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Updated: Jun 28, 2026

Crystal Structure of the N-terminal Domain of Ryanodine Receptor from Plutella xylostella
Published on: November 30, 2018
Crystal structure of a ten-amino acid protein
Shinya Honda1, Toshihiko Akiba, Yusuke S Kato
1National Institute of Advanced Industrial Science and Technology, Central 6, Tsukuba 305-8566, Japan. s.honda@aist.go.jp
Abstract:
What is the smallest protein? This is actually not such a simple question to answer, because there is no established consensus among scientists as to the definition of a protein. We describe here a designed molecule consisting of only 10 amino acids. Despite its small size, its essential characteristics, revealed by its crystal structure, solution structure, thermal stability, free energy surface, and folding pathway network, are consistent with the properties of natural proteins. The existence of this kind of molecule deepens our understanding of proteins and impels us to define an "ideal protein" without inquiring whether the molecule actually occurs in nature.
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