9H99 | pdb_00009h99

Native structure of the full-length pesticidal protein Cry1Ca18 at pH7, from crystals formed in vivo

• PDB DOI: https://doi.org/10.2210/pdb9H99/pdb

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


• Deposited: 2024-10-30 Released: 2025-11-12 
• Deposition Author(s): Best, H.L., Williamson, L.J., Rizkallah, P.J., Galchenkova, M., Oberthur, D., Crickmore, N., Berry, C.
• Funding Organization(s): Biotechnology and Biological Sciences Research Council (BBSRC)

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 
  0.222 (Depositor), 0.229 (DCC) 
• R-Value Work: 
  0.182 (Depositor), 0.189 (DCC) 
• R-Value Observed: 
  0.184 (Depositor) 

Starting Model: experimental

Literature

Structure of Cry1Ca18 pesticidal protein at pH 7

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

To be published.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 134.96 kDa 
• Atom Count: 9,318 
• Modeled Residue Count: 1,057 
• 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 Q6YNB8 (Bacillus thuringiensis) Explore Q6YNB8  Go to UniProtKB:  Q6YNB8

Small Molecules

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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free:  0.222 (Depositor), 0.229 (DCC) 
• R-Value Work:  0.182 (Depositor), 0.189 (DCC) 
• R-Value Observed: 0.184 (Depositor) 

Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 88.16	α = 90
b = 88.16	β = 90
c = 266.43	γ = 90

Software Package:

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

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-11-12 
Deposition Author(s): Best, H.L., Williamson, L.J., Rizkallah, P.J., Galchenkova, M., Oberthur, D., Crickmore, N., Berry, C.

---

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: 2025-11-12
  Type: Initial release