WVKCFNCGKEGHIARNCRA

The role of zinc in retroviral gag protein function has been studied using high-resolution nuclear magnetic resonance spectroscopy. The nucleocapsid protein (NCP, p7) isolated directly from infectious HIV-1 particles was examined.

It was found that the HIV-1 NCP binds two equivalents of zinc tightly and stoichiometrically. Two-dimensional NMR spectroscopic studies revealed that zinc binding induces the formation of folded domains that are similar to structures observed for relevant retroviral-type (RT) zinc finger peptides WVKCFNCGKEGHIARNCRA.

This finding supports the hypothesis that the inability of mutant proteins (with substituted Cys and His residues) to package viral RNA results from deficient zinc-binding capability. This may have significant consequences in the development of vaccines for the prevention of AIDS.

WVKCFNCGKEGHIARNCRA is a 19-residue synthetic peptide with the sequence Trp-Val-Lys-Cys-Phe-Asn-Cys-Gly-Lys-Glu-Gly-His-Ile-Ala-Arg-Asn-Cys-Arg-Ala. The sequence contains 3 cysteine residues, providing potential thiol/disulfide chemistry when the thiol is available; contains 2 Lys and 2 Arg residues, contributing cationic character. 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.

• thiol-selective conjugation or immobilization studies
• LC-MS/HPLC analytical method development
• sequence-specific assay controls

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.