ジャーナル: Nat Commun / 年: 2020 タイトル: Pre-initiation and elongation structures of full-length La Crosse virus polymerase reveal functionally important conformational changes. 著者: Benoît Arragain / Grégory Effantin / Piotr Gerlach / Juan Reguera / Guy Schoehn / Stephen Cusack / Hélène Malet / 要旨: Bunyavirales is an order of segmented negative-strand RNA viruses comprising several life-threatening pathogens against which no effective treatment is currently available. Replication and ...Bunyavirales is an order of segmented negative-strand RNA viruses comprising several life-threatening pathogens against which no effective treatment is currently available. Replication and transcription of the RNA genome constitute essential processes performed by the virally encoded multi-domain RNA-dependent RNA polymerase. Here, we describe the complete high-resolution cryo-EM structure of La Crosse virus polymerase. It reveals the presence of key protruding C-terminal domains, notably the cap-binding domain, which undergoes large movements related to its role in transcription initiation, and a zinc-binding domain that displays a fold not previously observed. We capture the polymerase structure at pre-initiation and elongation states, uncovering the coordinated movement of the priming loop, mid-thumb ring linker and lid domain required for the establishment of a ten-base-pair template-product RNA duplex before strand separation into respective exit tunnels. These structural details and the observed dynamics of key functional elements will be instrumental for structure-based development of polymerase inhibitors.
分子量: 65.409 Da / 分子数: 2 / 由来タイプ: 合成 / 式: Zn / 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: X線回折 / 使用した結晶の数: 1
-
試料調製
結晶
マシュー密度: 5.42 Å3/Da / 溶媒含有率: 77.33 %
結晶化
温度: 277 K / 手法: 蒸気拡散法, ハンギングドロップ法 / pH: 8 詳細: LACV-L in complex with pre-annealed 3 prime (1-16) and 5 prime (9-16) vRNA was concentrated to 5 mg/ml. The 5 prime (1-10) vRNA end was later soaked into crystals in 1 to 2 molar ratio. ...詳細: LACV-L in complex with pre-annealed 3 prime (1-16) and 5 prime (9-16) vRNA was concentrated to 5 mg/ml. The 5 prime (1-10) vRNA end was later soaked into crystals in 1 to 2 molar ratio. Mother liquor was 100 mM Tris pH 8.0, 100 mM NaCl, and 8% PEG 4000. Crystals were soaked in a stepwise manner with increasing concentration of the glycerol cryo-protectant, reaching 30%
解像度: 3.961→209.891 Å / Cor.coef. Fo:Fc: 0.855 / Cor.coef. Fo:Fc free: 0.828 / SU B: 62.711 / SU ML: 0.824 / 交差検証法: FREE R-VALUE / ESU R Free: 1.092 / 詳細: Hydrogens have been added in their riding positions
Rfactor
反射数
%反射
Rfree
0.2988
1514
2.557 %
Rwork
0.2638
57697
-
all
0.265
-
-
obs
-
59211
60.786 %
溶媒の処理
イオンプローブ半径: 0.8 Å / 減衰半径: 0.8 Å / VDWプローブ半径: 1.2 Å / 溶媒モデル: MASK BULK SOLVENT
原子変位パラメータ
Biso mean: 189.756 Å2
Baniso -1
Baniso -2
Baniso -3
1-
2.243 Å2
0 Å2
-1.674 Å2
2-
-
1.232 Å2
0 Å2
3-
-
-
-1.22 Å2
精密化ステップ
サイクル: LAST / 解像度: 3.961→209.891 Å
タンパク質
核酸
リガンド
溶媒
全体
原子数
33204
1434
2
0
34640
拘束条件
Refine-ID
タイプ
Dev ideal
Dev ideal target
数
X-RAY DIFFRACTION
r_bond_refined_d
0.002
0.013
35476
X-RAY DIFFRACTION
r_bond_other_d
0.001
0.017
32445
X-RAY DIFFRACTION
r_ext_dist_refined_d
0.222
0.01
2315
X-RAY DIFFRACTION
r_angle_refined_deg
1.156
1.623
48135
X-RAY DIFFRACTION
r_angle_other_deg
1.041
1.607
75587
X-RAY DIFFRACTION
r_dihedral_angle_1_deg
5.017
5
4046
X-RAY DIFFRACTION
r_dihedral_angle_2_deg
32.954
23.012
1776
X-RAY DIFFRACTION
r_dihedral_angle_3_deg
17.299
15
6441
X-RAY DIFFRACTION
r_dihedral_angle_4_deg
11.115
15
180
X-RAY DIFFRACTION
r_chiral_restr
0.038
0.2
4769
X-RAY DIFFRACTION
r_gen_planes_refined
0.002
0.02
37770
X-RAY DIFFRACTION
r_gen_planes_other
0.001
0.02
7382
X-RAY DIFFRACTION
r_nbd_refined
0.17
0.2
6345
X-RAY DIFFRACTION
r_symmetry_nbd_other
0.172
0.2
29879
X-RAY DIFFRACTION
r_nbtor_refined
0.159
0.2
15876
X-RAY DIFFRACTION
r_symmetry_nbtor_other
0.074
0.2
16211
X-RAY DIFFRACTION
r_xyhbond_nbd_refined
0.15
0.2
452
X-RAY DIFFRACTION
r_symmetry_xyhbond_nbd_other
0.066
0.2
2
X-RAY DIFFRACTION
r_symmetry_nbd_refined
0.135
0.2
13
X-RAY DIFFRACTION
r_nbd_other
0.182
0.2
56
X-RAY DIFFRACTION
r_symmetry_xyhbond_nbd_refined
0.348
0.2
1
X-RAY DIFFRACTION
r_mcbond_it
6.307
20.32
16247
X-RAY DIFFRACTION
r_mcbond_other
6.304
20.32
16246
X-RAY DIFFRACTION
r_mcangle_it
11.064
30.456
20272
X-RAY DIFFRACTION
r_mcangle_other
11.064
30.456
20273
X-RAY DIFFRACTION
r_scbond_it
4.781
20.65
19229
X-RAY DIFFRACTION
r_scbond_other
4.781
20.65
19230
X-RAY DIFFRACTION
r_scangle_it
8.98
30.789
27863
X-RAY DIFFRACTION
r_scangle_other
8.98
30.789
27864
X-RAY DIFFRACTION
r_lrange_it
17.253
238.33
40160
X-RAY DIFFRACTION
r_lrange_other
17.253
238.327
40161
X-RAY DIFFRACTION
r_ncsr_local_group_1
0.005
0.05
1341
X-RAY DIFFRACTION
r_ncsr_local_group_2
0.039
0.05
66283
LS精密化 シェル
Refine-ID: X-RAY DIFFRACTION / Total num. of bins used: 20