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Practical protocols for stepwise solid-phase synthesis of cysteine-containing peptides.

Y M Angell1, J Alsina, F Albericio

  • 1Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA.

The Journal of Peptide Research : Official Journal of the American Peptide Society
|October 18, 2002
PubMed
Summary

Minimize cysteine racemization during peptide synthesis by optimizing coupling conditions. Recommended methods include specific ester/activator combinations and hindered bases for safer cysteine incorporation in automated and manual solid-phase peptide synthesis.

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Area of Science:

  • Organic Chemistry
  • Biochemistry
  • Peptide Synthesis

Background:

  • Cysteine racemization is a significant challenge in solid-phase peptide synthesis.
  • Common coupling reagents like HATU, HBTU, and BOP with standard bases (NMM, DIEA) lead to high levels of cysteine racemization (5-33%).

Purpose of the Study:

  • To identify and detail conditions for 'safe' cysteine incorporation with minimal racemization.
  • To provide reliable methods for both automated and manual solid-phase peptide synthesis.

Main Methods:

  • Evaluation of various coupling reagents and conditions on model peptides (H-Gly-Cys-Phe-NH(2), dihydrooxytocin).
  • Testing of O-pentafluorophenyl (O-Pfp) esters, carbodiimides (DIPCDI), and preactivation strategies.
  • Investigation of hindered bases (lutidine, TEMP, OHA, DB[DMAP]) as alternatives to DIEA and NMM.

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Main Results:

  • Recommended methods include O-Pfp ester/HOBt in DMF, DIPCDI/HOBt in DMF, and specific HBTU/HOBt/TMP protocols in DMF or CH(2)Cl(2)/DMF.
  • Hindered bases effectively minimize cysteine racemization even with in situ coupling protocols.
  • These optimized methods are routinely used for synthesizing complex peptide analogs, including BPTI.

Conclusions:

  • Specific coupling conditions and the use of hindered bases are crucial for preventing cysteine racemization.
  • The study provides practical, validated protocols for achieving high-purity cysteine-containing peptides.