This review describes a selection of macrocyclic natural products and structurally modified analogs containing peptidic and non-peptidic elements as structural features that potentially modulate cellular permeability. Examples range from exclusively peptidic structures like cyclosporin A or phepropeptins to compounds with mostly non-peptidic character, such as telomestatin or largazole. Furthermore, semisynthetic approaches and synthesis platforms to generate general and focused libraries of compounds at the interface of cyclic peptides and non-peptidic macrocycles are discussed.

Cyclic peptides and non-peptidic macrocycles can modulate cellular permeability, offering potential therapeutic applications in various diseases.

Frontier Between Cyclic Peptides and Macrocycles.

Key Takeaway: Cyclic peptides and non-peptidic macrocycles can modulate cellular permeability, offering potential therapeutic applications in various diseases.