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- PDB-4a2i: Cryo-electron Microscopy Structure of the 30S Subunit in Complex ... -
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Open data
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Basic information
Entry | Database: PDB / ID: 4a2i | ||||||
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Title | Cryo-electron Microscopy Structure of the 30S Subunit in Complex with the YjeQ Biogenesis Factor | ||||||
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![]() | RIBOSOME/HYDROLASE / RIBOSOME-HYDROLASE COMPLEX / RIBOSOME ASSEMBLY | ||||||
Function / homology | ![]() mRNA base-pairing translational repressor activity / ornithine decarboxylase inhibitor activity / transcription antitermination factor activity, RNA binding / Hydrolases; Acting on acid anhydrides; In phosphorus-containing anhydrides / misfolded RNA binding / Group I intron splicing / RNA folding / four-way junction DNA binding / negative regulation of translational initiation / regulation of mRNA stability ...mRNA base-pairing translational repressor activity / ornithine decarboxylase inhibitor activity / transcription antitermination factor activity, RNA binding / Hydrolases; Acting on acid anhydrides; In phosphorus-containing anhydrides / misfolded RNA binding / Group I intron splicing / RNA folding / four-way junction DNA binding / negative regulation of translational initiation / regulation of mRNA stability / mRNA regulatory element binding translation repressor activity / positive regulation of RNA splicing / transcription elongation factor complex / DNA endonuclease activity / regulation of DNA-templated transcription elongation / transcription antitermination / DNA-templated transcription termination / maintenance of translational fidelity / mRNA 5'-UTR binding / ribosome biogenesis / regulation of translation / ribosomal small subunit biogenesis / ribosomal small subunit assembly / small ribosomal subunit / small ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / tRNA binding / molecular adaptor activity / cytoplasmic translation / rRNA binding / negative regulation of translation / ribosome / structural constituent of ribosome / translation / response to antibiotic / GTPase activity / mRNA binding / GTP binding / RNA binding / zinc ion binding / membrane / metal ion binding / cytoplasm / cytosol Similarity search - Function | ||||||
Biological species | ![]() ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 16.5 Å | ||||||
![]() | Jomaa, A. / Stewart, G. / Mears, J.A. / Kireeva, I. / Brown, E.D. / Ortega, J. | ||||||
![]() | ![]() Title: Cryo-electron microscopy structure of the 30S subunit in complex with the YjeQ biogenesis factor. Authors: Ahmad Jomaa / Geordie Stewart / Jason A Mears / Inga Kireeva / Eric D Brown / Joaquin Ortega / ![]() Abstract: YjeQ is a protein broadly conserved in bacteria containing an N-terminal oligonucleotide/oligosaccharide fold (OB-fold) domain, a central GTPase domain, and a C-terminal zinc-finger domain. YjeQ ...YjeQ is a protein broadly conserved in bacteria containing an N-terminal oligonucleotide/oligosaccharide fold (OB-fold) domain, a central GTPase domain, and a C-terminal zinc-finger domain. YjeQ binds tightly and stoichiometrically to the 30S subunit, which stimulates its GTPase activity by 160-fold. Despite growing evidence for the involvement of the YjeQ protein in bacterial 30S subunit assembly, the specific function and mechanism of this protein remain unclear. Here, we report the costructure of YjeQ with the 30S subunit obtained by cryo-electron microscopy. The costructure revealed that YjeQ interacts simultaneously with helix 44, the head and the platform of the 30S subunit. This binding location of YjeQ in the 30S subunit suggests a chaperone role in processing of the 3' end of the rRNA as well as in mediating the correct orientation of the main domains of the 30S subunit. In addition, the YjeQ binding site partially overlaps with the interaction site of initiation factors 2 and 3, and upon binding, YjeQ covers three inter-subunit bridges that are important for the association of the 30S and 50S subunits. Hence, our structure suggests that YjeQ may assist in ribosome maturation by preventing premature formation of the translation initiation complex and association with the 50S subunit. Together, these results support a role for YjeQ in the late stages of 30S maturation. | ||||||
History |
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Remark 700 | SHEET DETERMINATION METHOD: DSSP THE SHEETS PRESENTED AS "VA" IN EACH CHAIN ON SHEET RECORDS BELOW ... SHEET DETERMINATION METHOD: DSSP THE SHEETS PRESENTED AS "VA" IN EACH CHAIN ON SHEET RECORDS BELOW IS ACTUALLY AN 5-STRANDED BARREL THIS IS REPRESENTED BY A 6-STRANDED SHEET IN WHICH THE FIRST AND LAST STRANDS ARE IDENTICAL. |
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Structure visualization
Movie |
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 1.2 MB | Display | ![]() |
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PDB format | ![]() | 943.7 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 1 MB | Display | ![]() |
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Full document | ![]() | 1.4 MB | Display | |
