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. 2021 Jun 18;8:691368. doi: 10.3389/fnut.2021.691368

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Copyright © 2021 Zhao, Wang, Zheng and Liu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Structural illustration of sweet-tasting proteins and the sweet taste receptor. The three-dimensional structures of sweet-tasting proteins: (A) monellin (PDB: 2O9U); (B) thaumatin (PDB: 1RQW); (C) brazzein (PDB: 2LY5); (D) curculin (PDB: 2DPF); (E) neoculin (PDB: 2D04); (F) mabinlin II (PDB: 2DS2). The α-helix, β-sheet and loops in the structures were colored in red, yellow, and green, respectively. (G) Cartoon representation of the interaction between the sweet-tasting protein monellin (colored in purple) and the sweet taste receptor T1R2/T1R3. The VFTM (Venus flytrap module), CRD (cysteine-rich domain) and TMD (transmembrane domain) of the receptor are colored in green (T1R2) and yellow (T1R3), cyan and blue, respectively.