Small Natural Cyclic Peptides from DBAASP Database

Area of Science:

• Biochemistry
• Pharmacology
• Microbiology

Background:

• Antimicrobial peptides (AMPs) show promise against microbial resistance but suffer from low target affinity and poor in vivo stability.
• Macrocyclization enhances peptide properties, making macrocyclic peptides attractive drug candidates.
• Natural products often feature macrocyclic structures, indicating nature's solutions for peptide drug development.

Purpose of the Study:

• To explore natural cyclic peptides from the DBAASP database.
• To analyze small cyclic peptides (≤25 amino acids) based on composition, cyclization bonds, targets, and mechanisms of action.
• To enhance understanding of naturally occurring cyclic peptides for potential therapeutic applications.

Main Methods:

• Data mining of the DBAASP database, a repository of peptide activities and structures.
• Analysis of small ribosomal and non-ribosomal cyclic peptides.
• Categorization based on amino acid composition, cyclization methods, targeted organisms, and action mechanisms.

Main Results:

• Identification and characterization of various natural small cyclic peptides.
• Correlation of structural features (e.g., amino acid composition, cyclization type) with bioactivity.
• Insights into diverse targets and mechanisms of action employed by these natural compounds.

Conclusions:

• Natural cyclic peptides, particularly small ones, possess inherent properties that can overcome AMP limitations.
• The DBAASP database provides valuable data for understanding and developing cyclic peptide therapeutics.
• Nature's strategies in cyclic peptide design offer a roadmap for combating antimicrobial resistance.