Eukaryotic initiation factor 4A-III (110-119)

Eukaryotic initiation factor 4A-III (110-119) is a synthetic peptide fragment corresponding to amino acids 110 through 119 of the eIF4A-III protein, a member of the DEAD-box RNA helicase family. This peptide represents a segment of a key factor involved in the regulation of mRNA translation and nonsense-mediated mRNA decay (NMD) in eukaryotic cells. As a well-defined sequence derived from a functionally significant region of eIF4A-III, it provides a targeted tool for probing the structural and mechanistic aspects of translation initiation and mRNA surveillance pathways. Its relevance extends to studies of RNA-protein interactions, post-transcriptional gene regulation, and the molecular machinery that governs gene expression fidelity.

Peptide mapping: The peptide fragment is utilized in mass spectrometry-based peptide mapping and proteomics workflows to validate the sequence identity and post-translational modification status of eIF4A-III. By serving as a reference standard or internal control, it assists researchers in confirming the presence and integrity of the parent protein in cell lysates or purified complexes. This application is particularly valuable in studies aiming to dissect the composition of messenger ribonucleoprotein particles (mRNPs) and to monitor dynamic changes in the interactome associated with translation regulation.

Antibody epitope characterization: The defined sequence of this peptide enables its use in the generation and validation of antibodies specific to the corresponding region of eIF4A-III. Researchers employ the fragment as an immunogen or as a target in binding assays to map antibody epitopes, assess specificity, and optimize antibody-based detection methods such as western blotting, immunoprecipitation, or immunofluorescence. Such applications are critical for elucidating the spatial and temporal distribution of eIF4A-III within cellular compartments and for investigating its functional partners.

Protein-peptide interaction studies: As a discrete segment of the eIF4A-III protein, the peptide is instrumental in in vitro binding assays designed to evaluate interactions with other proteins, nucleic acids, or small molecules. By immobilizing or labeling the peptide, researchers can quantitatively assess binding affinities, map interaction domains, and identify potential modulators of eIF4A-III activity. These studies contribute to a deeper understanding of the molecular determinants underlying RNA helicase function and the assembly of translation initiation complexes.

Functional assays in translation research: The peptide serves as a molecular probe in functional assays examining the mechanistic role of eIF4A-III in translation initiation and mRNA surveillance. By introducing the fragment into cell-free or reconstituted systems, scientists can investigate its impact on the formation of translation complexes, its competitive effects on full-length protein function, or its capacity to disrupt or mimic specific protein-protein or protein-RNA interactions. These approaches aid in delineating the sequence-specific contributions of eIF4A-III to the fidelity and regulation of gene expression.

Peptide synthesis and method development: The defined nature of this peptide makes it a valuable standard for optimizing synthetic protocols and analytical techniques in peptide chemistry. It is used to calibrate chromatographic systems, validate peptide purification strategies, and benchmark analytical methods such as HPLC and mass spectrometry. Additionally, it provides a model substrate for assessing the efficiency and selectivity of enzymatic or chemical modifications, supporting the broader field of peptide-based research tool development.

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