Structural Basis of Karrikin and Non-natural Strigolactone Perception in Physcomitrella patens.

Marco Bürger, Kiyoshi Mashiguchi, Hyun Jee Lee, Misaki Nakano, Kodai Takemoto, Yoshiya Seto, Shinjiro Yamaguchi, Joanne Chory

Cell reports 2019 Jan 22

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In plants, strigolactones are perceived by the dual receptor-hydrolase DWARF14 (D14). D14 belongs to the superfamily of α/β hydrolases and is structurally similar to the karrikin receptor KARRIKIN INSENSITIVE 2 (KAI2). The moss Physcomitrella patens is an ideal model system for studying this receptor family, because it includes 11 highly related family members with unknown ligand specificity. We present the crystal structures of three Physcomitrella D14/KAI2-like proteins and describe a loop-based mechanism that leads to a permanent widening of the hydrophobic substrate gorge. We have identified protein clades that specifically perceive the karrikin KAR1 and the non-natural strigolactone isomer (-)-5-deoxystrigol in a highly stereoselective manner. Copyright © 2019 The Authors. Published by Elsevier Inc. All rights reserved.

Citation

Marco Bürger, Kiyoshi Mashiguchi, Hyun Jee Lee, Misaki Nakano, Kodai Takemoto, Yoshiya Seto, Shinjiro Yamaguchi, Joanne Chory. Structural Basis of Karrikin and Non-natural Strigolactone Perception in Physcomitrella patens. Cell reports. 2019 Jan 22;26(4):855-865.e5