Eukaryotic translation initiation factor 3 subunit D

Eukaryotic translation initiation factor 3 subunit D (eIF3D) is a core component of the eIF-3 complex that regulates translation initiation in eukaryotes (UniProt: O15371). The protein specifically recognizes and binds the 7-methylguanosine cap of mRNAs and facilitates recruitment of initiation factors to the 40S ribosomal subunit. eIF3D plays a selective role in translating mRNAs encoding proteins involved in cell proliferation, differentiation, and apoptosis, and is required for ribosomal recycling and prevention of premature ribosomal subunit joining.

EIF3D is broadly expressed and functions as part of the conserved translation initiation machinery. Its role in selective mRNA translation makes it relevant to cellular processes requiring dynamic protein synthesis regulation. UniProt records no annotated primary disease associations for this protein.

In Alzheimer's disease brain tissue, EIF3D is upregulated relative to age-matched controls (Chaparral AD proteomics), with a mean log2 fold-change of 0.84 across post-mortem samples analyzed by quantitative proteomics. This elevation may suggest altered translation initiation capacity or enhanced protein synthesis of specific transcripts in AD pathology, though the functional significance of increased eIF3D levels in disease progression remains to be determined.