Cyclo(-Pro-Thr) is a diketopiperazine formed by cyclization of proline and threonine, generating a rigid heterocycle with defined stereochemistry. The structure encourages β-turn mimicry and reduces backbone flexibility. Researchers use it to explore conformational constraints, peptide stabilization, and ligand-design principles. Its compact ring system supports detailed structural and mechanistic studies.
CAT No: R2280
CAS No:227777-31-3
Synonyms/Alias:Cyclo(-Pro-Thr);227777-31-3;Cyclo(Pro-Thr);(3S,8aS)-3-[(1R)-1-hydroxyethyl]-2,3,6,7,8,8a-hexahydropyrrolo[1,2-a]pyrazine-1,4-dione;(3S,8aS)-Hexahydro-3-[(1R)-1-hydroxyethyl]pyrrolo[1,2-a]pyrazine-1,4-dione;MFCD05663455;HY-P5050;(3S,8aS)-3-((R)-1-hydroxyethyl)hexahydropyrrolo[1,2-a]pyrazine-1,4-dione;AKOS006293957;DA-62585;FC108331;CS-0675916;
Cyclo(-Pro-Thr), also known as cyclo(Prolyl-Threonyl) or cyclo(Pro-Thr) dipeptide, is a naturally occurring cyclic dipeptide that has garnered significant interest in biochemical and pharmaceutical research. Characterized by its stable diketopiperazine ring structure, this compound is formed through the cyclization of proline and threonine amino acids. Its unique conformational rigidity and resistance to enzymatic degradation make it a valuable scaffold in peptide chemistry and molecular design. The hydrophobic and hydrogen-bonding capabilities of cyclo(-Pro-Thr) further enhance its utility in a range of scientific applications, enabling researchers to explore its interactions with biological macromolecules and its influence on various biochemical pathways.
Peptide-based drug discovery: Cyclo(-Pro-Thr) serves as a versatile building block in the development of novel peptide-based therapeutics. Its cyclic structure imparts enhanced metabolic stability compared to linear peptides, which is crucial for improving the bioavailability and half-life of peptide candidates. Researchers often incorporate this dipeptide into peptide libraries to screen for compounds with desirable pharmacological profiles, leveraging its conformational constraints to fine-tune receptor binding and selectivity. In this context, cyclo(-Pro-Thr) can act as a template for the design of peptidomimetics that mimic biologically active peptides while exhibiting improved resistance to proteolytic enzymes.
Biochemical pathway studies: The use of cyclo(Pro-Thr) in the investigation of enzymatic processes and metabolic pathways is well-documented. Its resistance to degradation allows it to function as a molecular probe in studies aiming to elucidate the roles of cyclic dipeptides in cellular signaling or metabolic regulation. By tracing its interactions with specific enzymes or receptors, scientists can gain insights into the mechanisms underlying peptide-mediated modulation of biological functions. These studies contribute to a deeper understanding of how cyclic dipeptides influence cellular homeostasis and intercellular communication.
Protein-protein interaction modulation: Cyclo(-Pro-Thr) is frequently employed in research focused on modulating protein-protein interactions. Its rigid, cyclic backbone can disrupt or stabilize specific protein complexes, making it a valuable tool for probing the structural requirements of protein binding sites. By introducing this dipeptide into peptide inhibitors or mimics, researchers can investigate how conformational constraints affect the affinity and specificity of protein-protein interactions. This approach is instrumental in the rational design of molecules aimed at targeting challenging protein interfaces in various biological systems.
Natural product biosynthesis studies: The presence of cyclo(Prolyl-Threonyl) in microbial and fungal metabolites has prompted investigations into its role in natural product biosynthesis. By studying its formation and function within these organisms, scientists can uncover new biosynthetic pathways and enzymatic processes responsible for the generation of cyclic dipeptides. These findings not only expand our knowledge of microbial metabolism but also inform the development of biotechnological methods for the sustainable production of valuable diketopiperazines and related compounds.
Chemical biology tool development: Cyclo(-Pro-Thr) is increasingly recognized as a useful chemical biology tool for the exploration of peptide function and structure-activity relationships. Its incorporation into synthetic peptides or molecular probes enables the systematic investigation of how cyclization affects biological activity, stability, and cell permeability. This information is critical for guiding the rational design of functional peptides and for developing innovative research tools that facilitate the study of complex biological systems.
Analytical method development: In analytical chemistry, cyclo(-Pro-Thr) is valuable for the calibration and validation of chromatographic and spectrometric techniques used to detect and quantify cyclic dipeptides in biological samples. Its well-defined structure and stability make it an ideal reference standard for method development, allowing researchers to optimize detection sensitivity and specificity for diketopiperazines. These analytical advancements are essential for supporting studies on peptide metabolism, food chemistry, and natural product research, where the accurate identification and quantification of cyclic dipeptides are required for meaningful scientific conclusions.
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