Article · Wikipedia archive · Last revised Jul 11, 2026

EIF4G3

Eukaryotic translation initiation factor 4 gamma 3 is a protein that in humans is encoded by the EIF4G3 gene. The gene encodes a protein that functions in translation by aiding the assembly of the ribosome onto the messenger RNA template. Confusingly, this protein is usually referred to as eIF4GII, as although EIF4G3 is the third gene that is similar to eukaryotic translation initiation factor 4 gamma, the second isoform EIF4G2 is not an active translation initiation factor.

Last revised
Jul 11, 2026
Read time
≈ 5 min
Length
1,077 w
Citations
13
Source
EIF4G3
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesEIF4G3, eIF-4G 3, eIF4G 3, eIF4GII, eukaryotic translation initiation factor 4 gamma 3
External IDsOMIM: 603929; MGI: 1923935; HomoloGene: 2789; GeneCards: EIF4G3; OMA:EIF4G3 - orthologs
Orthologs
SpeciesHumanMouse
Entrez
Ensembl
UniProt
RefSeq (mRNA)

NM_001256195
NM_001256198
NM_172703
NM_001355699
NM_001355700

RefSeq (protein)

NP_001185730
NP_001185731
NP_001185732
NP_003751

Location (UCSC)Chr 1: 20.81 – 21.18 MbChr 4: 137.99 – 138.21 Mb
PubMed search34
Wikidata
View/Edit HumanView/Edit Mouse

Eukaryotic translation initiation factor 4 gamma 3 is a protein that in humans is encoded by the EIF4G3 gene.56 The gene encodes a protein that functions in translation by aiding the assembly of the ribosome onto the messenger RNA template.7 Confusingly, this protein is usually referred to as eIF4GII, as although EIF4G3 is the third gene that is similar to eukaryotic translation initiation factor 4 gamma, the second isoform EIF4G2 is not an active translation initiation factor.8

Interactions

EIF4G3 has been shown to interact with PABPC1.9

References

References

  1. GRCh38: Ensembl release 89: ENSG00000075151Ensembl, May 2017
  2. GRCm38: Ensembl release 89: ENSMUSG00000028760Ensembl, May 2017
  3. "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. Gradi A, Imataka H, Svitkin YV, Rom E, Raught B, Morino S, Sonenberg N (Jan 1998). "A novel functional human eukaryotic translation initiation factor 4G". Mol. Cell. Biol. 18 (1): 334–42. doi:10.1128/mcb.18.1.334. PMC 121501. PMID 9418880.
  6. "Entrez Gene: EIF4G3 eukaryotic translation initiation factor 4 gamma, 3".
  7. Gingras AC, Raught B, Sonenberg N (1999). "eIF4 initiation factors: effectors of mRNA recruitment to ribosomes and regulators of translation". Annu. Rev. Biochem. 68: 913–63. doi:10.1146/annurev.biochem.68.1.913. PMID 10872469.
  8. Gradi A, Imataka H, Svitkin YV, Rom E, Raught B, Morino S, Sonenberg N (1998). "A novel functional human eukaryotic translation initiation factor 4G". Mol. Cell. Biol. 18 (1): 334–42. doi:10.1128/mcb.18.1.334. PMC 121501. PMID 9418880.
  9. Imataka H, Gradi A, Sonenberg N (Dec 1998). "A newly identified N-terminal amino acid sequence of human eIF4G binds poly(A)-binding protein and functions in poly(A)-dependent translation". EMBO J. 17 (24): 7480–9. doi:10.1093/emboj/17.24.7480. PMC 1171091. PMID 9857202.
Further reading

Further reading