English: The native state of serpins is an equilibrium between a fully-stressed state (left) and a partially relaxed state (right). The five-stranded A-sheet (light blue) contains two functionally important regions for the serpin's mechanism, the breach and the shutter. The Reactive Centre Loop (RCL, blue) exists in a dynamic equilibrium between the fully exposed conformation (left) and a conformation where it is partially inserted into the breach of the A-sheet (right). (PDB: 1QLP, 1YXA).
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↑Elliott PR, Lomas DA, Carrell RW, Abrahams JP. (1996). "Inhibitory conformation of the reactive loop of alpha 1-antitrypsin". Nature Structural & Molecular Biology3 (8): 676–81. DOI:10.1038/nsb0896-676. PMID8756325.