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Structure paper

TitleThe nucleoplasmic phase of pre-40S formation prior to nuclear export.
Journal, issue, pagesNucleic Acids Res, Vol. 50, Issue 20, Page 11924-11937, Year 2022
Publish dateNov 11, 2022
AuthorsJingdong Cheng / Benjamin Lau / Matthias Thoms / Michael Ameismeier / Otto Berninghausen / Ed Hurt / Roland Beckmann /
PubMed AbstractBiogenesis of the small ribosomal subunit in eukaryotes starts in the nucleolus with the formation of a 90S precursor and ends in the cytoplasm. Here, we elucidate the enigmatic structural ...Biogenesis of the small ribosomal subunit in eukaryotes starts in the nucleolus with the formation of a 90S precursor and ends in the cytoplasm. Here, we elucidate the enigmatic structural transitions of assembly intermediates from human and yeast cells during the nucleoplasmic maturation phase. After dissociation of all 90S factors, the 40S body adopts a close-to-mature conformation, whereas the 3' major domain, later forming the 40S head, remains entirely immature. A first coordination is facilitated by the assembly factors TSR1 and BUD23-TRMT112, followed by re-positioning of RRP12 that is already recruited early to the 90S for further head rearrangements. Eventually, the uS2 cluster, CK1 (Hrr25 in yeast) and the export factor SLX9 associate with the pre-40S to provide export competence. These exemplary findings reveal the evolutionary conserved mechanism of how yeast and humans assemble the 40S ribosomal subunit, but reveal also a few minor differences.
External linksNucleic Acids Res / PubMed:36321656 / PubMed Central
MethodsEM (single particle)
Resolution3.0 - 7.4 Å
Structure data

EMDB-32792, PDB-7wtn:
Cryo-EM structure of a yeast pre-40S ribosomal subunit - State Tsr1-1 (with Rps2)
Method: EM (single particle) / Resolution: 3.4 Å

EMDB-32793, PDB-7wto:
Cryo-EM structure of a yeast pre-40S ribosomal subunit - State Tsr1-1 (without Rps2)
Method: EM (single particle) / Resolution: 3.5 Å

EMDB-32794, PDB-7wtp:
Cryo-EM structure of a yeast pre-40S ribosomal subunit - State Tsr1-2 (with Rps2)
Method: EM (single particle) / Resolution: 3.8 Å

EMDB-32795, PDB-7wtq:
Cryo-EM structure of a yeast pre-40S ribosomal subunit - State Tsr1-2 (without Rps2)
Method: EM (single particle) / Resolution: 3.7 Å

EMDB-32796, PDB-7wtr:
Cryo-EM structure of a yeast pre-40S ribosomal subunit - State Tsr1-3
Method: EM (single particle) / Resolution: 3.5 Å

EMDB-32797: Cryo-EM structure of a yeast pre-40S ribosomal subunit - State Rrp12-A
Method: EM (single particle) / Resolution: 4.0 Å

EMDB-32798: Cryo-EM structure of a yeast pre-40S ribosomal subunit - State Rio2-C
Method: EM (single particle) / Resolution: 4.8 Å

EMDB-32799, PDB-7wts:
Cryo-EM structure of a human pre-40S ribosomal subunit - State UTP14
Method: EM (single particle) / Resolution: 3.2 Å

EMDB-32800, PDB-7wtt:
Cryo-EM structure of a human pre-40S ribosomal subunit - State RRP12-A1 (with CK1)
Method: EM (single particle) / Resolution: 3.1 Å

EMDB-32801, PDB-7wtu:
Cryo-EM structure of a human pre-40S ribosomal subunit - State RRP12-A1 (without CK1)
Method: EM (single particle) / Resolution: 3.0 Å

EMDB-32802, PDB-7wtv:
Cryo-EM structure of a human pre-40S ribosomal subunit - State RRP12-A2
Method: EM (single particle) / Resolution: 3.5 Å

EMDB-32803, PDB-7wtw:
Cryo-EM structure of a human pre-40S ribosomal subunit - State RRP12-A3
Method: EM (single particle) / Resolution: 3.2 Å

EMDB-32804, PDB-7wtx:
Cryo-EM structure of a human pre-40S ribosomal subunit - State RRP12-B1
Method: EM (single particle) / Resolution: 3.1 Å

EMDB-32806, PDB-7wtz:
Cryo-EM structure of a human pre-40S ribosomal subunit - State RRP12-B2
Method: EM (single particle) / Resolution: 3.0 Å

EMDB-32807, PDB-7wu0:
Cryo-EM structure of a human pre-40S ribosomal subunit - State RRP12-B3
Method: EM (single particle) / Resolution: 3.3 Å

EMDB-32808: Cryo-EM structure of a human pre-40S ribosomal subunit - State RIOK2-D2
Method: EM (single particle) / Resolution: 7.4 Å

Chemicals

ChemComp-ZN:
Unknown entry

ChemComp-SAH:
S-ADENOSYL-L-HOMOCYSTEINE / S-Adenosyl-L-homocysteine

Source
  • saccharomyces cerevisiae (brewer's yeast)
  • baker's yeast (brewer's yeast)
  • homo sapiens (human)
  • human (human)
KeywordsRIBOSOME / ribosome biogenesis / 40S ribosome

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