Peptibodies

Peptibodies are a class of therapeutic molecules that combine features of peptides and antibodies. They are engineered proteins designed to mimic the binding specificity of antibodies but with a smaller molecular size. Typically, a peptibody consists of a peptide sequence fused to a scaffold protein, which can be a portion of an antibody Fc region or another protein. This fusion allows the peptide to be presented in a multivalent format, increasing its binding affinity and avidity to its target. The peptide component is responsible for the specific recognition and binding to a particular antigen, while the scaffold provides stability, a longer serum half-life, and sometimes effector functions. The smaller size compared to full-length antibodies can lead to improved tissue penetration, which is advantageous for targeting certain diseases. Peptibodies are developed using recombinant DNA technology and are expressed in mammalian cell systems. They are being investigated for a range of therapeutic applications, including oncology, autoimmune diseases, and infectious diseases, offering an alternative to traditional antibody therapies with potentially enhanced pharmacokinetic properties.