Angiotensin II (1-4), human is an endogenous peptide produced from AT I by angiotensin-converting-enzyme (ACE). Angiotensin II binds the AT II type 1 (AT1) receptor, stimulating GPCRs in vascular smooth muscle cells and increasing intracellular Ca2+ levels. Angiotensin II also acts at the Na+/H+ exchanger in the proximal tubules of the kidney.
Angiotensin II (1-4), human is a synthetic peptide fragment corresponding to the N-terminal tetrapeptide sequence of the full-length human angiotensin II molecule. As a truncated derivative of the well-characterized octapeptide hormone, this peptide retains distinct biochemical properties that make it a valuable tool for investigating the structure-activity relationships within the renin-angiotensin system. Its defined sequence, comprising the initial four amino acids of angiotensin II, enables researchers to dissect the functional contributions of specific residues to receptor binding, enzymatic processing, and downstream signaling events. The compound is widely recognized for its role in probing the mechanisms underlying peptide hormone activity and for its utility in peptide-based research models.
Peptide structure-activity studies: Angiotensin II (1-4), human serves as an essential reference molecule for elucidating the minimal sequence requirements necessary for biological activity in the angiotensin peptide family. By comparing the functional effects of this tetrapeptide fragment to those of the full-length octapeptide, investigators can determine which residues are critical for receptor interaction and signal transduction. This comparative approach enables a deeper understanding of the molecular determinants governing peptide-receptor specificity and informs the rational design of novel analogs with tailored properties.
Enzymatic substrate profiling: The tetrapeptide is frequently utilized as a model substrate in studies examining the specificity and kinetics of peptidases and proteases involved in angiotensin metabolism. Its defined sequence allows for precise monitoring of cleavage events by enzymes such as aminopeptidases and carboxypeptidases, facilitating the mapping of enzymatic pathways that regulate peptide hormone turnover. These investigations contribute to a broader understanding of proteolytic processing in physiological and pathophysiological contexts.
Peptide receptor binding assays: Researchers employ angiotensin II (1-4), human in in vitro receptor binding studies to assess the affinity and selectivity of peptide fragments for angiotensin receptors. By using this tetrapeptide in competition or displacement assays, it is possible to characterize the binding profiles of truncated peptides and delineate the structural features required for high-affinity interaction. Such studies are instrumental in the development of peptide-based antagonists or agonists with potential research applications.
Analytical method development: The defined composition and stability of the angiotensin II (1-4) fragment make it a suitable standard or calibration compound in analytical techniques such as high-performance liquid chromatography (HPLC) and mass spectrometry. Its use as a reference peptide supports the accurate quantification and identification of angiotensin-derived fragments in complex biological samples, streamlining method validation and quality control in peptide analysis workflows.
Peptide synthesis validation: The synthesis of angiotensin II (1-4), human provides a practical benchmark for optimizing solid-phase peptide synthesis protocols and purification strategies. Its relatively short sequence and well-characterized properties enable peptide chemists to evaluate coupling efficiency, protecting group strategies, and chromatographic separation techniques. This application supports the broader field of custom peptide production by enabling reliable assessment of synthetic methodologies and product integrity.
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