Branched Peptide

Branched peptides are a type of peptide structure where multiple peptide chains (branches) extend from a central core, often derived from lysine. The lysine core provides functional groups (α- and ε-amino groups) for peptide chain attachment. The number of branches can vary (e.g., 2, 4, or 8), depending on the number of lysine tiers used in synthesis. Their high molecular weight, compared to linear peptides, makes them suitable for immunization without the need for carrier protein conjugation. The Multiple Antigenic Peptide (MAP) system is a widely used method that utilizes lysine cores for vaccine development and antibody production.

Characteristics

1. High molar ratio of peptide antigen to core molecule
2. Defined chemical structures
3. Choice of 4-branch, 8 branch, and others
4. Choice of mono-epitope or di-epitope

Advantages

1. Does not require the use of a carrier protein to elicit antibody response
2. Increased coating efficiency on solid surface
3. Enhanced detection sensitivity for solid phase immunoassay
4. Valuable for studies of immunology and vaccine studies

Guidelines

1. Average peptide length: 10-15 residues
2. Favored in N-terminal or internal peptide response
3. Not favored in C-terminal peptide response
4. Cysteines can cause low yield
5. Not amenable for further further purification.