ジャーナル: ACS Cent Sci / 年: 2021 タイトル: A Structural Ensemble of a Tau-Microtubule Complex Reveals Regulatory Tau Phosphorylation and Acetylation Mechanisms. 著者: Z Faidon Brotzakis / Philip R Lindstedt / Ross J Taylor / Dillon J Rinauro / Nicholas C T Gallagher / Gonçalo J L Bernardes / Michele Vendruscolo / 要旨: Tau is a microtubule-associated protein that regulates the stability of microtubules. We use metainference cryoelectron microscopy, an integrative structural biology approach, to determine an ...Tau is a microtubule-associated protein that regulates the stability of microtubules. We use metainference cryoelectron microscopy, an integrative structural biology approach, to determine an ensemble of conformations representing the structure and dynamics of a tau-microtubule complex comprising the entire microtubule-binding region of tau (residues 202-395). We thus identify the ground state of the complex and a series of excited states of lower populations. A comparison of the interactions in these different states reveals positions along the tau sequence that are important to determine the overall stability of the tau-microtubule complex. This analysis leads to the identification of positions where phosphorylation and acetylation events have destabilizing effects, which we validate by using site-specific post-translationally modified tau variants obtained by chemical mutagenesis. Taken together, these results illustrate how the simultaneous determination of ground and excited states of macromolecular complexes reveals functional and regulatory mechanisms.
分子量: 24.305 Da / 分子数: 7 / 由来タイプ: 合成 / 式: Mg / タイプ: SUBJECT OF INVESTIGATION
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詳細
研究の焦点であるリガンドがあるか
Y
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実験情報
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実験
実験
手法: 電子顕微鏡法
EM実験
試料の集合状態: FILAMENT / 3次元再構成法: 単粒子再構成法
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試料調製
構成要素
ID
名称
タイプ
詳細
Entity ID
Parent-ID
由来
1
Ternary complex of alpha-beta tubulin with wildtype (full-length) tau
COMPLEX
Sample preparation Specimen Specimen State=Filament Method= cryo EM Helical Parameters Axial Symmetry= C1 (asymmetric) Delta Z=8.63 A Delta Phi=-25.75 %deg Specimen conc.= 0.5 mg/mL pH=6.8 Support film unspecified Vitrification Instrument=FEI VITROBOT MARK IV Cryogen Name= ETHANE Temperature= 310.15 K Humidity= 100 % Details= blot force 10 pN, 6 second blot time. used C-flat 1.2/1.3 holey grids. First 2 uL of microtubules were adhered to grid for 30 seconds, followed by 2 4 uL washes with 30 second incubation for each wash.
#1-#3
0
RECOMBINANT
2
Tubulin
COMPLEX
#1-#2
1
RECOMBINANT
3
Isoform Tau-F of Microtubule-associated protein tau
COMPLEX
#3
1
RECOMBINANT
由来(天然)
ID
Entity assembly-ID
生物種
Ncbi tax-ID
1
2
Sus scrofa (ブタ)
9823
2
3
Homo sapiens (ヒト)
9606
由来(組換発現)
ID
Entity assembly-ID
生物種
Ncbi tax-ID
1
2
Escherichia coli (大腸菌)
562
2
3
Escherichia coli (大腸菌)
562
緩衝液
pH: 6.8
試料
濃度: 0.5 mg/ml / 包埋: NO / シャドウイング: NO / 染色: YES / 凍結: YES
電子線照射量: 27.5 e/Å2 フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k)
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解析
CTF補正
詳細: Images were drift-corrected using UCSF motioncorr software . CTFFIND4 was used to estimate CTFs for the drift-corrected images タイプ: PHASE FLIPPING ONLY
3次元再構成
解像度: 4.1 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 25963 / 対称性のタイプ: POINT