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In molecular biology, initiation factors are proteins that bind to the small subunit of the ribosome during the initiation of translation, a part of protein biosynthesis. [ 1 ] Initiation factors can interact with repressors to slow down or prevent translation.
Eukaryotic initiation factors (eIFs) are proteins or protein complexes involved in the initiation phase of eukaryotic translation.These proteins help stabilize the formation of ribosomal preinitiation complexes around the start codon and are an important input for post-transcription gene regulation.
A bacterial initiation factor (IF) is a protein that stabilizes the initiation complex for polypeptide translation. Translation initiation is essential to protein synthesis and regulates mRNA translation fidelity and efficiency in bacteria. [1] The 30S ribosomal subunit, initiator tRNA, and mRNA form an initiation complex for elongation. [2]
Eukaryotic initiation factor 3 (eIF3) is a multiprotein complex that functions during the initiation phase of eukaryotic translation. [2] It is essential for most forms of cap-dependent and cap-independent translation initiation.
Eukaryotic Initiation Factor 2 (eIF2) is an eukaryotic initiation factor.It is required for most forms of eukaryotic translation initiation. eIF2 mediates the binding of tRNA i Met to the ribosome in a GTP-dependent manner. eIF2 is a heterotrimer consisting of an alpha (also called subunit 1, EIF2S1), a beta (subunit 2, EIF2S2), and a gamma (subunit 3, EIF2S3) subunit.
Translation initiation is the process by which the ribosome and its associated factors bind to an mRNA and are assembled at the start codon. This process is defined as either cap-dependent, in which the ribosome binds initially at the 5' cap and then travels to the stop codon, or as cap-independent, where the ribosome does not initially bind ...
The 43S preinitiation complex (43S PIC) is a ribonucleoprotein complex that exists during an early step of eukaryotic translation initiation. The 43S PIC contains the small ribosomal subunit (40S) bound by the initiation factors eIF1, eIF1A, eIF3, and the eIF2-Met-tRNA i Met-GTP ternary complex (eIF2-TC).
Eukaryotic translation initiation factor 1 (eIF1) is a protein that in humans is encoded by the EIF1 gene.It is related to yeast SUI1. [5] [6] [7]eIF1 interacts with the eukaryotic small ribosomal subunit and eIF3, and is a component of the 43S preinitiation complex (PIC).