National Natural Science Foundation of China (NSFC)
21732008
中国
Other government
CIFMS-2021-I2M-1-029
中国
Other government
2018YFA0901900
中国
引用
ジャーナル: Angew Chem Int Ed Engl / 年: 2024 タイトル: Characterization and Engineering of Two Highly Paralogous Sesquiterpene Synthases Reveal a Regioselective Reprotonation Switch. 著者: Dan Ye / Yi-Zhen Shao / Wen-Rui Li / Zhen-Jia Cui / Ting Gong / Jin-Ling Yang / Hai-Qiang Wang / Jun-Gui Dai / Ke-Ping Feng / Ming Ma / Shuang-Gang Ma / Yun-Bao Liu / Ping Zhu / Shi-Shan Yu / 要旨: Sesquiterpene synthases (STPSs) catalyze carbocation-driven cyclization reactions that can generate structurally diverse hydrocarbons. The deprotonation-reprotonation process is widely used in STPSs ...Sesquiterpene synthases (STPSs) catalyze carbocation-driven cyclization reactions that can generate structurally diverse hydrocarbons. The deprotonation-reprotonation process is widely used in STPSs to promote structural diversity, largely attributable to the distinct regio/stereoselective reprotonations. However, the molecular basis for reprotonation regioselectivity remains largely understudied. Herein, we analyzed two highly paralogous STPSs, Artabotrys hexapetalus (-)-cyperene synthase (AhCS) and ishwarane synthase (AhIS), which catalyze reactions that are distinct from the regioselective protonation of germacrene A (GA), resulting in distinct skeletons of 5/5/6 tricyclic (-)-cyperene and 6/6/5/3 tetracyclic ishwarane, respectively. Isotopic labeling experiments demonstrated that these protonations occur at C3 and C6 of GA in AhCS and AhIS, respectively. The cryo-electron microscopy-derived AhCS complex structure provided the structural basis for identifying different key active site residues that may govern their functional disparity. The structure-guided mutagenesis of these residues resulted in successful functional interconversion between AhCS and AhIS, thus targeting the three active site residues [L311-S419-C458]/[M311-V419-A458] that may act as a C3/C6 reprotonation switch for GA. These findings facilitate the rational design or directed evolution of STPSs with structurally diverse skeletons.
分子量: 24.305 Da / 分子数: 3 / 由来タイプ: 合成 / 式: Mg / タイプ: SUBJECT OF INVESTIGATION
研究の焦点であるリガンドがあるか
Y
-
実験情報
-
実験
実験
手法: 電子顕微鏡法
EM実験
試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法
-
試料調製
構成要素
名称: Complex of (-)-cyperene synthase with substrate anologue FSPP タイプ: COMPLEX / Entity ID: #1 / 由来: RECOMBINANT
分子量
実験値: NO
由来(天然)
生物種: Artabotrys hexapetalus (植物)
由来(組換発現)
生物種: Escherichia coli B (大腸菌)
緩衝液
pH: 7.5 詳細: 20 uL purified AhCS protein at the concentration of 3 mg/mL was incubated with 0.3uL FSPP (10 mg/mL) on ice for 2h and then the mixture was applied to prepare cryo-EM grids.
緩衝液成分
ID
濃度
名称
式
Buffer-ID
1
202.4
trimethylolaminomethanehydrochloride
Tris-HCl
1
2
502.9
sodiumchloride
NaCl
1
3
20.3
dithiothreitol
DTT
1
4
20.19
magnesiumchloride
MgCl2
1
試料
濃度: 3 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES