Cysteine Confusion | Chemical & Engineering News
Volume 89 Issue 11 | p. 5 | Letters
Issue Date: March 14, 2011

Cysteine Confusion

Department: Letters

With regard to the concentrate “Peptide Is Reduced to Killing Microbes” (C&EN, Jan. 24, page 31): Am I getting old and uninformed about naming, or does the article referring to “the peptide’s three cysteine bridges” contain a mistake?

Last I knew, cysteine is the amino acid that has the “–SH” residue. Cystine is the one that has the “–S–S–” bridge. How can there be a bridge between two cysteines when, by identity, they are not bridged to any other?

James Hill
Emporia, Kan.

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