8W7N image
Entry Detail
PDB ID:
8W7N
Keywords:
Title:
Crystal structure of the in-cell Cry1Aa purified from Bacillus thuringiensis
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2023-08-31
Release Date:
2024-03-06
Method Details:
Experimental Method:
Resolution:
3.60 Å
R-Value Free:
0.31
R-Value Work:
0.21
R-Value Observed:
0.22
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Pesticidal crystal protein Cry1Aa
Chain IDs:A
Chain Length:1144
Number of Molecules:1
Biological Source:Bacillus thuringiensis
Ligand Molecules
Primary Citation
Crystal structure of the in-cell Cry1Aa purified from Bacillus thuringiensis.
Biochem.Biophys.Res.Commun. 685 149144 149144 (2023)
PMID: 37922785 DOI: 10.1016/j.bbrc.2023.149144

Abstact

In-cell protein crystals which spontaneously crystallize in living cells, have recently been analyzed in investigations of their structures and biological functions. The crystals have been challenging to analyze structurally because of their small size. Therefore, the number of in-cell protein crystals in which the native structure has been determined is limited because most of the structures of in-cell crystals have been determined by recrystallization after dissolution. Some proteins have been reported to form intermolecular disulfide bonds in natural protein crystals that stabilize the crystals. Here, we focus on Cry1Aa, a cysteine-rich protein that crystallizes in Bacillus thuringiensis (Bt) and forms disulfide bonds. Previously, the full-length structure of 135 kDa Cry1Ac, which is the same size as Cry1Aa, was determined by recrystallization of dissolved protein from crystals purified from Bt cells. However, the formation of disulfide bonds has not been investigated because it was necessary to replace cysteine residues to prevent aggregation of the soluble protein. In this work, we succeeded in direct X-ray crystallographic analysis using crystals purified from Bt cells and characterized the cross-linked network of disulfide bonds within Cry1Aa crystals.

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