[English] 日本語
Yorodumi Papers
- Database of articles cited by EMDB/PDB/SASBDB data -

+
Search query

Keywords
Structure methods
Author
Journal
IF

-
Structure paper

TitleMechanisms of human mitochondrial leaderless mRNA translation initiation.
Journal, issue, pagesNat Commun, Year 2026
Publish dateApr 4, 2026
AuthorsShuangjie Shen / Yinghua Xu / Daniel L Kober / Jinfan Wang /
PubMed AbstractMitochondrial translation is essential for cellular function, and its dysregulation is associated with mitochondrial disorders and cancer. However, the mechanisms by which human mitochondrial ...Mitochondrial translation is essential for cellular function, and its dysregulation is associated with mitochondrial disorders and cancer. However, the mechanisms by which human mitochondrial ribosomes initiate translation remain poorly understood, particularly because mitochondrial mRNAs generally lack the 5' untranslated regions that guide translation initiation in bacterial and cytoplasmic systems. Using real-time single-molecule fluorescence measurements, biochemical assays, and cryo-EM analysis, we show that human mitochondrial translation initiation occurs through two parallel pathways. In one pathway, leaderless mRNA first loads onto the 28S small subunit, followed by recruitment of the 39S large subunit to form the 55S initiation complex. In the second pathway, a preassembled 55S monosome directly loads onto leaderless mRNA. Both pathways require recruitment of mtIF2 and fMet-tRNA before mRNA binding. However, the monosome-loading pathway tolerates non-formylated Met-tRNA and is suppressed by mtIF3. Together, these findings define the heterogeneous pathways of human mitochondrial translation initiation on leaderless mRNAs.
External linksNat Commun / PubMed:41935065
MethodsEM (single particle)
Resolution2.5 - 3.01 Å
Structure data

EMDB-70533: Human 28S in complex with mtIF2 and mtIF3
Method: EM (single particle) / Resolution: 3.01 Å

70544

9ojm

EMDB-70544, PDB-9ojm:
Human mitochondrial 28S PIC with tRNA and mtIF2
Method: EM (single particle) / Resolution: 2.5 Å

Chemicals

ChemComp-MG:
Unknown entry

ChemComp-K:
Unknown entry

ChemComp-GTP:
GUANOSINE-5'-TRIPHOSPHATE / GTP, energy-carrying molecule*YM

ChemComp-ZN:
Unknown entry

ChemComp-FES:
FE2/S2 (INORGANIC) CLUSTER

ChemComp-GDP:
GUANOSINE-5'-DIPHOSPHATE / GDP, energy-carrying molecule*YM

ChemComp-ATP:
ADENOSINE-5'-TRIPHOSPHATE / ATP, energy-carrying molecule*YM

ChemComp-HOH:
WATER

Source
  • homo sapiens (human)
KeywordsRIBOSOME / Mitochondrial Ribosome 28S pre-initiation complex

+
About Yorodumi Papers

-
News

-
Feb 9, 2022. New format data for meta-information of EMDB entries

New format data for meta-information of EMDB entries

  • Version 3 of the EMDB header file is now the official format.
  • The previous official version 1.9 will be removed from the archive.

Related info.:EMDB header

External links:wwPDB to switch to version 3 of the EMDB data model

-
Aug 12, 2020. Covid-19 info

Covid-19 info

URL: https://pdbj.org/emnavi/covid19.php

New page: Covid-19 featured information page in EM Navigator.

Related info.:Covid-19 info / Mar 5, 2020. Novel coronavirus structure data

+
Mar 5, 2020. Novel coronavirus structure data

Novel coronavirus structure data

Related info.:Yorodumi Speices / Aug 12, 2020. Covid-19 info

External links:COVID-19 featured content - PDBj / Molecule of the Month (242)：Coronavirus Proteases

+
Jan 31, 2019. EMDB accession codes are about to change! (news from PDBe EMDB page)

EMDB accession codes are about to change! (news from PDBe EMDB page)

  • The allocation of 4 digits for EMDB accession codes will soon come to an end. Whilst these codes will remain in use, new EMDB accession codes will include an additional digit and will expand incrementally as the available range of codes is exhausted. The current 4-digit format prefixed with “EMD-” (i.e. EMD-XXXX) will advance to a 5-digit format (i.e. EMD-XXXXX), and so on. It is currently estimated that the 4-digit codes will be depleted around Spring 2019, at which point the 5-digit format will come into force.
  • The EM Navigator/Yorodumi systems omit the EMD- prefix.

Related info.:Q: What is EMD? / ID/Accession-code notation in Yorodumi/EM Navigator

External links:EMDB Accession Codes are Changing Soon! / Contact to PDBj

+
Jul 12, 2017. Major update of PDB

Major update of PDB

  • wwPDB released updated PDB data conforming to the new PDBx/mmCIF dictionary.
  • This is a major update changing the version number from 4 to 5, and with Remediation, in which all the entries are updated.
  • In this update, many items about electron microscopy experimental information are reorganized (e.g. em_software).
  • Now, EM Navigator and Yorodumi are based on the updated data.

External links:wwPDB Remediation / Enriched Model Files Conforming to OneDep Data Standards Now Available in the PDB FTP Archive

-
Yorodumi Papers

Database of articles cited by EMDB/PDB/SASBDB data

  • Database of articles cited by EMDB, PDB, and SASBDB entries
  • Using PubMed data

Related info.:EMDB / PDB / SASBDB / Yorodumi / EMN Papers / Changes in new EM Navigator and Yorodumi

Read more