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Structure paper

TitleA distinct assembly pathway of the human 39S late pre-mitoribosome.
Journal, issue, pagesNat Commun, Vol. 12, Issue 1, Page 4544, Year 2021
Publish dateJul 27, 2021
AuthorsJingdong Cheng / Otto Berninghausen / Roland Beckmann /
PubMed AbstractAssembly of the mitoribosome is largely enigmatic and involves numerous assembly factors. Little is known about their function and the architectural transitions of the pre-ribosomal intermediates. ...Assembly of the mitoribosome is largely enigmatic and involves numerous assembly factors. Little is known about their function and the architectural transitions of the pre-ribosomal intermediates. Here, we solve cryo-EM structures of the human 39S large subunit pre-ribosomes, representing five distinct late states. Besides the MALSU1 complex used as bait for affinity purification, we identify several assembly factors, including the DDX28 helicase, MRM3, GTPBP10 and the NSUN4-mTERF4 complex, all of which keep the 16S rRNA in immature conformations. The late transitions mainly involve rRNA domains IV and V, which form the central protuberance, the intersubunit side and the peptidyltransferase center of the 39S subunit. Unexpectedly, we find deacylated tRNA in the ribosomal E-site, suggesting a role in 39S assembly. Taken together, our study provides an architectural inventory of the distinct late assembly phase of the human 39S mitoribosome.
External linksNat Commun / PubMed:34315873 / PubMed Central
MethodsEM (single particle)
Resolution3.1 - 5.7 Å
Structure data

EMDB-12919, PDB-7oi6:
Cryo-EM structure of late human 39S mitoribosome assembly intermediates, state 1
Method: EM (single particle) / Resolution: 5.7 Å

EMDB-12920, PDB-7oi7:
Cryo-EM structure of late human 39S mitoribosome assembly intermediates, state 2
Method: EM (single particle) / Resolution: 3.5 Å

EMDB-12921, PDB-7oi8:
Cryo-EM structure of late human 39S mitoribosome assembly intermediates, state 3A
Method: EM (single particle) / Resolution: 3.5 Å

EMDB-12922, PDB-7oi9:
Cryo-EM structure of late human 39S mitoribosome assembly intermediates, state 3B
Method: EM (single particle) / Resolution: 3.3 Å

EMDB-12923, PDB-7oia:
Cryo-EM structure of late human 39S mitoribosome assembly intermediates, state 3C
Method: EM (single particle) / Resolution: 3.2 Å

EMDB-12924, PDB-7oib:
Cryo-EM structure of late human 39S mitoribosome assembly intermediates, state 3D
Method: EM (single particle) / Resolution: 3.3 Å

EMDB-12925, PDB-7oic:
Cryo-EM structure of late human 39S mitoribosome assembly intermediates, state 4
Method: EM (single particle) / Resolution: 3.1 Å

EMDB-12926, PDB-7oid:
Cryo-EM structure of late human 39S mitoribosome assembly intermediates, state 5A
Method: EM (single particle) / Resolution: 3.7 Å

EMDB-12927, PDB-7oie:
Cryo-EM structure of late human 39S mitoribosome assembly intermediates, state 5B
Method: EM (single particle) / Resolution: 3.5 Å

Chemicals

ChemComp-MG:
Unknown entry

ChemComp-ZN:
Unknown entry

ChemComp-PNS:
4'-PHOSPHOPANTETHEINE / Phosphopantetheine

ChemComp-C:
CYTIDINE-5'-MONOPHOSPHATE / Cytidine monophosphate

ChemComp-A:
ADENOSINE-5'-MONOPHOSPHATE / Adenosine monophosphate

ChemComp-SAM:
S-ADENOSYLMETHIONINE / S-Adenosyl methionine

Source
  • homo sapiens (human)
  • Human (human)
KeywordsRIBOSOME / 39S mitoribosome / ribosome biogenesis

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