Abstract
'Structure determines function' is a consensus in the current biological community, but the structural characteristics corresponding to a certain function have always been a hot field of scientific exploration. A peptide is a bio-active molecule that is between the size of an antibody and a small molecule. Still, the gastrointestinal barrier and the physicochemical properties of peptides have always limited the oral administration of peptides. Therefore, we analyze the main ways oral peptide conversion strategies of peptide modification and permeation enhancers. Based on our analysis of the structure of natural oral peptides, which can be absorbed through the gastrointestinal tract, we believe that the design strategy of natural stapled peptides based on disulfide bonds is good for oral peptide design. This cannot only be used to identify anti-gastrointestinal digestive structural proteins in nature but also provide a solid structural foundation for the construction of new oral peptide drugs.
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