Title:A Comprehensive Review on Therapeutic Potentials of Natural Cyclic
Peptides
Volume: 18
Issue: 5
Author(s): Renu Saharan, Suresh Kumar*, Sukhbir Lal Khokra, Sunil Singh, Abhishek Tiwari, Varsha Tiwari, Biswa Mohan Sahoo and Manish Kumar
Affiliation:
- Bharat Institute of Pharmacy, Pehladpur, Babain, Kurukshetra- 136156, Haryana, India
Keywords:
Cyclic peptides, therapeutic potential, bio-availability, anti-tumor, anthelmintic and anti-viral, platelet aggregation, inhibiting activity.
Abstract: Cyclic peptides have emerged as a promising class of organic compounds that possess
polypeptide chains with a cyclic ring structure. There is a circular sequence of bonds in which
the ring structure is formed via linkage between one end of the peptide bond and the other end
with an amide bond or any other chemically stable bonds like ether, thioether, lactone, and disulfide.
Generally, the cyclic peptides are isolated from natural resources like invertebrate animals,
micro-organisms of marine habitats, and higher plants. These cyclic peptides possess unique
structures with diverse pharmacological activities. Nowadays, cyclic peptides possess superior
therapeutic value due to several reasons such as greater resistance to enzymatic degradation (in
vivo) and higher bio-availability. Some of these cyclic peptides are rich in leucine, proline, while
some have other amino acids as their major constituents. Numerous novel cyclic peptides isolated
from natural sources are successfully developed as bioactive products. Recently, cyclic peptides
derived from natural resources have attracted attention for exploring their numerous beneficial
effects. Moreover, it is reported that natural cyclic peptides exhibit various therapeutic activities
like an anthelmintic, ACE inhibitor, anti-tumor, microtubule inhibitor, anti-fungal, antimalarial,
and platelet aggregation inhibiting activity. In this review, various cyclic peptides are
reported with structures and biological activities that are isolated from various natural sources.
The natural cyclic peptides possess a wide spectrum of biological activities and can become a
drug of the future for replacing the existing drugs which develop resistance.