8YQH

Crystal structure of Cry3Aa-PEI at 3.1 A

• PDB DOI: https://doi.org/10.2210/pdb8YQH/pdb

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


• Deposited: 2024-03-19 Released: 2025-02-12 
• Deposition Author(s): Li, J., Chan, M.K.
• Funding Organization(s): Other government

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.11 Å
• R-Value Free: 
  0.275 (Depositor), 0.274 (DCC) 
• R-Value Work: 
  0.193 (Depositor), 0.192 (DCC) 
• R-Value Observed: 
  0.197 (Depositor) 

Starting Model: experimental

Literature

Mechanoresponsive Protein Crystals for NADH Recycling in Multicycle Enzyme Reactions.

Yekta, R., Xiong, X., Li, J., Heater, B.S., Lee, M.M., Chan, M.K.

(2024) J Am Chem Soc 146: 18817-18822

• PubMed: 38968608 
• DOI: https://doi.org/10.1021/jacs.4c04725
• Primary Citation of Related Structures:  
  8YQH


• PubMed Abstract: 
  

  NAD(H)-dependent enzymes play a crucial role in the biosynthesis of pharmaceuticals and fine chemicals, but the limited recyclability of the NAD(H) cofactor hinders its more general application. Here, we report the generation of mechano-responsive PEI-modified Cry3Aa protein crystals and their use for NADH recycling over multiple reaction cycles. For demonstration of its practical utility, a complementary Cry3Aa protein particle containing genetically encoded and co-immobilized formate dehydrogenase for NADH regeneration and leucine dehydrogenase for catalyzing the NADH-dependent l- tert -leucine (l- tert -Leu) biosynthesis has been produced. When combined with the PEI-modified Cry3Aa crystal, the resultant reaction system could be used for the efficient biosynthesis of l- tert -Leu for up to 21 days with a 10.5-fold improvement in the NADH turnover number.

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Organizational Affiliation: 

School of Life Sciences & Center of Novel Biomaterials, The Chinese University of Hong Kong, Shatin, Hong Kong S.A.R. 999077.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 73.18 kDa 
• Atom Count: 4,701 
• Modelled Residue Count: 584 
• Deposited Residue Count: 644 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cry3Aa protein	A	644	Bacillus thuringiensis	Mutation(s): 0  Gene Names: cry3Aa, EEL55_22485
UniProt
Find proteins for Q9S6N9 (Bacillus thuringiensis) Explore Q9S6N9  Go to UniProtKB:  Q9S6N9

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.11 Å
• R-Value Free:  0.275 (Depositor), 0.274 (DCC) 
• R-Value Work:  0.193 (Depositor), 0.192 (DCC) 
• R-Value Observed: 0.197 (Depositor) 

Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 115.846	α = 90
b = 133.368	β = 90
c = 105.798	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-02-12 
Deposition Author(s): Li, J., Chan, M.K.

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Funding Organization	Location	Grant Number
Other government	Hong Kong	CUHK Idea Booster Fund IDBF23SCI18
Other government	Hong Kong	Hong Kong Research Grants Council GRF 14323216

Revision History  

• Version 1.0: 2025-02-12
  Type: Initial release