ジャーナル: Nat Commun / 年: 2023 タイトル: DNA-binding mechanism and evolution of replication protein A. 著者: Clément Madru / Markel Martínez-Carranza / Sébastien Laurent / Alessandra C Alberti / Maelenn Chevreuil / Bertrand Raynal / Ahmed Haouz / Rémy A Le Meur / Marc Delarue / Ghislaine Henneke ...著者: Clément Madru / Markel Martínez-Carranza / Sébastien Laurent / Alessandra C Alberti / Maelenn Chevreuil / Bertrand Raynal / Ahmed Haouz / Rémy A Le Meur / Marc Delarue / Ghislaine Henneke / Didier Flament / Mart Krupovic / Pierre Legrand / Ludovic Sauguet / 要旨: Replication Protein A (RPA) is a heterotrimeric single stranded DNA-binding protein with essential roles in DNA replication, recombination and repair. Little is known about the structure of RPA in ...Replication Protein A (RPA) is a heterotrimeric single stranded DNA-binding protein with essential roles in DNA replication, recombination and repair. Little is known about the structure of RPA in Archaea, the third domain of life. By using an integrative structural, biochemical and biophysical approach, we extensively characterize RPA from Pyrococcus abyssi in the presence and absence of DNA. The obtained X-ray and cryo-EM structures reveal that the trimerization core and interactions promoting RPA clustering on ssDNA are shared between archaea and eukaryotes. However, we also identified a helical domain named AROD (Acidic Rpa1 OB-binding Domain), and showed that, in Archaea, RPA forms an unanticipated tetrameric supercomplex in the absence of DNA. The four RPA molecules clustered within the tetramer could efficiently coat and protect stretches of ssDNA created by the advancing replisome. Finally, our results provide insights into the evolution of this primordial replication factor in eukaryotes.
構造決定の手法: 分子置換 開始モデル: Working model of the full RPA 解像度: 1.8→32.25 Å / Cor.coef. Fo:Fc: 0.956 / Cor.coef. Fo:Fc free: 0.95 / SU R Cruickshank DPI: 0.138 / 交差検証法: THROUGHOUT / SU R Blow DPI: 0.142 / SU Rfree Blow DPI: 0.124 / SU Rfree Cruickshank DPI: 0.123
Rfactor
反射数
%反射
Selection details
Rfree
0.2284
1857
4.92 %
RANDOM
Rwork
0.2086
-
-
-
obs
0.2095
37716
92.4 %
-
原子変位パラメータ
Biso mean: 39.74 Å2
Baniso -1
Baniso -2
Baniso -3
1-
-0.0597 Å2
0 Å2
0.4556 Å2
2-
-
-1.2775 Å2
0 Å2
3-
-
-
1.3372 Å2
Refine analyze
Luzzati coordinate error obs: 0.26 Å
精密化ステップ
サイクル: LAST / 解像度: 1.8→32.25 Å
タンパク質
核酸
リガンド
溶媒
全体
原子数
2860
0
8
290
3158
拘束条件
Refine-ID
タイプ
Dev ideal
数
Restraint function
Weight
X-RAY DIFFRACTION
t_bond_d
0.008
2967
HARMONIC
2
X-RAY DIFFRACTION
t_angle_deg
0.95
4012
HARMONIC
2
X-RAY DIFFRACTION
t_dihedral_angle_d
1127
SINUSOIDAL
2
X-RAY DIFFRACTION
t_gen_planes
501
HARMONIC
5
X-RAY DIFFRACTION
t_it
2967
HARMONIC
10
X-RAY DIFFRACTION
t_chiral_improper_torsion
384
SEMIHARMONIC
5
X-RAY DIFFRACTION
t_sum_occupancies
4
HARMONIC
1
X-RAY DIFFRACTION
t_ideal_dist_contact
2914
SEMIHARMONIC
4
X-RAY DIFFRACTION
t_omega_torsion
3.49
X-RAY DIFFRACTION
t_other_torsion
14.32
LS精密化 シェル
解像度: 1.8→1.83 Å
Rfactor
反射数
%反射
Rfree
0.3423
26
3.4 %
Rwork
0.3088
729
-
obs
-
-
36.75 %
精密化 TLS
Origin x: 27.171 Å / Origin y: 45.6439 Å / Origin z: 0.8697 Å