Synthesis of Collagen Mimetic Peptides

Collagen presents formidable challenges for direct examination using biophysical techniques due to its considerable size, limited solubility, and intricate hierarchical arrangement. To surmount these obstacles, collagen mimetic peptides, comprising repetitive (Gly-X-Y)n sequences, have emerged as invaluable tools for probing the sequential and structural fundamentals of collagen's functionality and pathogenesis. This chapter is dedicated to elucidating the synthesis of collagen mimetic peptides, commencing with the generation of triple-helical peptide models of collagen and an exposition on solid-phase peptide synthesis. It covers various aspects including solid supports, terminal protective groups, side chain protection, activating agents, and chromogenic reagents. General procedures for solid-phase peptide synthesis are delineated alongside specific methodologies for crafting collagen mimetic peptides such as (Gly-Pro-Hyp)10, FAM-modified (Gly-Pro-Hyp)7Gly, and DOTA-modified (Gly-Hyp-Hyp)10. Technical hurdles encountered in solid-phase peptide synthesis, such as incomplete synthesis and diminished efficiency, are addressed. Moreover, innovative synthetic techniques like native chemical ligation, ynamides-mediated peptide synthesis, and enzyme-catalyzed peptide synthesis are introduced.