1x99
From Proteopedia
(New page: 200px<br /><applet load="1x99" size="450" color="white" frame="true" align="right" spinBox="true" caption="1x99, resolution 1.40Å" /> '''X-ray crystal struct...) |
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| - | [[Image:1x99.gif|left|200px]]<br /><applet load="1x99" size=" | + | [[Image:1x99.gif|left|200px]]<br /><applet load="1x99" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1x99, resolution 1.40Å" /> | caption="1x99, resolution 1.40Å" /> | ||
'''X-ray crystal structure of Xerocomus chrysenteron lectin XCL at 1.4 Angstroms resolution, mutated at Q46M, V54M, L58M'''<br /> | '''X-ray crystal structure of Xerocomus chrysenteron lectin XCL at 1.4 Angstroms resolution, mutated at Q46M, V54M, L58M'''<br /> | ||
==Overview== | ==Overview== | ||
| - | A newly defined family of fungal lectins displays no significant sequence | + | A newly defined family of fungal lectins displays no significant sequence similarity to any protein in the databases. These proteins, made of about 140 amino acid residues, have sequence identities ranging from 38% to 65% and share binding specificity to N-acetyl galactosamine. One member of this family, the lectin XCL from Xerocomus chrysenteron, induces drastic changes in the actin cytoskeleton after sugar binding at the cell surface and internalization, and has potent insecticidal activity. The crystal structure of XCL to 1.4 A resolution reveals the architecture of this new lectin family. The fold of the protein is not related to any of the several lectin folds documented so far. Unexpectedly, the structure similarity is significant with actinoporins, a family of pore-forming toxins. The specific structural features and sequence signatures in each protein family suggest a potential sugar binding site in XCL and a possible evolutionary relationship between these proteins. Finally, the tetrameric assembly of XCL reveals a complex network of protomer-protomer interfaces and generates a large, hydrated cavity of 1000 A3, which may become accessible to larger solutes after a small conformational change of the protein. |
==About this Structure== | ==About this Structure== | ||
| - | 1X99 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Xerocomus_chrysenteron Xerocomus chrysenteron] with SO4 and EDO as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http:// | + | 1X99 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Xerocomus_chrysenteron Xerocomus chrysenteron] with <scene name='pdbligand=SO4:'>SO4</scene> and <scene name='pdbligand=EDO:'>EDO</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1X99 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Marty-Detraves, C.]] | [[Category: Marty-Detraves, C.]] | ||
[[Category: Paquereau, L.]] | [[Category: Paquereau, L.]] | ||
| - | [[Category: Samama, J | + | [[Category: Samama, J P.]] |
[[Category: Schulze-Briese, C.]] | [[Category: Schulze-Briese, C.]] | ||
[[Category: EDO]] | [[Category: EDO]] | ||
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[[Category: fungal lectin]] | [[Category: fungal lectin]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 15:52:19 2008'' |
Revision as of 13:52, 21 February 2008
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X-ray crystal structure of Xerocomus chrysenteron lectin XCL at 1.4 Angstroms resolution, mutated at Q46M, V54M, L58M
Overview
A newly defined family of fungal lectins displays no significant sequence similarity to any protein in the databases. These proteins, made of about 140 amino acid residues, have sequence identities ranging from 38% to 65% and share binding specificity to N-acetyl galactosamine. One member of this family, the lectin XCL from Xerocomus chrysenteron, induces drastic changes in the actin cytoskeleton after sugar binding at the cell surface and internalization, and has potent insecticidal activity. The crystal structure of XCL to 1.4 A resolution reveals the architecture of this new lectin family. The fold of the protein is not related to any of the several lectin folds documented so far. Unexpectedly, the structure similarity is significant with actinoporins, a family of pore-forming toxins. The specific structural features and sequence signatures in each protein family suggest a potential sugar binding site in XCL and a possible evolutionary relationship between these proteins. Finally, the tetrameric assembly of XCL reveals a complex network of protomer-protomer interfaces and generates a large, hydrated cavity of 1000 A3, which may become accessible to larger solutes after a small conformational change of the protein.
About this Structure
1X99 is a Single protein structure of sequence from Xerocomus chrysenteron with and as ligands. Full crystallographic information is available from OCA.
Reference
A new lectin family with structure similarity to actinoporins revealed by the crystal structure of Xerocomus chrysenteron lectin XCL., Birck C, Damian L, Marty-Detraves C, Lougarre A, Schulze-Briese C, Koehl P, Fournier D, Paquereau L, Samama JP, J Mol Biol. 2004 Dec 10;344(5):1409-20. PMID:15561152
Page seeded by OCA on Thu Feb 21 15:52:19 2008
