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Related Experiment Videos

Solution stability of linear vs. cyclic RGD peptides.

S J Bogdanowich-Knipp1, S Chakrabarti, T D Williams

  • 1Department of Pharmaceutical Chemistry, Simons Research Laboratories, The University of Kansas, Lawrence 66047, USA.

The Journal of Peptide Research : Official Journal of the American Peptide Society
|July 29, 1999
PubMed
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Cyclizing Arg-Gly-Asp (RGD) peptides enhances their stability by reducing degradation. Cyclic RGD peptides show significantly improved solution stability, particularly at neutral pH, compared to linear counterparts.

Area of Science:

  • Biochemistry
  • Peptide Chemistry
  • Drug Stability

Background:

  • Arg-Gly-Asp (RGD) peptides are crucial in biological processes but susceptible to degradation.
  • Aspartic acid residue in RGD peptides causes chemical instability and loss of activity.
  • Cyclization is a strategy to enhance peptide structural rigidity and stability.

Purpose of the Study:

  • To compare the solution stability of linear and cyclic RGD peptides.
  • To investigate the impact of pH and buffer concentration on peptide degradation.
  • To elucidate the degradation pathways and mechanisms of linear and cyclic RGD peptides.

Main Methods:

  • Synthesis and characterization of linear (Arg-Gly-Asp-Phe-OH) and cyclic (cyclo-(1, 6)-Ac-Cys-Arg-Gly-Asp-Phe-Pen-NH2) peptides.

Related Experiment Videos

  • Stability studies conducted in buffers across a pH range of 2-12 at 50°C.
  • Degradation kinetics and product identification using Reversed-phase HPLC, FAB-MS, ESI-MS, MALDI-TOF, LC-MS, and NMR spectroscopy.

    • Main Results:

    • Both linear and cyclic peptides followed pseudo-first-order degradation kinetics.
    • The cyclic peptide demonstrated approximately 30-fold greater stability than the linear peptide at pH 7.
    • Degradation primarily involved the aspartic acid residue, with mechanisms changing with increased pH; cyclic peptide stability decreased above pH 8 due to disulfide bond degradation.

    Conclusions:

    • Cyclization of RGD peptides via disulfide bond linkage significantly enhances structural rigidity and solution stability, especially at neutral pH.
    • The increased stability of cyclic RGD peptides is attributed to restricted conformational flexibility, preventing aspartic acid-mediated backbone attack.
    • Disulfide bond degradation becomes a limiting factor for cyclic peptide stability at pH values above 8.