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- PDB-6neq: Structure of human mitochondrial translation initiation factor 3 ... -
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Open data
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Basic information
Entry | Database: PDB / ID: 6neq | |||||||||
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Title | Structure of human mitochondrial translation initiation factor 3 bound to the small ribosomal subunit-Class-II | |||||||||
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![]() | RIBOSOMAL PROTEIN / Human mitochondrial translation Initiation Factor 3 | |||||||||
Function / homology | ![]() Mitochondrial translation elongation / Mitochondrial translation termination / mitochondrial translational initiation / peptide biosynthetic process / mitochondrial ribosome binding / translation factor activity, RNA binding / mitochondrial ribosome assembly / Mitochondrial translation initiation / positive regulation of mitochondrial translation / mitochondrial ribosome ...Mitochondrial translation elongation / Mitochondrial translation termination / mitochondrial translational initiation / peptide biosynthetic process / mitochondrial ribosome binding / translation factor activity, RNA binding / mitochondrial ribosome assembly / Mitochondrial translation initiation / positive regulation of mitochondrial translation / mitochondrial ribosome / mitochondrial small ribosomal subunit / ribosome disassembly / mitochondrial translation / Mitochondrial protein degradation / ribosomal small subunit binding / translation initiation factor activity / kinase activity / regulation of translation / ribosome binding / ribosomal small subunit assembly / small ribosomal subunit / small ribosomal subunit rRNA binding / tRNA binding / cell population proliferation / mitochondrial inner membrane / rRNA binding / ribosome / structural constituent of ribosome / translation / protein domain specific binding / ribonucleoprotein complex / mRNA binding / apoptotic process / nucleolus / mitochondrion / RNA binding / nucleoplasm Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.32 Å | |||||||||
![]() | Sharma, M. / Koripella, R. / Agrawal, R. | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Structure of Human Mitochondrial Translation Initiation Factor 3 Bound to the Small Ribosomal Subunit. Authors: Ravi K Koripella / Manjuli R Sharma / Md Emdadul Haque / Paul Risteff / Linda L Spremulli / Rajendra K Agrawal / ![]() Abstract: The human mitochondrial translational initiation factor 3 (IF3) carries mitochondrial-specific amino acid extensions at both its N and C termini (N- and C-terminal extensions [NTE and CTE, ...The human mitochondrial translational initiation factor 3 (IF3) carries mitochondrial-specific amino acid extensions at both its N and C termini (N- and C-terminal extensions [NTE and CTE, respectively]), when compared with its eubacterial counterpart. Here we present 3.3- to 3.5-Å-resolution cryoelectron microscopic structures of the mammalian 28S mitoribosomal subunit in complex with human IF3. Unique contacts observed between the 28S subunit and N-terminal domain of IF3 explain its unusually high affinity for the 28S subunit, whereas the position of the mito-specific NTE suggests NTE's role in binding of initiator tRNA to the 28S subunit. The location of the C-terminal domain (CTD) clarifies its anti-association activity, whereas the orientation of the mito-specific CTE provides a mechanistic explanation for its role in destabilizing initiator tRNA in the absence of mRNA. Furthermore, our structure hints at a possible role of the CTD in recruiting leaderless mRNAs for translation initiation. Our findings highlight unique features of IF3 in mitochondrial translation initiation. | |||||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 1.4 MB | Display | ![]() |
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PDB format | ![]() | 1.1 MB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 1.1 MB | Display | ![]() |
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Full document | ![]() | 1.1 MB | Display | |
Data in XML | ![]() | 143.8 KB | Display | |
Data in CIF | ![]() | 235.7 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 9358MC ![]() 9362C ![]() 6nf8C 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
-RNA chain , 1 types, 1 molecules A
#1: RNA chain | Mass: 306932.719 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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+28S ribosomal protein ... , 26 types, 26 molecules CELPQacdejpGIJNhikBFKORUbf
-Protein , 5 types, 5 molecules gmonz
#17: Protein | Mass: 40505.719 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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#21: Protein | Mass: 13581.974 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#22: Protein | Mass: 60587.832 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#31: Protein | Mass: 22968.365 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#32: Protein | Mass: 28213.160 Da / Num. of mol.: 1 / Fragment: residues 32-278 / Source method: isolated from a natural source / Source: (natural) ![]() |
-Details
Has protein modification | Y |
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-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: Structure of human mitochondrial translation initiation factor 3 bound to the small ribosomal subunit Type: RIBOSOME Details: Structure of human mitochondrial translation initiation factor 3 bound to the small ribosomal subunit Entity ID: all / Source: NATURAL | ||||||||||||
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Source (natural) |
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Buffer solution | pH: 7.6 | ||||||||||||
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||
Specimen support | Details: unspecified | ||||||||||||
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: OTHER / Accelerating voltage: 300 kV / Illumination mode: OTHER |
Electron lens | Mode: OTHER |
Image recording | Electron dose: 70 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
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Processing
EM software |
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CTF correction | Type: NONE | ||||||||||||
3D reconstruction | Resolution: 3.32 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 198355 / Symmetry type: POINT | ||||||||||||
Atomic model building | B value: 97 / Protocol: OTHER | ||||||||||||
Atomic model building | PDB-ID: 3JD5 Accession code: 3JD5 / Source name: PDB / Type: experimental model |