Crown Bridge Loop

Motif Glossary

Crown Bridge Loop


A motif of six consecutive amino acid residues and two H-bonds in which:

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These distinguish the different conformational variants of the Beta Turn, always found at residues 1–4 of a Crown Bridge Loop.


Leader and Milner-White, Proteins 83:2067–2076 (2015)


1. Crown Bridge Loops are also Crown Bridges. They are presented separately to allow all six residues to be shown.

2. No examples of Crown Bridge Loops encompassing left-handed Beta Turns were found in the database.


Crown Bridge Loops are relatively rare. Many of them are found near the C-termini of α-helices.