9QQ9 | pdb_00009qq9

Crystal structure of the relaxase domain of RelpLS20, prototype of MobL family of relaxases

PDB DOI: https://doi.org/10.2210/pdb9QQ9/pdb

Classification: DNA BINDING PROTEIN
Organism(s): Bacillus subtilis subsp. natto
Expression System: Escherichia coli 'BL21-Gold(DE3)pLysS AG
Mutation(s): No

Deposited: 2025-03-31 Released: 2026-04-15
Deposition Author(s): Crespo, I., Boer, D.R.
Funding Organization(s): Spanish Ministry of Economy and Competitiveness

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.66 Å
R-Value Free:
0.199 (Depositor), 0.198 (DCC)
R-Value Work:
0.172 (Depositor), 0.172 (DCC)
R-Value Observed:
0.173 (Depositor)

Starting Model: experimental
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This is version 1.0 of the entry. See complete history.

Literature

Crystal structure of the relaxase domain of RelpLS20, prototype of MobL family of relaxases

Crespo, I., Boer, D.R.

To be published.

Macromolecule Content

Total Structure Weight: 27.07 kDa
Atom Count: 1,968
Modeled Residue Count: 219
Deposited Residue Count: 234
Unique protein chains: 1

Macromolecules

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Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Relaxase	A	234	Bacillus subtilis subsp. natto	Mutation(s): 0
UniProt
Find proteins for E9RJ23 (Bacillus subtilis subsp. natto) Explore E9RJ23 Go to UniProtKB: E9RJ23
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	E9RJ23
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
CL Query on CL Download:Ideal Coordinates CCD File SDF format, chain B [auth A] SDF format, chain C [auth A] SDF format, chain D [auth A] MOL2 format, chain B [auth A] MOL2 format, chain C [auth A] MOL2 format, chain D [auth A] mmCIF format, chain B [auth A] mmCIF format, chain C [auth A] mmCIF format, chain D [auth A]	B [auth A], C [auth A], D [auth A]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M		Interactions Focus chain B [auth A] Focus chain C [auth A] Focus chain D [auth A] Interactions & Density Focus chain B [auth A] Focus chain C [auth A] Focus chain D [auth A]

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 1.66 Å
R-Value Free: 0.199 (Depositor), 0.198 (DCC)
R-Value Work: 0.172 (Depositor), 0.172 (DCC)
R-Value Observed: 0.173 (Depositor)

Space Group: P 6₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 100.918	α = 90
b = 100.918	β = 90
c = 58.875	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement
XSCALE	data scaling
PHENIX	phasing
XDS	data reduction

Structure Validation

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Entry History

& Funding Information

Deposition Data

Released Date: 2026-04-15

Deposition Author(s):

Funding Organization	Location	Grant Number
Spanish Ministry of Economy and Competitiveness	Spain	BIO2016-77883-C2-2-P
Spanish Ministry of Economy and Competitiveness	Spain	FIS2015-72574-EXP

Revision History (Full details and data files)

Version 1.0: 2026-04-15
Type: Initial release

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RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.