Pro-Thr-Pro-Ser amide is a tetrapeptide rich in proline residues that promote distinct backbone kinks and β-turn-like behavior. Researchers use it to evaluate flexibility, polarity effects, and solvent-sensitive dynamics. The C-terminal amide enhances structural stability and reduces terminal charge.
CAT No: R2325
CAS No:121269-85-0
Synonyms/Alias:Pro-Thr-Pro-Ser amide;121269-85-0;N-(1-amino-3-hydroxy-1-oxopropan-2-yl)-1-[3-hydroxy-2-(pyrrolidine-2-carbonylamino)butanoyl]pyrrolidine-2-carboxamide;DTXSID80401551;
Pro-Thr-Pro-Ser amide is a synthetic tetrapeptide composed of the amino acids proline, threonine, and serine, with an amidated C-terminus that can influence its biochemical stability and functional properties. As a short peptide sequence, it serves as a valuable tool in peptide research, offering a defined structure for the study of sequence-specific interactions, enzymatic processing, and structure-activity relationships. The inclusion of both polar and nonpolar residues, as well as the presence of a terminal amide group, makes this compound particularly relevant for investigations into peptide conformation, receptor recognition, and post-translational modification effects. Its defined sequence and modifiable backbone provide researchers with a versatile platform for exploring fundamental questions in protein science, molecular biology, and chemical biology.
Peptide structure-function studies: Pro-Thr-Pro-Ser amide is widely utilized in probing the relationship between primary sequence and biological activity in peptides. Its defined tetrapeptide sequence allows for systematic investigation of how specific amino acid arrangements and terminal modifications, such as amidation, influence secondary structure formation and receptor interactions. Researchers can use this peptide as a model substrate in conformational analyses, employing techniques like NMR spectroscopy or circular dichroism to assess the impact of proline-induced kinks and the role of threonine and serine hydroxyl groups in hydrogen bonding networks.
Enzymatic substrate characterization: The sequence of this tetrapeptide makes it a suitable substrate for studying the specificity and catalytic mechanisms of peptidases and proteases. Its proline-rich motif and amidated C-terminus can be used to elucidate enzyme recognition patterns, cleavage preferences, and resistance to enzymatic degradation. By incorporating Pro-Thr-Pro-Ser amide into in vitro assays, enzymologists can dissect the influence of sequence context on substrate turnover, providing insights into enzyme-substrate dynamics that are critical for both basic research and inhibitor development.
Peptide synthesis optimization: As a representative short peptide, Pro-Thr-Pro-Ser amide is frequently employed to evaluate and refine solid-phase peptide synthesis protocols. Its sequence, which includes both hindered proline residues and polar side chains, poses synthetic challenges that are useful for benchmarking coupling reagents, resin choices, and deprotection strategies. Analytical comparison of synthesized batches enables chemists to optimize reaction conditions, minimize side reactions such as diketopiperazine formation, and improve overall peptide yield and purity.
Receptor binding and signaling studies: The structural features of this tetrapeptide render it useful in screening assays for peptide-binding proteins, including G protein-coupled receptors and other cell surface receptors that recognize short, proline-containing motifs. By incorporating labeled or modified versions of the peptide into binding assays, researchers can map interaction sites, quantify binding affinities, and explore the functional consequences of sequence variation. Such studies are instrumental in elucidating the molecular basis of peptide-mediated signaling pathways and in guiding the design of novel ligands.
Analytical method development: Pro-Thr-Pro-Ser amide serves as a standard or reference compound in the development and validation of analytical techniques tailored for peptide detection and quantification. Its well-defined molecular weight, sequence complexity, and chemical properties make it suitable for calibrating mass spectrometry, high-performance liquid chromatography, and capillary electrophoresis systems. Method developers can use this peptide to assess instrument sensitivity, resolution, and reproducibility, thereby ensuring robust analytical performance in peptide-focused research and quality control settings.
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