9QXQ | pdb_00009qxq

native structure of full-length pesticidal protein Cry1Ca18 at pH9, from crystals formed in vivo

• PDB DOI: https://doi.org/10.2210/pdb9QXQ/pdb

• Classification: TOXIN
• Organism(s): Bacillus thuringiensis
• Mutation(s): No 


• Deposited: 2025-04-16 Released: 2026-02-11 
• Deposition Author(s): Best, H.L., Williamson, L.J., Rizkallah, P.J., Oberthur, D., Crickmore, N., Berry, C.
• Funding Organization(s): Biotechnology and Biological Sciences Research Council (BBSRC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.65 Å
• R-Value Free: 
  0.206 (Depositor), 0.213 (DCC) 
• R-Value Work: 
  0.178 (Depositor), 0.186 (DCC) 
• R-Value Observed: 
  0.179 (Depositor) 

Starting Model: experimental

Literature

native structure of full-length pesticidal protein Cry1Ca18 at pH9, from crystals formed in vivo

Best, H.L., Williamson, L.J., Rizkallah, P.J., Oberthur, D., Crickmore, N., Berry, C.

To be published.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 134.96 kDa 
• Atom Count: 9,526 
• Modeled Residue Count: 1,061 
• Deposited Residue Count: 1,189 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Crystaline entomocidal protoxin	A	1,189	Bacillus thuringiensis	Mutation(s): 0
UniProt
Find proteins for Q9L877 (Bacillus thuringiensis) Explore Q9L877  Go to UniProtKB:  Q9L877

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN (Subject of Investigation/LOI)	C [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
CA (Subject of Investigation/LOI)	B [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
CSO	A	L-PEPTIDE LINKING	C3 H7 N O3 S		CYS

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.65 Å
• R-Value Free:  0.206 (Depositor), 0.213 (DCC) 
• R-Value Work:  0.178 (Depositor), 0.186 (DCC) 
• R-Value Observed: 0.179 (Depositor) 

Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 88.8	α = 90
b = 88.8	β = 90
c = 267.82	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
CrystFEL	data scaling
PHASER	phasing
PDB_EXTRACT	data extraction
CrystFEL	data reduction

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2026-02-11 
Deposition Author(s): Best, H.L., Williamson, L.J., Rizkallah, P.J., Oberthur, D., Crickmore, N., Berry, C.

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Funding Organization	Location	Grant Number
Biotechnology and Biological Sciences Research Council (BBSRC)	United Kingdom	BB/S002774/1
Biotechnology and Biological Sciences Research Council (BBSRC)	United Kingdom	BB/M009122/1

Revision History  

• Version 1.0: 2026-02-11
  Type: Initial release