ジャーナル: Nucleic Acids Res / 年: 2023 タイトル: Structural insights into the DNA recognition mechanism by the bacterial transcription factor PdxR. 著者: Ida Freda / Cécile Exertier / Anna Barile / Antonio Chaves-Sanjuan / Mirella Vivoli Vega / Michail N Isupov / Nicholas J Harmer / Elena Gugole / Paolo Swuec / Martino Bolognesi / Anita ...著者: Ida Freda / Cécile Exertier / Anna Barile / Antonio Chaves-Sanjuan / Mirella Vivoli Vega / Michail N Isupov / Nicholas J Harmer / Elena Gugole / Paolo Swuec / Martino Bolognesi / Anita Scipioni / Carmelinda Savino / Martino Luigi Di Salvo / Roberto Contestabile / Beatrice Vallone / Angela Tramonti / Linda Celeste Montemiglio / 要旨: Specificity in protein-DNA recognition arises from the synergy of several factors that stem from the structural and chemical signatures encoded within the targeted DNA molecule. Here, we deciphered ...Specificity in protein-DNA recognition arises from the synergy of several factors that stem from the structural and chemical signatures encoded within the targeted DNA molecule. Here, we deciphered the nature of the interactions driving DNA recognition and binding by the bacterial transcription factor PdxR, a member of the MocR family responsible for the regulation of pyridoxal 5'-phosphate (PLP) biosynthesis. Single particle cryo-EM performed on the PLP-PdxR bound to its target DNA enabled the isolation of three conformers of the complex, which may be considered as snapshots of the binding process. Moreover, the resolution of an apo-PdxR crystallographic structure provided a detailed description of the transition of the effector domain to the holo-PdxR form triggered by the binding of the PLP effector molecule. Binding analyses of mutated DNA sequences using both wild type and PdxR variants revealed a central role of electrostatic interactions and of the intrinsic asymmetric bending of the DNA in allosterically guiding the holo-PdxR-DNA recognition process, from the first encounter through the fully bound state. Our results detail the structure and dynamics of the PdxR-DNA complex, clarifying the mechanism governing the DNA-binding mode of the holo-PdxR and the regulation features of the MocR family of transcription factors.
AAA: PLP-dependent aminotransferase family protein BBB: PLP-dependent aminotransferase family protein CCC: PLP-dependent aminotransferase family protein DDD: PLP-dependent aminotransferase family protein EEE: PLP-dependent aminotransferase family protein FFF: PLP-dependent aminotransferase family protein GGG: PLP-dependent aminotransferase family protein HHH: PLP-dependent aminotransferase family protein III: PLP-dependent aminotransferase family protein JJJ: PLP-dependent aminotransferase family protein KKK: PLP-dependent aminotransferase family protein ヘテロ分子
AAA: PLP-dependent aminotransferase family protein BBB: PLP-dependent aminotransferase family protein ヘテロ分子
登録者・ソフトウェアが定義した集合体
根拠: gel filtration, Monomers A and B, C and D, E and F, G and H form dimers in the asymmetric unit, monomers I and J form dimers with their crystallographic dyad counterparts. Monomer K is the ...根拠: gel filtration, Monomers A and B, C and D, E and F, G and H form dimers in the asymmetric unit, monomers I and J form dimers with their crystallographic dyad counterparts. Monomer K is the only well defined N-terminal domain out of 10 present in the xtal, not clear which monomer out of 10 it belongs to.
111 kDa, 2 ポリマー
分子量 (理論値)
分子数
合計 (水以外)
110,773
8
ポリマ-
110,542
2
非ポリマー
231
6
水
36
2
タイプ
名称
対称操作
数
identity operation
1_555
x,y,z
1
Buried area
5100 Å2
ΔGint
-81 kcal/mol
Surface area
29000 Å2
手法
PISA
2
CCC: PLP-dependent aminotransferase family protein DDD: PLP-dependent aminotransferase family protein ヘテロ分子
登録者・ソフトウェアが定義した集合体
111 kDa, 2 ポリマー
分子量 (理論値)
分子数
合計 (水以外)
110,782
8
ポリマ-
110,542
2
非ポリマー
240
6
水
36
2
タイプ
名称
対称操作
数
identity operation
1_555
x,y,z
1
Buried area
5180 Å2
ΔGint
-95 kcal/mol
Surface area
29030 Å2
手法
PISA
3
EEE: PLP-dependent aminotransferase family protein FFF: PLP-dependent aminotransferase family protein ヘテロ分子
登録者・ソフトウェアが定義した集合体
111 kDa, 2 ポリマー
分子量 (理論値)
分子数
合計 (水以外)
110,812
6
ポリマ-
110,542
2
非ポリマー
270
4
水
36
2
タイプ
名称
対称操作
数
identity operation
1_555
x,y,z
1
Buried area
5200 Å2
ΔGint
-65 kcal/mol
Surface area
29170 Å2
手法
PISA
4
GGG: PLP-dependent aminotransferase family protein HHH: PLP-dependent aminotransferase family protein ヘテロ分子
登録者・ソフトウェアが定義した集合体
111 kDa, 2 ポリマー
分子量 (理論値)
分子数
合計 (水以外)
111,233
11
ポリマ-
110,542
2
非ポリマー
691
9
水
36
2
タイプ
名称
対称操作
数
identity operation
1_555
x,y,z
1
Buried area
5450 Å2
ΔGint
-87 kcal/mol
Surface area
28990 Å2
手法
PISA
5
III: PLP-dependent aminotransferase family protein ヘテロ分子
III: PLP-dependent aminotransferase family protein ヘテロ分子
登録者・ソフトウェアが定義した集合体
111 kDa, 2 ポリマー
分子量 (理論値)
分子数
合計 (水以外)
110,782
8
ポリマ-
110,542
2
非ポリマー
240
6
水
36
2
タイプ
名称
対称操作
数
identity operation
1_555
x,y,z
1
crystal symmetry operation
8_675
x-y+1,-y+2,-z
1
Buried area
5010 Å2
ΔGint
-99 kcal/mol
Surface area
29130 Å2
手法
PISA
6
JJJ: PLP-dependent aminotransferase family protein ヘテロ分子
JJJ: PLP-dependent aminotransferase family protein ヘテロ分子
登録者・ソフトウェアが定義した集合体
111 kDa, 2 ポリマー
分子量 (理論値)
分子数
合計 (水以外)
110,773
8
ポリマ-
110,542
2
非ポリマー
231
6
水
36
2
タイプ
名称
対称操作
数
identity operation
1_555
x,y,z
1
crystal symmetry operation
12_565
x,x-y+1,-z+1/6
1
Buried area
5010 Å2
ΔGint
-76 kcal/mol
Surface area
28590 Å2
手法
PISA
7
KKK: PLP-dependent aminotransferase family protein ヘテロ分子