6LFP

Cry3Aa protein for enzyme entrapment

• PDB DOI: https://doi.org/10.2210/pdb6LFP/pdb

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


• Deposited: 2019-12-03 Released: 2020-10-14 
• Deposition Author(s): Heater, B.S., Chan, M.K.
• Funding Organization(s): The University Grants Committee, Research Grants Council (RGC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.31 Å
• R-Value Free: 
  0.209 (Depositor), 0.210 (DCC) 
• R-Value Work: 
  0.157 (Depositor), 0.160 (DCC) 
• R-Value Observed: 
  0.159 (Depositor) 

Starting Model: experimental

Literature

In Vivo Enzyme Entrapment in a Protein Crystal.

Heater, B.S., Yang, Z., Lee, M.M., Chan, M.K.

(2020) J Am Chem Soc 142: 9879-9883

• PubMed: 32407637 
• DOI: https://doi.org/10.1021/jacs.9b13462
• Primary Citation of Related Structures:  
  6LFP


• PubMed Abstract: 
  

  Cry3Aa is a protein that forms crystals naturally in the bacterium Bacillus thuringiensis . Here we report that coexpression of Cry3Aa and a Proteus mirabilis lipase without recombinant fusion results in the efficient passive entrapment of the lipase within the nanoporous channels of the resulting crystals. This Cry3Aa crystal-mediated entrapment provides multiple benefits to the lipase including a high enzyme loading, significantly improved thermostability, increased proteolytic resistance, and the ability to be utilized as a recyclable biodiesel catalyst. These characteristics, along with its greatly simplified method of isolation, highlight the potential of Cry3Aa crystal-mediated enzyme entrapment for use in biocatalysis and other biotechnological applications.

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Organizational Affiliation: 

School of Life Sciences & Center of Novel Biomaterials, The Chinese University of Hong Kong, Hong Kong, SAR, China.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 73.18 kDa 
• Atom Count: 4,676 
• Modelled Residue Count: 582 
• 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 P0A381 (Bacillus thuringiensis subsp. san diego) Explore P0A381  Go to UniProtKB:  P0A381

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.31 Å
• R-Value Free:  0.209 (Depositor), 0.210 (DCC) 
• R-Value Work:  0.157 (Depositor), 0.160 (DCC) 
• R-Value Observed: 0.159 (Depositor) 

Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 116.35	α = 90
b = 132.61	β = 90
c = 102.89	γ = 90

Software Package:

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

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2020-10-14 
Deposition Author(s): Heater, B.S., Chan, M.K.

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Funding Organization	Location	Grant Number
The University Grants Committee, Research Grants Council (RGC)	Hong Kong	14323219
The University Grants Committee, Research Grants Council (RGC)	Hong Kong	14323216

Revision History  

• Version 1.0: 2020-10-14
  Type: Initial release
  
• Version 1.1: 2023-11-22
  Changes: Data collection, Database references, Refinement description