Some generalizations based on numerous crystal-structure analyses of 8
- to 16-residue peptides that form 3(10)- and/or alpha-helices are pre
sented. New data include five decapeptides, each containing one non-st
andard residue, dipropylglycine or dibutylglycine. Also presented is a
new model for an ion transport channel based on the structures of thr
ee zervamicin polymorphs.