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Polyproline structures. Space-filling representation of polyproline-20 labeled with Alexa Fluor 488 (FRET donor) at the C-terminal cysteine and Alexa Fluor 594 (FRET acceptor) at the N-terminal glycine in the all-trans conformation (A) and with residue 8 (purple) in the cis conformation (B). (B Inset) A polyproline fragment with one cis peptide bond (shown as “ω = 0”). One of the remaining trans peptide bonds is also indicated (“ω = 180”).
