HIV-1 Tat (48-60), Cys C-term

The peptide sequence GRKKRRQRRRPPQ-Cys is a unique and potent cell-penetrating peptide that has gained significant attention in the field of drug delivery and targeted therapy. This peptide contains a series of arginine residues followed by a cysteine residue, making it a promising candidate for intracellular delivery of various therapeutic molecules.

Applications: The GRKKRRQRRRPPQ-Cys peptide has been extensively studied for its ability to efficiently transport cargoes, such as drugs, proteins, and nucleic acids, across cell membranes. Its cell-penetrating properties have been used in various research applications, including gene therapy, cancer treatment, and targeted drug delivery strategies. Researchers have successfully conjugated this peptide to a wide range of therapeutic agents to enhance their intracellular uptake and efficacy.

Biological Importance: The arginine-rich nature of the GRKKRRQRRRPPQ-Cys peptide plays a crucial role in its cell-penetrating ability. Arginine residues are known to interact with negatively charged cell membranes and facilitate the internalization of cargo molecules, making this peptide an efficient tool for intracellular delivery. Additionally, the presence of a cysteine residue allows for site-specific conjugation of therapeutic payloads, further enhancing the versatility of this peptide in drug delivery applications.

While more research is needed to fully elucidate the mechanisms underlying the cellular uptake and intracellular trafficking of the GRKKRRQRRRPPQ-Cys peptide, its potential in targeted drug delivery and therapeutic applications is promising. By harnessing the unique properties of this peptide, researchers can develop innovative strategies for delivering therapeutics to specific cell types or tissues, ultimately advancing the field of precision medicine.

HIV-1 Tat (48-60), Cys C-term is a synthetic HIV-derived research peptide. Synthetic peptides derived from HIV proteins have long been used to map B-cell and T-cell determinants, define HLA-restricted cytotoxic T-lymphocyte epitopes, study viral protein interactions, and provide sequence-defined controls for immunological assays. Because HIV proteins are highly variable and peptide function depends strongly on the source protein, residue range, viral subtype, and HLA allele, biological interpretation should be made for the exact product sequence rather than for HIV-derived peptides as a single class.

• HIV-specific T-cell assays
• HLA-restricted epitope mapping
• antibody-binding studies
• viral protein interaction experiments
• sequence-variant and subtype comparisons

For antigenic or viral peptides, HLA restriction, cellular response, and immunological activity should not be inferred solely from the source protein name; the exact sequence, residue numbering, strain or genotype, and experimental system should be considered. For labeled or otherwise modified variants, the modification may also affect binding or assay behavior.

1. T cell recognition of HIV synthetic peptides in natural infection
2. Helper and cytotoxic T cell responses of HIV-1-infected individuals to synthetic peptides