Product Description |
Frequencies of Subtype-Specific Amino Acid Combinations in HIV-B- and HIV-C-Infected Individuals and an Outline of the Overlapping 25-mer Peptides Used as Proteasomal Substrates. For example, CF1 fragment, subtype B, Subtype-Specific Motif 27V, 41T, AWVKVVEEKAFSPEVIPMF, was used for the study.
Antigen processing is one crucial step in the pathway responsible for HLA presentation of HIV epitopes to CTL. It is a multistep process, where viral proteins synthesized in infected cells are first degraded by cytosolic proteasomes. A multilevel linear model was used to examine the influence of the presenting HLA allelic frequencies, HIV region (NF1, CF1, MF2&CF2), and ethnic group (Africans, whites) on epitope yield. A strong relationship between epitope yield and HLA allelic frequency was found for NF1, CF1 and MF2&CF2, but, whereas similar variation in HLA frequency had similar effects on epitope yields in NF1 and MF2&CF2 regardless of ethnic group, a significant difference between ethnic groups was found with respect to CF1 (p < 0.0001). Vulnerable regions within other HIV proteins may also demonstrate variable adaptation to the same HLA selective pressure, in line with the different HIV B and HIV C CF1 epitope yields.
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Scientific Background | AWVKVVEEKAFSPEVIPMF is a 19-residue synthetic peptide with the sequence Ala-Trp-Val-Lys-Val-Val-Glu-Glu-Lys-Ala-Phe-Ser-Pro-Glu-Val-Ile-Pro-Met-Phe. The sequence contains 0 Asp and 3 Glu residues, contributing anionic character near neutral pH; contains 3 aromatic residues that can contribute to hydrophobic or aromatic interactions; has a relatively high hydrophobic-residue fraction that can influence aqueous solubility and surface adsorption. These sequence-derived properties describe the reagent chemically; no specific receptor, enzyme, pathway, disease association, or biological activity is assigned without product-specific experimental evidence. |
Experimental Notes | Sequence-derived chemical properties support reagent selection and experimental planning but do not establish biological function. Solubility, aggregation, adsorption, conjugation efficiency, and assay performance should be validated under the intended experimental conditions. |
