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Annotation rule MF_03008
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General rule information [?]

Accession MF_03008
Dates 30-JAN-2009 (Created)
20-NOV-2019 (Last updated, Version 13)
Name eIF3i
Scope
Eukaryota
Templates Q13347 (EIF3I_HUMAN); Q9QZD9 (EIF3I_MOUSE); P79083 (EIF3I_SCHPO); P40217 (EIF3I_YEAST): [Recover all]
Triggered by

Propagated annotation [?]


Identifier, protein and gene names [?]

Identifier
EIF3I
case <OC:Vertebrata>
Protein name
RecName: Full=Eukaryotic translation initiation factor 3 subunit I;
Short=eIF3i;
AltName: Full=Eukaryotic translation initiation factor 3 subunit 2;
AltName: Full=eIF-3-beta;
AltName: Full=eIF3 p36;
else case <OC:Fungi>
Protein name
RecName: Full=Eukaryotic translation initiation factor 3 subunit I;
Short=eIF3i;
AltName: Full=Eukaryotic translation initiation factor 3 39 kDa subunit homolog;
Short=eIF-3 39 kDa subunit homolog;
else
Protein name
RecName: Full=Eukaryotic translation initiation factor 3 subunit I;
Short=eIF3i;
end case
case <OC:Vertebrata>
Gene name
EIF3I, EIF3S2
else case <OC:Drosophilidae>
Gene name
eIF3i, eif3-S2, Trip1
else case <OC:Caenorhabditis>
Gene name
eif-3.I
else case <OC:Fungi>
Gene name
TIF34
end case

Comments [?]

case <OC:Mammalia>
Function Component of the eukaryotic translation initiation factor 3 (eIF-3) complex, which is required for several steps in the initiation of protein synthesis. The eIF-3 complex associates with the 40S ribosome and facilitates the recruitment of eIF-1, eIF-1A, eIF-2:GTP:methionyl-tRNAi and eIF-5 to form the 43S pre-initiation complex (43S PIC). The eIF-3 complex stimulates mRNA recruitment to the 43S PIC and scanning of the mRNA for AUG recognition. The eIF-3 complex is also required for disassembly and recycling of post-termination ribosomal complexes and subsequently prevents premature joining of the 40S and 60S ribosomal subunits prior to initiation. The eIF-3 complex specifically targets and initiates translation of a subset of mRNAs involved in cell proliferation, including cell cycling, differentiation and apoptosis, and uses different modes of RNA stem-loop binding to exert either translational activation or repression.
else
Function Component of the eukaryotic translation initiation factor 3 (eIF-3) complex, which is involved in protein synthesis of a specialized repertoire of mRNAs and, together with other initiation factors, stimulates binding of mRNA and methionyl-tRNAi to the 40S ribosome. The eIF-3 complex specifically targets and initiates translation of a subset of mRNAs involved in cell proliferation.
end case
case <OC:Mammalia>
Subunit Component of the eukaryotic translation initiation factor 3 (eIF-3) complex, which is composed of 13 subunits: EIF3A, EIF3B, EIF3C, EIF3D, EIF3E, EIF3F, EIF3G, EIF3H, EIF3I, EIF3J, EIF3K, EIF3L and EIF3M. The eIF-3 complex appears to include 3 stable modules: module A is composed of EIF3A, EIF3B, EIF3G and EIF3I; module B is composed of EIF3F, EIF3H, and EIF3M; and module C is composed of EIF3C, EIF3D, EIF3E, EIF3K and EIF3L. EIF3C of module C binds EIF3B of module A and EIF3H of module B, thereby linking the three modules. EIF3J is a labile subunit that binds to the eIF-3 complex via EIF3B. The eIF-3 complex interacts with RPS6KB1 under conditions of nutrient depletion. Mitogenic stimulation leads to binding and activation of a complex composed of MTOR and RPTOR, leading to phosphorylation and release of RPS6KB1 and binding of EIF4B to eIF-3.
else case <OC:Vertebrata> and not <OC:Mammalia>
Subunit Component of the eukaryotic translation initiation factor 3 (eIF-3) complex, which is composed of 13 subunits: @gn(EIF3A), @gn(EIF3B), @gn(EIF3C), @gn(EIF3D), @gn(EIF3E), @gn(EIF3F), @gn(EIF3G), @gn(EIF3H), @gn(EIF3I), @gn(EIF3J), @gn(EIF3K), @gn(EIF3L) and @gn(EIF3M).
else case <OC:Drosophilidae>
Subunit Component of the eukaryotic translation initiation factor 3 (eIF-3) complex. The eIF-3 complex interacts with pix.
else
Subunit Component of the eukaryotic translation initiation factor 3 (eIF-3) complex.
end case
Subcellular location Cytoplasm.
case <OC:Mammalia>
Ptm Phosphorylated by TGF-beta type II receptor.
end case
Similarity Belongs to the eIF-3 subunit I family.

Keywords [?]

Cytoplasm
Initiation factor
Protein biosynthesis
case <OC:Mammalia>
Phosphoprotein
end case

Gene Ontology [?]

GO:0003743; Molecular function: translation initiation factor activity.
GO:0001732; Biological process: formation of cytoplasmic translation initiation complex.
GO:0002183; Biological process: cytoplasmic translational initiation.
GO:0005737; Cellular component: cytoplasm.
GO:0005852; Cellular component: eukaryotic translation initiation factor 3 complex.
GO:0016282; Cellular component: eukaryotic 43S preinitiation complex.
GO:0033290; Cellular component: eukaryotic 48S preinitiation complex.

Cross-references [?]

PROSITE PS00678; WD_REPEATS_1; 1;
PS50082; WD_REPEATS_2; 4;
PS50294; WD_REPEATS_REGION; 2;
Pfam PF00400; WD40; 4;

Computed features [?]

REP Repeat_WD40; WD40; 5-7; trigger=yes;

Additional information [?]

Size range 299-356 amino acids
Related rules None
Fusion None


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