Data in XML | ![]() | 133 KB | Display | |
Data in CIF | ![]() | 206.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 1895MC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
-30S RIBOSOMAL PROTEIN ... , 20 types, 20 molecules BCDEFGHIJKLMNOPQRSTU
#2: Protein | Mass: 24253.943 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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#3: Protein | Mass: 23078.785 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#4: Protein | Mass: 23383.002 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#5: Protein | Mass: 15804.282 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#6: Protein | Mass: 11669.371 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#7: Protein | Mass: 16764.406 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#8: Protein | Mass: 14015.361 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#9: Protein | Mass: 14554.882 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#10: Protein | Mass: 11196.988 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#11: Protein | Mass: 12487.200 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#12: Protein | Mass: 13636.961 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#13: Protein | Mass: 12625.753 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#14: Protein | Mass: 11475.364 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#15: Protein | Mass: 10188.687 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#16: Protein | Mass: 9207.572 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#17: Protein | Mass: 9263.946 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#18: Protein | Mass: 6466.477 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#19: Protein | Mass: 9057.626 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#20: Protein | Mass: 9506.190 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#21: Protein | Mass: 6067.081 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
-RNA chain / Protein , 2 types, 2 molecules AV
#1: RNA chain | Mass: 495927.719 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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#22: Protein | Mass: 30816.074 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Plasmid: PDEST17 / Production host: ![]() ![]() |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: ESCHERICHIA COLI 30S RIBOSOMAL SUBUNIT WITH YJEQ PROTEIN BOUND IN THE PRESENCE OF GMP-PNP Type: RIBOSOME |
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Buffer solution | Name: 10 MM TRIS-HCL PH 7.5, 10 MM MAGNESIUM ACETATE, 60 MM NH4CL, 3 MM 2- MERCAPTOETHANOL AND 2 MM GMP-PNP pH: 7.5 Details: 10 MM TRIS-HCL PH 7.5, 10 MM MAGNESIUM ACETATE, 60 MM NH4CL, 3 MM 2- MERCAPTOETHANOL AND 2 MM GMP-PNP |
Specimen | Conc.: 0.9 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Details: FORMVAR PLUS CARBON |
Vitrification | Instrument: FEI VITROBOT MARK III / Cryogen name: ETHANE / Details: BLOT FOR 7 SECONDS IN FEI VITROBOT III |
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Electron microscopy imaging
Microscopy | Model: JEOL 2010F / Date: May 12, 2010 |
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Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 50000 X / Calibrated magnification: 50000 X / Nominal defocus max: 3900 nm / Nominal defocus min: 650 nm / Cs: 1 mm |
Specimen holder | Temperature: 100 K / Tilt angle min: 0 ° |
Image recording | Electron dose: 15 e/Å2 / Film or detector model: KODAK SO-163 FILM |
Image scans | Num. digital images: 150 |
Radiation wavelength | Relative weight: 1 |
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Processing
EM software |
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CTF correction | Details: EACH MICROGRAPH | |||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | |||||||||||||||||||||
3D reconstruction | Method: PROJECTION MATCHING / Resolution: 16.5 Å / Num. of particles: 16228 / Nominal pixel size: 2.54 Å / Actual pixel size: 2.54 Å Details: THE COORDINATES IN THIS ENTRY WERE GENERATED BY MANUAL DOCKING OF THE STRUCTURE OF THE ESCHERICHIA COLI 30S RIBOSOMAL SUBUNIT (2AVY) AND SALMONELLA TYPHYMURIUM (2RCN) INTO THE DENSITY MAP OF ...Details: THE COORDINATES IN THIS ENTRY WERE GENERATED BY MANUAL DOCKING OF THE STRUCTURE OF THE ESCHERICHIA COLI 30S RIBOSOMAL SUBUNIT (2AVY) AND SALMONELLA TYPHYMURIUM (2RCN) INTO THE DENSITY MAP OF THE ESCHERICHIA COLI 30S_YJEQ COMPLEX GENERATED BY CRYO-ELECTRON MICROSCOPY. THE YEJQ PROTEIN WAS FITTED AS THREE SEPARATE DOMAINS: THE OB-FOLD, THE GTPASE DOMAIN, AND THE ZINC-FINGER DOMAIN. THE PROTEIN DATA BANK CONVENTIONS REQUIRE TO ENTER INFORMATION ABOUT THE UNIT CELL, CRYSTAL DATA AND COORDINATE SYSTEM. THESE INFORMATION IS MEANINGLESS IN THIS ENTRY. SUBMISSION BASED ON EXPERIMENTAL DATA FROM EMDB EMD-1895. Symmetry type: POINT | |||||||||||||||||||||
Atomic model building | Protocol: OTHER / Space: REAL / Target criteria: Cross-correlation coefficient / Details: METHOD--MANUAL REFINEMENT PROTOCOL--X-RAY | |||||||||||||||||||||
Atomic model building |
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Refinement | Highest resolution: 16.5 Å | |||||||||||||||||||||
Refinement step | Cycle: LAST / Highest resolution: 16.5 Å
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