG UUGUAAAGUA CUUUCAGCGG GGAGGAAGGG AGUAAAGUUA AUACCUUUGC UCAUU GACG UUACCCGCAG AAGAAGCACC GGCUAACUCC GUGCCAGCAG CCGCGGUAAU ACGGAGGGUG CAAGCGUUAA UCGGAA UUA CUGGGCGUAA AGCGCACGCA GGCGGUUUGU UAAGUCAGAU GUGAAAUCCC CGGGCUCAAC CUGGGAACUG CAUCUGA UA CUGGCAAGCU UGAGUCUCGU AGAGGGGGGU AGAAUUCCAG GUGUAGCGGU GAAAUGCGUA GAGAUCUGGA GGAAUACC G GUGGCGAAGG CGGCCCCCUG GACGAAGACU GACGCUCAGG UGCGAAAGCG UGGGGAGCAA ACAGGAUUAG AUACCCUGG UAGUCCACGC CGUAAACGAU GUCGACUUGG AGGUUGUGCC CUUGAGGCGU GGCUUCCGGA GCUAACGCGU UAAGUCGACC GCCUGGGGA GUACGGCCGC AAGGUUAAAA CUCAAAUGAA UUGACGGGGG CCCGCACAAG CGGUGGAGCA UGUGGUUUAA U UCGAUGCA ACGCGAAGAA CCUUACCUGG UCUUGACAUC CACGGAAGUU UUCAGAGAUG AGAAUGUGCC UUCGGGAACC GU GAGACAG GUGCUGCAUG GCUGUCGUCA GCUCGUGUUG UGAAAUGUUG GGUUAAGUCC CGCAACGAGC GCAACCCUUA UCC UUUGUU GCCAGCGGUC CGGCCGGGAA CUCAAAGGAG ACUGCCAGUG AUAAACUGGA GGAAGGUGGG GAUGACGUCA AGUC AUCAU GGCCCUUACG ACCAGGGCUA CACACGUGCU ACAAUGGCGC AUACAAAGAG AAGCGACCUC GCGAGAGCAA GCGGA CCUC AUAAAGUGCG UCGUAGUCCG GAUUGGAGUC UGCAACUCGA CUCCAUGAAG UCGGAAUCGC UAGUAAUCGU GGAUCA GAA UGCCACGGUG AAUACGUUCC CGGGCCUUGU ACACACCGCC CGUCACACCA UGGGAGUGGG UUGCAAAAGA AGUAGGU AG CUUAACCUUC GGGAGGGCGC UUACCACUUU GUGAUUCAUG ACUGGGGUGA AGUCGUAACA AGGUAACCGU AGGGGAAC C UGCGGUUGGA UCACCUCCUU A

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Macromolecule #12: water

MacromoleculeName: water / type: ligand / ID: 12 / Number of copies: 374 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: FEI FALCON II (4k x 4k) / Average electron dose: 2.5 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.76 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 106319
Initial angle assignmentType: PROJECTION MATCHING
Final angle assignmentType: PROJECTION MATCHING

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Atomic model buiding 1

Initial model
PDB IDChain

4v4q

chain_id: AA

4v4q

RefinementSpace: REAL / Protocol: RIGID BODY FIT
Output model

PDB-7oi0:
E.coli delta rbfA pre-30S ribosomal subunit class D

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