Pro-Leu pairs a turn-inducing proline with hydrophobic leucine, creating a dipeptide ideal for studying β-turn and helix-capping behavior. Backbone constraints imposed by proline strongly influence conformational preferences. Researchers assess its role in local structure formation within larger peptides. Applications include folding simulations, motif design, and enzyme-recognition studies.
CAT No: R2573
CAS No:52899-07-7
Synonyms/Alias:H-Pro-Leu-OH;52899-07-7;Pro-leu;L-prolyl-L-leucine;(S)-4-Methyl-2-((S)-pyrrolidine-2-carboxamido)pentanoic acid;L-Pro-L-Leu;CHEBI:74791;CHEMBL293494;(2S)-4-methyl-2-[[(2S)-pyrrolidine-2-carbonyl]amino]pentanoic acid;L-Leucine, L-prolyl-;DTXSID80393341;Prolyl-leucine;(2S)-4-methyl-2-(((2S)-pyrrolidin-1-ium-2-carbonyl)amino)pentanoate;(2S)-4-methyl-2-(((2S)-pyrrolidine-2-carbonyl)amino)pentanoic acid;(2S)-4-methyl-2-[[(2S)-pyrrolidin-1-ium-2-carbonyl]amino]pentanoate;((Benzyloxy)carbonyl)-L-prolyl-D-leucine;MFCD00037871;SCHEMBL6373762;DTXCID70344201;BDBM50188501;STL527240;AKOS010421057;CS-W010402;HY-W009686;DA-64268;FP108158;G82709;Q27144902;4-Methyl-2-[(pyrrolidine-2-carbonyl)-amino]-pentanoic acid;(S)-4-Methyl-2-((S)-pyrrolidine-2-carboxamido)pentanoicacid;(S)-4-Methyl-2-[((S)-pyrrolidine-2-carbonyl)-amino]-pentanoic acid;
Pro-Leu is a synthetic dipeptide composed of the amino acids proline and leucine, linked via a peptide bond. As a member of the dipeptide class, it serves as a valuable model compound in peptide chemistry and biochemistry, offering insights into peptide structure, stability, and function. The unique conformational properties imparted by the cyclic structure of proline and the hydrophobicity of leucine make Pro-Leu particularly relevant for research into peptide folding, sequence-activity relationships, and enzymatic processing. Its defined structure and physicochemical characteristics support a range of applications in both academic and industrial research settings, where understanding peptide behavior is essential for advancing knowledge in molecular biology, enzymology, and pharmaceutical sciences.
Peptide synthesis research: Pro-Leu is frequently employed as a reference substrate and intermediate in solid-phase and solution-phase peptide synthesis. Its use allows researchers to optimize coupling conditions, evaluate protecting group strategies, and assess the efficiency of peptide bond formation, especially when incorporating secondary amines such as proline. By serving as a model for the synthesis of proline-containing sequences, this dipeptide helps refine synthetic protocols and troubleshoot challenges related to steric hindrance or sequence-dependent reactivity.
Enzymatic hydrolysis studies: Due to its defined dipeptide structure, Pro-Leu is widely utilized in assays investigating the specificity and kinetics of peptidases and proteases, including dipeptidyl peptidases and aminopeptidases. Researchers use it to characterize enzyme substrate preferences, map cleavage sites, and analyze catalytic mechanisms. Such studies contribute to a deeper understanding of proteolytic pathways and facilitate the development of enzyme inhibitors or activity assays relevant to diverse fields, from biochemistry to drug discovery.
Peptide transport and metabolism research: The dipeptide serves as a model substrate for studying peptide transporters, such as the proton-coupled oligopeptide transporters (PepT1 and PepT2), in cellular and membrane systems. By tracking the uptake and intracellular processing of Pro-Leu, investigators can elucidate the transport kinetics, substrate specificity, and regulatory mechanisms of these vital proteins. Insights gained from these experiments inform broader research into nutrient absorption, drug delivery, and metabolic regulation.
Structural and conformational analysis: Owing to the conformational rigidity introduced by proline and the hydrophobic side chain of leucine, Pro-Leu is a useful probe in studies of peptide secondary structure, folding dynamics, and intramolecular interactions. Techniques such as nuclear magnetic resonance (NMR) spectroscopy, circular dichroism (CD), and molecular modeling leverage this dipeptide to investigate turn motifs, backbone flexibility, and the influence of sequence context on peptide architecture. These analyses advance the understanding of structure-function relationships in both natural and designed peptides.
Analytical method development: Pro-Leu is often used as a standard or calibration compound in chromatographic and mass spectrometric analyses of peptides and amino acid derivatives. Its well-characterized retention and ionization properties make it suitable for validating analytical protocols, quantifying enzymatic activity, or monitoring peptide synthesis processes. By providing a reliable reference point, the dipeptide enhances the accuracy and reproducibility of peptide analysis in research and quality control laboratories.
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