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1ciy

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Revision as of 09:55, 10 September 2015

INSECTICIDAL TOXIN: STRUCTURE AND CHANNEL FORMATION

Structural highlights

1ciy is a 1 chain structure with sequence from "bacillus_cereus_var._thuringiensis"_smith_et_al._1952 "bacillus cereus var. thuringiensis" smith et al. 1952. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[CR1AA_BACTK] Promotes colloidosmotic lysis by binding to the midgut epithelial cells of many lepidopteran larvae.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

The activated 65 kDa lepidopteran-specific CryIA(a) toxin from the commercially most important strain Bacillus thuringiensis var. kurstaki HD-1 has been investigated by X-ray diffraction and for its ability to form channels in planar lipid bilayers. Its three-dimensional structure has been determined by a multiple isomorphous replacement method and refined at 2.25 A resolution to an R-factor of 0.168 for data with I > 2 delta (I). The toxin is made of three distinct domains. The N-terminal domain is a bundle of eight alpha-helices with the central, relatively hydrophobic helix surrounded by amphipathic helices. The middle and C-terminal domains contain mostly beta-sheets. Comparison with the structure of CryIIIA, a coleopteran-specific toxin, shows that although the fold of these two proteins is similar, there are significant structural differences within domain II. This finding supports the conclusions from genetic studies that domain II is involved in recognition and binding to cell surface receptors. The distribution of electrostatic potential on the surface of the molecule is non-uniform and identifies one side of the alpha-helical domain as negatively charged. The predominance of arginine residues as basic residues ensures that the observed positive charge distribution is also maintained in the highly alkaline environment found in the lepidopteran midgut. Structurally important salt bridges that are conserved across Cry sequences were identified and their possible role in toxin action was postulated. In planar lipid bilayers, CryIA(a) forms cation-selective channels, whose conductance is significantly smaller than that reported for CryIIIA but similar to those of other Cry toxins.

Bacillus thuringiensis CryIA(a) insecticidal toxin: crystal structure and channel formation.,Grochulski P, Masson L, Borisova S, Pusztai-Carey M, Schwartz JL, Brousseau R, Cygler M J Mol Biol. 1995 Dec 1;254(3):447-64. PMID:7490762^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Grochulski P, Masson L, Borisova S, Pusztai-Carey M, Schwartz JL, Brousseau R, Cygler M. Bacillus thuringiensis CryIA(a) insecticidal toxin: crystal structure and channel formation. J Mol Biol. 1995 Dec 1;254(3):447-64. PMID:7490762

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1ciy"

Categories: Bacillus cereus var. thuringiensis smith et al. 1952 | Cygler, M | Grochulski, P | Icp | Toxin

@@ Line 2: / Line 2: @@
 <StructureSection load='1ciy' size='340' side='right' caption='[[1ciy]], [[Resolution|resolution]] 2.25&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[1ciy]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Bacillus_thuringiensis Bacillus thuringiensis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CIY OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1CIY FirstGlance]. <br>
+<table><tr><td colspan='2'>[[1ciy]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_cereus_var._thuringiensis"_smith_et_al._1952 "bacillus cereus var. thuringiensis" smith et al. 1952]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CIY OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1CIY FirstGlance]. <br>
-</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ciy FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ciy OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1ciy RCSB], [http://www.ebi.ac.uk/pdbsum/1ciy PDBsum]</span></td></tr>
+</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ciy FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ciy OCA], [http://pdbe.org/1ciy PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1ciy RCSB], [http://www.ebi.ac.uk/pdbsum/1ciy PDBsum]</span></td></tr>
 </table>
 == Function ==
@@ Line 25: / Line 25: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 1ciy" style="background-color:#fffaf0;"></div>
 ==See Also==
@@ Line 32: / Line 33: @@
 __TOC__
 </StructureSection>
-[[Category: Bacillus thuringiensis]]
+[[Category: Bacillus cereus var. thuringiensis smith et al. 1952]]
 [[Category: Cygler, M]]
 [[Category: Grochulski, P]]
 [[Category: Icp]]
 [[Category: Toxin]]

1ciy

From Proteopedia

Revision as of 09:55, 10 September 2015

INSECTICIDAL TOXIN: STRUCTURE AND CHANNEL FORMATION

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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