8CM0 | pdb_00008cm0

Rhs2-CT endonuclease toxin in complex with cognate immunity protein RhsI2

• PDB DOI: https://doi.org/10.2210/pdb8CM0/pdb

• Classification: ANTIMICROBIAL PROTEIN
• Organism(s): Serratia marcescens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2023-02-17 Released: 2024-08-28 
• Deposition Author(s): Pankov, G., Hunter, W.N., Coulthurst, S.J.
• Funding Organization(s): Wellcome Trust

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.17 Å
• R-Value Free: 
  0.253 (Depositor), 0.259 (DCC) 
• R-Value Work: 
  0.195 (Depositor), 0.201 (DCC) 

Starting Model: experimental

Literature

An Rhs effector uses distinct target cell functions to intoxicate bacterial and fungal competitors

Avelar, G.M., Pankov, G., Sarapa, T., Quinn, J., Hunter, W.N., Rickman, C., Coulthurst, S.J.

(2025) bioRxiv 

• DOI: https://doi.org/10.1101/2025.10.28.685041

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 36.72 kDa 
• Atom Count: 2,332 
• Modeled Residue Count: 273 
• Deposited Residue Count: 324 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Immunity protein RhsI2	A [auth B]	162	Serratia marcescens	Mutation(s): 0  Gene Names: FBF90_11815
UniProt
Find proteins for A0ABF7SXG6 (Serratia marcescens) Explore A0ABF7SXG6  Go to UniProtKB:  A0ABF7SXG6

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Rhs-family protein	B [auth A]	162	Serratia marcescens	Mutation(s): 0  Gene Names: SMDB11_1610
UniProt
Find proteins for A0ABC9II69 (Serratia marcescens subsp. marcescens Db11) Explore A0ABC9II69  Go to UniProtKB:  A0ABC9II69

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
EDO	C [auth B]	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N
ACT	D [auth A], E [auth A], F [auth A]	ACETATE ION C2 H3 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.17 Å
• R-Value Free:  0.253 (Depositor), 0.259 (DCC) 
• R-Value Work:  0.195 (Depositor), 0.201 (DCC) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 37.006	α = 90
b = 81.931	β = 90
c = 101.371	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data reduction
xia2	data scaling
PHASES	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2024-08-28 
Deposition Author(s): Pankov, G., Hunter, W.N., Coulthurst, S.J.

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Funding Organization	Location	Grant Number
Wellcome Trust	United Kingdom	215599/Z/19/Z
Wellcome Trust	United Kingdom	220321/Z/20/Z

Revision History  

• Version 1.0: 2024-08-28
  Type: Initial release
  
• Version 2.0: 2025-12-24
  Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Other, Polymer sequence, Source and taxonomy, Structure summary