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Angiotensin-(1-7) peptide aggregation is pH-dependent, forming clusters at neutral pH but not acidic pH. Salt concentration can also induce aggregation, suggesting combined factors influence its physical instability.

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Area of Science:

  • Biochemistry
  • Physical Chemistry
  • Pharmacology

Background:

  • Angiotensin-(1-7) possesses significant vasoprotective, antioxidant, and anti-inflammatory properties.
  • Its therapeutic potential is hindered by pH-dependent physical instability in aqueous solutions.
  • A detailed atomistic understanding of this instability is lacking.

Purpose of the Study:

  • To investigate the aggregation behavior of angiotensin-(1-7) using all-atom molecular dynamics simulations.
  • To elucidate the impact of pH, ionic strength, and peptide concentration on angiotensin-(1-7) oligomerization.
  • To provide insights into the mechanisms underlying peptide physical instability.

Main Methods:

  • All-atom molecular dynamics simulations were employed.
  • Simulations were conducted under varying conditions: acidic and neutral pH, physiological and high ionic strength, and varying peptide concentrations.
  • Cluster analysis and amino acid interaction map analysis were utilized to interpret results.

Main Results:

  • Angiotensin-(1-7) exhibited minimal clustering under acidic pH conditions.
  • Aggregation into a single cluster was observed under neutral pH conditions, correlating with reported instability.
  • Increased salt concentration under acidic pH induced aggregation similar to neutral pH conditions.

Conclusions:

  • Peptide aggregation of angiotensin-(1-7) is modulated by a combination of pH and salt concentration.
  • The findings offer a mechanistic basis for understanding and potentially mitigating angiotensin-(1-7) instability.
  • The employed computational protocol is applicable to studying interpeptide interactions in other systems.