1JI6

CRYSTAL STRUCTURE OF THE INSECTICIDAL BACTERIAL DEL ENDOTOXIN CRY3Bb1 BACILLUS THURINGIENSIS

DOI: 10.2210/pdb1JI6/pdb

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

Deposited: 2001-06-29 Released: 2001-09-19
Deposition Author(s): Cody, V.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.40 Å
R-Value Free: 0.253
R-Value Work: 0.175
R-Value Observed: 0.175

wwPDB Validation 3D Report Full Report

This is version 1.3 of the entry. See complete history.

Literature

Structure of the insecticidal bacterial delta-endotoxin Cry3Bb1 of Bacillus thuringiensis.

Galitsky, N., Cody, V., Wojtczak, A., Ghosh, D., Luft, J.R., Pangborn, W., English, L.

(2001) Acta Crystallogr D Biol Crystallogr 57: 1101-1109

PubMed: 11468393 Search on PubMed
DOI: 10.1107/s0907444901008186
Primary Citation of Related Structures:
1JI6

PubMed Abstract:

The coleopteran-active delta-endotoxin Cry3Bb1 from Bacillus thuringiensis (Bt) strain EG7231 is uniquely toxic to Diabrotica undecimpunctata, the Southern corn rootworm, while retaining activity against Leptinotarsa decemlineata, the Colorado potato beetle. The crystal structure of the delta-endotoxin Cry3Bb1 has been refined using data collected to 2.4 A resolution, with a residual R factor of 17.5% and an R(free) of 25.3%. The structure is made up of three domains: I, a seven-helix bundle (residues 64-294); II, a three-sheet domain (residues 295-502); and III, a beta-sandwich domain (residues 503-652). The monomers in the orthorhombic C222(1) crystal lattice form a dimeric quaternary structure across a crystallographic twofold axis, with a channel formed involving interactions between domains I and III. There are 23 hydrogen bonds between the two monomers conferring structural stability on the dimer. It has been demonstrated that Cry3Bb1 and the similar toxin Cry3A form oligomers in solution. The structural results presented here indicate that the interactions between domains I and III could be responsible for the initial higher order structure and have implications for the biological activity of these toxins. There are seven additional single amino-acid residues in the sequence of Cry3Bb1 compared with that of Cry3A; one in domain I, two in domain II and four in domain III, which also shows the largest conformational difference between the two proteins. These changes can be implicated in the selectivity differences noted for these two delta-endotoxins.

Related Citations:

Crystal Structure of Insecticidal Delta-Endotoxin from Bacillus Thuringiensis at 2.5 Angstroms Resolution
Li, J., Carroll, J., Ellar, D.J.
(1991) Nature 353: 815

X-Ray Analysis of the Crystalline Parasporal Inclusion in Bacillus Thuringiensis Var. Tenebrionis
Li, J., Henderson, R., Carroll, J., Ellar, D.
(1988) J Mol Biol 199: 543

Organizational Affiliation:

Hauptman-Woodward Research Institute, Inc., 73 High Street, Buffalo, NY 14203-1196, USA.

Macromolecules

Find similar proteins by:

(by identity cutoff) | Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PESTICIDIAL CRYSTAL PROTEIN CRY3BB	A	589	Bacillus thuringiensis	Mutation(s): 0 Gene Names: cry3Bb, cryIIIB(b), cryIIIb2
UniProt
Find proteins for Q06117 (Bacillus thuringiensis) Explore Q06117 Go to UniProtKB: Q06117
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Reference Sequence