ジャーナル: Structure / 年: 2023 タイトル: Structural characterization of human tryptophan hydroxylase 2 reveals that L-Phe is superior to L-Trp as the regulatory domain ligand. 著者: Ida M Vedel / Andreas Prestel / Zhenwei Zhang / Natalia T Skawinska / Holger Stark / Pernille Harris / Birthe B Kragelund / Günther H J Peters / 要旨: Tryptophan hydroxylase 2 (TPH2) catalyzes the rate-limiting step in serotonin biosynthesis in the brain. Consequently, regulation of TPH2 is relevant for serotonin-related diseases, yet the ...Tryptophan hydroxylase 2 (TPH2) catalyzes the rate-limiting step in serotonin biosynthesis in the brain. Consequently, regulation of TPH2 is relevant for serotonin-related diseases, yet the regulatory mechanism of TPH2 is poorly understood and structural and dynamical insights are missing. We use NMR spectroscopy to determine the structure of a 47 N-terminally truncated variant of the regulatory domain (RD) dimer of human TPH2 in complex with L-Phe, and show that L-Phe is the superior RD ligand compared with the natural substrate, L-Trp. Using cryo-EM, we obtain a low-resolution structure of a similarly truncated variant of the complete tetrameric enzyme with dimerized RDs. The cryo-EM two-dimensional (2D) class averages additionally indicate that the RDs are dynamic in the tetramer and likely exist in a monomer-dimer equilibrium. Our results provide structural information on the RD as an isolated domain and in the TPH2 tetramer, which will facilitate future elucidation of TPH2's regulatory mechanism.
1.1 mM [U-99% 13C; U-99% 15N] Tryptophan hydroxylase 2 (GP+ 48 to 145), 10 mM L-Phe, 20 mM sodium phosphate, 100 mM ammonium sulfate, 125 uM DSS, 95% H2O/5% D2O
Protein
95% H2O/5% D2O
solution
2
0.45 mM Tryptophan hydroxylase 2 (GP+ 48 to 145), 2.6 mM [U-13C; U-15N] L-Phe, 20 mM sodium phosphate, 100 mM ammonium sulfate, 125 uM DSS, 95% H2O/5% D2O
L-Phe
95% H2O/5% D2O
試料
濃度 (mg/ml)
構成要素
Isotopic labeling
Solution-ID
1.1mM
Tryptophanhydroxylase2 (GP+ 48to145)
[U-99% 13C; U-99% 15N]
1
10mM
L-Phe
none
1
20mM
sodiumphosphate
none
1
100mM
ammoniumsulfate
none
1
125uM
DSS
none
1
0.45mM
Tryptophanhydroxylase2 (GP+ 48to145)
none
2
2.6mM
L-Phe
[U-13C; U-15N]
2
20mM
sodiumphosphate
none
2
100mM
ammoniumsulfate
none
2
125uM
DSS
none
2
試料状態
イオン強度: 0.344 M / Label: Standard / pH: 7.0 / 圧: 1 atm / 温度: 303 K
-
NMR測定
NMRスペクトロメーター
タイプ
製造業者
モデル
磁場強度 (MHz)
Spectrometer-ID
Bruker AVANCE III
Bruker
AVANCEIII
750
1
Bruker AVANCE III
Bruker
AVANCEIII
600
2
-
解析
NMR software
名称
バージョン
開発者
分類
X-PLOR NIH
2.44
Schwieters, Kuszewski, TjandraandClore
精密化
CYANA
3.98.5
Guntert, MumenthalerandWuthrich
structurecalculation
CcpNmr Analysis
2.4.2
CCPN
chemicalshiftassignment
CcpNmr Analysis
2.4.2
CCPN
peakpicking
NMRPipe
Delaglio, Grzesiek, Vuister, Zhu, PfeiferandBax
解析
TopSpin
3.5
BrukerBiospin
解析
qMDD
Kazimierczuk, Orekhov
解析
TALOS
Cornilescu, DelaglioandBax
データ解析
精密化
手法: simulated annealing / ソフトェア番号: 1
代表構造
選択基準: lowest energy
NMRアンサンブル
コンフォーマー選択の基準: structures with the lowest energy 計算したコンフォーマーの数: 100 / 登録したコンフォーマーの数: 20