intron homing / intein-mediated protein splicing / ribonuclease P activity / tRNA 5'-leader removal / translation initiation factor activity / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / maturation of SSU-rRNA / ribosome biogenesis / ribosomal small subunit biogenesis / ribosomal small subunit assembly ...intron homing / intein-mediated protein splicing / ribonuclease P activity / tRNA 5'-leader removal / translation initiation factor activity / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / maturation of SSU-rRNA / ribosome biogenesis / ribosomal small subunit biogenesis / ribosomal small subunit assembly / small ribosomal subunit / small ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / endonuclease activity / cytoplasmic translation / tRNA binding / rRNA binding / structural constituent of ribosome / ribosome / translation / ribonucleoprotein complex / GTPase activity / GTP binding / RNA binding / zinc ion binding / cytosol / cytoplasm Similarity search - Function
Translation initiation factor aIF-2, archaea / Ribosomal protein S17 / Small zinc finger protein HVO_2753-like, zinc-binding pocket / Small zinc finger protein HVO_2753-like / Small zinc finger protein HVO_2753-like, Zn-binding pocket / Elongation factor Tu-type domain / Elongation factor Tu domain 4 / Ribosomal protein S27ae / Ribosomal protein S9, archaeal / Ribosomal protein S13, archaeal ...Translation initiation factor aIF-2, archaea / Ribosomal protein S17 / Small zinc finger protein HVO_2753-like, zinc-binding pocket / Small zinc finger protein HVO_2753-like / Small zinc finger protein HVO_2753-like, Zn-binding pocket / Elongation factor Tu-type domain / Elongation factor Tu domain 4 / Ribosomal protein S27ae / Ribosomal protein S9, archaeal / Ribosomal protein S13, archaeal / Ribosomal protein S17, archaeal / Ribosomal protein S6e, archaeal / Ribosomal protein S4, archaeal / Ribosomal protein S12, archaea / Ribosomal protein S3, archaeal / 30S ribosomal protein S3Ae / : / Ribosomal protein S7, archaeal / Ribosomal protein S19e, archaeal / Ribosomal protein S11, archaeal / Ribosomal protein S2, archaeal / Ribosomal protein S14, type Z, archaeal / Diphtheria Toxin Repressor; domain 2 / Ribosomal protein S8e, archaeal / Translation initiation factor 1A (eIF-1A), conserved site / Eukaryotic initiation factor 1A signature. / Translation initiation factor IF- 2, domain 3 / Translation-initiation factor 2 / Intein splicing domain / Translation initiation factor IF- 2 / Translation initiation factor IF-2, domain 3 superfamily / eukaryotic translation initiation factor 1A / Translation initiation factor 1A (eIF-1A) / Intein DOD homing endonuclease / Intein DOD-type homing endonuclease domain profile. / Ribosomal Protein S7 / Ribosomal protein S7/S5 / RNA-binding domain, S1, IF1 type / Intein C-terminal splicing region / Translation initiation factor 1A / IF-1 / Intein C-terminal splicing motif profile. / S1 domain IF1 type profile. / Ribosomal protein L7Ae, archaea / Hint domain C-terminal / Hint (Hedgehog/Intein) domain C-terminal region / Intein N-terminal splicing region / Intein N-terminal splicing motif profile. / Homing endonuclease / Hint domain N-terminal / Hint (Hedgehog/Intein) domain N-terminal region / Hint domain superfamily / Helicase, Ruva Protein; domain 3 - #50 / Ribosomal Protein S5; domain 2 - #10 / Ribosomal Protein S5; domain 2 / Ribosomal protein S19e, conserved site / Ribosomal protein S19e signature. / Ribosomal protein S5, eukaryotic/archaeal / Translation elongation factor EFTu-like, domain 2 / Ribosomal protein S10, eukaryotic/archaeal / Ribosomal protein S17e, conserved site / Ribosomal protein S17e signature. / Ribosomal protein S3Ae, conserved site / Ribosomal protein S3Ae signature. / Ribosomal protein S27a / Ribosomal protein S27a / Ribosomal protein S27a / Ribosomal protein S2, eukaryotic/archaeal / Ribosomal protein S27e signature. / 40S ribosomal protein S29/30S ribosomal protein S14 type Z / Ribosomal protein S4e, N-terminal, conserved site / Ribosomal protein S4e signature. / Elongation factor Tu domain 2 / Ribosomal protein S3, eukaryotic/archaeal / Ribosomal protein S19e / Ribosomal protein S8e, conserved site / Ribosomal protein S19e / Ribosomal protein S8e signature. / Ribosomal_S19e / Ribosomal protein S19A/S15e / Ribosomal protein S17e / Ribosomal protein S17e-like superfamily / Ribosomal S17 / Ribosomal S24e conserved site / Ribosomal protein S24e signature. / Ribosomal protein S4e, N-terminal / RS4NT (NUC023) domain / Ribosomal protein S4, KOW domain / Ribosomal protein S4e / Ribosomal protein S4e, central region / Ribosomal protein S4e, central domain superfamily / Ribosomal family S4e / Ribosomal protein S23, eukaryotic/archaeal / Ribosomal protein S6/S6e/A/B/2, conserved site / Ribosomal protein S6e signature. / Ribosomal protein S24e / Ribosomal protein S24e / Ribosomal protein S27 / Ribosomal protein S27, zinc-binding domain superfamily / Ribosomal protein S27 / Ribosomal protein S17, archaeal/eukaryotic Similarity search - Domain/homology
PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER / METHIONINE / : / : / RNA / RNA (> 10) / RNA (> 100) / RNA (> 1000) / Zn-ribbon RNA-binding protein involved in translation / Small ribosomal subunit protein eS28 ...PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER / METHIONINE / : / : / RNA / RNA (> 10) / RNA (> 100) / RNA (> 1000) / Zn-ribbon RNA-binding protein involved in translation / Small ribosomal subunit protein eS28 / Small ribosomal subunit protein eS31 / Small ribosomal subunit protein uS4 / Small ribosomal subunit protein uS12 / Large ribosomal subunit protein eL8 / Small ribosomal subunit protein uS11 / Small ribosomal subunit protein uS14 / Small ribosomal subunit protein eS32 / Small ribosomal subunit protein eS27 / Small ribosomal subunit protein eS24 / Small ribosomal subunit protein eS6 / Probable translation initiation factor IF-2 / Small ribosomal subunit protein eS8 / Small ribosomal subunit protein eS17 / Small ribosomal subunit protein eS19 / Small ribosomal subunit protein uS10 / Small ribosomal subunit protein uS7 / Translation initiation factor 1A / Small ribosomal subunit protein uS2 / Small ribosomal subunit protein uS9 / Small ribosomal subunit protein uS13 / Small ribosomal subunit protein uS19 / Small ribosomal subunit protein uS3 / Small ribosomal subunit protein uS17 / Small ribosomal subunit protein eS4 / Small ribosomal subunit protein uS8 / Small ribosomal subunit protein uS5 / Small ribosomal subunit protein eS1 / Small ribosomal subunit protein uS15 Similarity search - Component
Biological species
Pyrococcus abyssi GE5 (archaea)
Method
ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.7 Å
Journal: Nucleic Acids Res / Year: 2022 Title: Role of aIF5B in archaeal translation initiation. Authors: Ramy Kazan / Gabrielle Bourgeois / Christine Lazennec-Schurdevin / Eric Larquet / Yves Mechulam / Pierre-Damien Coureux / Emmanuelle Schmitt / Abstract: In eukaryotes and in archaea late steps of translation initiation involve the two initiation factors e/aIF5B and e/aIF1A. In eukaryotes, the role of eIF5B in ribosomal subunit joining is established ...In eukaryotes and in archaea late steps of translation initiation involve the two initiation factors e/aIF5B and e/aIF1A. In eukaryotes, the role of eIF5B in ribosomal subunit joining is established and structural data showing eIF5B bound to the full ribosome were obtained. To achieve its function, eIF5B collaborates with eIF1A. However, structural data illustrating how these two factors interact on the small ribosomal subunit have long been awaited. The role of the archaeal counterparts, aIF5B and aIF1A, remains to be extensively addressed. Here, we study the late steps of Pyrococcus abyssi translation initiation. Using in vitro reconstituted initiation complexes and light scattering, we show that aIF5B bound to GTP accelerates subunit joining without the need for GTP hydrolysis. We report the crystallographic structures of aIF5B bound to GDP and GTP and analyze domain movements associated to these two nucleotide states. Finally, we present the cryo-EM structure of an initiation complex containing 30S bound to mRNA, Met-tRNAiMet, aIF5B and aIF1A at 2.7 Å resolution. Structural data shows how archaeal 5B and 1A factors cooperate to induce a conformation of the initiator tRNA favorable to subunit joining. Archaeal and eukaryotic features of late steps of translation initiation are discussed.
History
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