p2a peptide function mediate “cleavage” of polypeptides - P2a序列 mediate “cleavage” of polypeptides

Systematic comparison of 2a peptides for cloning multi genes in a polycistronic vector The P2A peptide is a critical tool in molecular biology, enabling the simultaneous expression of multiple genes from a single genetic construct. Its primary function is to induce ribosomal skipping during protein translation, a mechanism that effectively "cleaves" a polyprotein into individual protein products作者：AA Shaimardanova·2019·被引用次数：62—2A peptidesare composed of 16–20 amino acids and originate from viral RNA. The most common2A peptidesused to produce multicistronic vectors are F2A (2A.... This ability to facilitate multicistronic expression makes the P2A peptide invaluable for a wide range of research applications, from gene therapy to the development of genetically modified organisms.

Understanding the P2A Peptide's Mechanism

At its core, the P2A peptide functions by interacting with the ribosome during translation. It is a short sequence, typically 18-22 amino acids long, derived from viral RNA作者：AL Szymczak-Workman·2012·被引用次数：319—The small 2A peptide sequences, when cloned between genes,allow for efficient, stoichiometric production of discrete protein productswithin a .... When this sequence is inserted between two or more coding sequences within a single messenger RNA (mRNA) molecule, it causes the ribosome to pause and skip the formation of a peptide bond at a specific site. This phenomenon is often referred to as "ribosomal skipping" or "self-cleavage," though it's important to note that the P2A peptide itself doesn't undergo a chemical cleavage. Instead, it tricks the translational machinery into terminating or pausing translation at its C-terminus, leading to the release of the upstream protein and the continuation of translation for downstream proteins. This process results in the co-translational generation of discrete, functional proteins from a single transcript.

Applications and Advantages of P2A Peptides

The primary advantage of using P2A peptides lies in their ability to achieve efficient and stoichiometric expression of multiple genes. This is particularly useful when the genes need to be expressed at comparable levels. Unlike other methods for multicistronic expression, such as Internal Ribosome Entry Sites (IRES), 2A peptides are generally smaller and can offer higher cleavage efficiencyPart:BBa K3338003. This means that researchers can construct more compact genetic vectors and achieve more reliable expression of all desired proteins.

Key applications include:

* Gene Therapy: P2A peptides are employed to deliver multiple therapeutic genes simultaneously to target cells, enhancing the efficacy of treatments for diseases like cancer.

* Protein Production: They facilitate the co-expression of proteins in various expression systems, including mammalian cells and yeast, enabling the production of complex protein assemblies or antibodies.Part:BBa K3338003

* Genetic Engineering: In the development of genetically modified organisms, P2A peptides allow for the introduction and coordinated expression of multiple genes, leading to desired traits.

* Research Tools: For basic research, P2A peptides are used to study protein-protein interactions, create signaling pathways, or express fluorescent reporters alongside other proteins of interest in cellular and animal models.作者：G Trichas·2008·被引用次数：309—2A peptides result in the co-translational 'cleavage' of proteinsand are an attractive alternative to the internal ribosomal entry site. They ...

Common 2A Peptide Variants and Considerations

While P2A is a widely used variant, other 2A peptides, such as E2A, T2A, and F2A, are also available and have been characterized for their cleavage efficiencies. The choice of which 2A peptide to use can depend on the specific cell type, the genes being expressed, and the desired level of expression.作者：GA Luke·2015·被引用次数：25—The unique activity of2A peptideshas led to their use as tools for co-expression of two (or more) proteins in biomedicine and biotechnology [ ... It's also worth noting that "self-cleavage" is not always complete, and a small fraction of the full-length polyprotein may still be produced. Researchers often optimize the choice and context of the 2A peptide to minimize any such incomplete cleavage events and ensure the production of distinct protein products.2014年9月4日—The P2A peptide can be used in a research context toallow multicistronic expression of geneswithout traditional methods of: multiple promoters ... The small size of these peptides also makes them suitable as linkers between genes, facilitating their cloning into multicistronic vectors.

In summary, the P2A peptide and its related variants are powerful molecular tools that enable the coordinated expression of multiple genes. Their mechanism of inducing ribosomal skipping during translation allows for the production of discrete proteins from a single mRNA transcript, offering significant advantages in various fields of biotechnology and biomedical research.