7A8R | pdb_00007a8r

Structure of RecQL from Bos taurus

• PDB DOI: https://doi.org/10.2210/pdb7A8R/pdb

• Classification: RECOMBINATION
• Organism(s): Bos taurus
• Expression System: Escherichia coli 'BL21-Gold(DE3)pLysS AG
• Mutation(s): No 


• Deposited: 2020-08-30 Released: 2021-10-06 
• Deposition Author(s): Rety, S., Chen, W.F., Xi, X.G.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.31 Å
• R-Value Free: 
  0.253 (Depositor), 0.255 (DCC) 
• R-Value Work: 
  0.201 (Depositor), 0.202 (DCC) 
• R-Value Observed: 
  0.204 (Depositor) 

Starting Model: experimental

Literature

Endogenous Bos taurus RECQL is predominantly monomeric and more active than oligomers.

Liu, N.N., Song, Z.Y., Guo, H.L., Yin, H., Chen, W.F., Dai, Y.X., Xin, B.G., Ai, X., Ji, L., Wang, Q.M., Hou, X.M., Dou, S.X., Rety, S., Xi, X.G.

(2021) Cell Rep 36: 109688-109688

• PubMed: 34496242 
• DOI: https://doi.org/10.1016/j.celrep.2021.109688
• Primary Citation Related Structures: 
  7A8R


• PubMed Abstract: 
  

  There is broad consensus that RecQ family helicase is a high-order oligomer that dissociates into a dimer upon ATP binding. This conclusion is based mainly on studies of highly purified recombinant proteins, and the oligomeric states of RecQ helicases in living cells remain unknown. We show here that, in contrast to current models, monomeric RECQL helicase is more abundant than oligomer/dimer forms in living cells. Further characterization of endogenous BtRECQL and isolated monomeric BtRECQL using various approaches demonstrates that both endogenous and recombinant monomeric BtRECQL effectively function as monomers, displaying higher helicase and ATPase activities than dimers and oligomers. Furthermore, monomeric BtRECQL unfolds intramolecular G-quadruplex DNA as efficiently as human RECQL and BLM helicases. These discoveries have implications for understanding endogenous RECQL oligomeric structures and their regulation. It is worth revisiting oligomeric states of the other members of the RecQ family helicases in living cells.

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Organizational Affiliation: 
• State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China.
Beijing National Laboratory for Condensed Matter Physics and CAS Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
Univ. Lyon, ENS de Lyon, Univ. Claude Bernard, CNRS UMR 5239, INSERM U1210, LBMC, 46 allée d'Italie Site Jacques Monod, F-69007, Lyon, France.
State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China; LBPA, Ecole Normale Supérieure Paris-Saclay, CNRS, Université Paris Saclay, Gif-sur-Yvette, France. Electronic address: [e-mail].

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: SAXS

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 122.14 kDa 
• Atom Count: 8,618 
• Modeled Residue Count: 1,061 
• Deposited Residue Count: 1,062 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ATP-dependent DNA helicase	A, B	531	Bos taurus	Mutation(s): 0  Gene Names: RECQL EC: 3.6.4.12 (PDB Primary Data), 5.6.2.4 (UniProt)
UniProt
Find proteins for A0JN36 (Bos taurus) Explore A0JN36  Go to UniProtKB:  A0JN36

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ADP (Subject of Investigation/LOI)	D [auth A], G [auth B]	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N
ZN (Subject of Investigation/LOI)	C [auth A], F [auth B]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
MG	E [auth A], H [auth B]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.31 Å
• R-Value Free:  0.253 (Depositor), 0.255 (DCC) 
• R-Value Work:  0.201 (Depositor), 0.202 (DCC) 
• R-Value Observed: 0.204 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 55.576	α = 90
b = 117.224	β = 90
c = 203.819	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
Aimless	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2021-10-06 
Deposition Author(s): Rety, S., Chen, W.F., Xi, X.G.

Revision History  

• Version 1.0: 2021-10-06
  Type: Initial release
  
• Version 1.1: 2024-01-31
  Changes: Data collection, Refinement description