1g9f
From Proteopedia
(New page: 200px<br /><applet load="1g9f" size="450" color="white" frame="true" align="right" spinBox="true" caption="1g9f, resolution 2.50Å" /> '''CRYSTAL STRUCTURE OF...) |
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| - | [[Image:1g9f.jpg|left|200px]]<br /><applet load="1g9f" size=" | + | [[Image:1g9f.jpg|left|200px]]<br /><applet load="1g9f" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1g9f, resolution 2.50Å" /> | caption="1g9f, resolution 2.50Å" /> | ||
'''CRYSTAL STRUCTURE OF THE SOYBEAN AGGLUTININ IN A COMPLEX WITH A BIANTENNARY BLOOD GROUP ANTIGEN ANALOG'''<br /> | '''CRYSTAL STRUCTURE OF THE SOYBEAN AGGLUTININ IN A COMPLEX WITH A BIANTENNARY BLOOD GROUP ANTIGEN ANALOG'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The legume lectins are widely used as a model system for studying | + | The legume lectins are widely used as a model system for studying protein-carbohydrate and protein-protein interactions. They exhibit a fascinating quaternary structure variation, which becomes important when they interact with multivalent glycoconjugates, for instance those on cell surfaces. Recently, it has become clear that certain lectins form weakly associated oligomers. This phenomenon may play a role in the regulation of receptor crosslinking and subsequent signal transduction. The crystal structure of DB58, a dimeric lectin from the legume Dolichos biflorus reveals a separate dimer of a previously unobserved type, in addition to a tetramer consisting of two such dimers. This tetramer resembles that formed by DBL, the seed lectin from the same plant. A single amino acid substitution in DB58 affects the conformation and flexibility of a loop in the canonical dimer interface. This disrupts the formation of a stable DBL-like tetramer in solution, but does not prohibit its formation in suitable conditions, which greatly increases the possibilities for the cross-linking of multivalent ligands. The non-canonical DB58 dimer has a buried symmetrical alpha helix, which can be present in the crystal in either of two antiparallel orientations. Two existing structures and datasets for lectins with similar quaternary structures were reconsidered. A central alpha helix could be observed in the soybean lectin, but not in the leucoagglutinating lectin from Phaseolus vulgaris. The relative position and orientation of the carbohydrate-binding sites in the DB58 dimer may affect its ability to crosslink mulitivalent ligands, compared to the other legume lectin dimers. |
==About this Structure== | ==About this Structure== | ||
| - | 1G9F is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Glycine_max Glycine max] with MN and CA as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http:// | + | 1G9F is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Glycine_max Glycine max] with <scene name='pdbligand=MN:'>MN</scene> and <scene name='pdbligand=CA:'>CA</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1G9F OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Buts, L.]] | [[Category: Buts, L.]] | ||
| - | [[Category: Dao-Thi, M | + | [[Category: Dao-Thi, M H.]] |
| - | [[Category: Etzler, M | + | [[Category: Etzler, M E.]] |
| - | [[Category: Hamelryck, T | + | [[Category: Hamelryck, T W.]] |
[[Category: Loris, R.]] | [[Category: Loris, R.]] | ||
[[Category: Wyns, L.]] | [[Category: Wyns, L.]] | ||
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[[Category: legume lectin]] | [[Category: legume lectin]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:47:35 2008'' |
Revision as of 10:47, 21 February 2008
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CRYSTAL STRUCTURE OF THE SOYBEAN AGGLUTININ IN A COMPLEX WITH A BIANTENNARY BLOOD GROUP ANTIGEN ANALOG
Overview
The legume lectins are widely used as a model system for studying protein-carbohydrate and protein-protein interactions. They exhibit a fascinating quaternary structure variation, which becomes important when they interact with multivalent glycoconjugates, for instance those on cell surfaces. Recently, it has become clear that certain lectins form weakly associated oligomers. This phenomenon may play a role in the regulation of receptor crosslinking and subsequent signal transduction. The crystal structure of DB58, a dimeric lectin from the legume Dolichos biflorus reveals a separate dimer of a previously unobserved type, in addition to a tetramer consisting of two such dimers. This tetramer resembles that formed by DBL, the seed lectin from the same plant. A single amino acid substitution in DB58 affects the conformation and flexibility of a loop in the canonical dimer interface. This disrupts the formation of a stable DBL-like tetramer in solution, but does not prohibit its formation in suitable conditions, which greatly increases the possibilities for the cross-linking of multivalent ligands. The non-canonical DB58 dimer has a buried symmetrical alpha helix, which can be present in the crystal in either of two antiparallel orientations. Two existing structures and datasets for lectins with similar quaternary structures were reconsidered. A central alpha helix could be observed in the soybean lectin, but not in the leucoagglutinating lectin from Phaseolus vulgaris. The relative position and orientation of the carbohydrate-binding sites in the DB58 dimer may affect its ability to crosslink mulitivalent ligands, compared to the other legume lectin dimers.
About this Structure
1G9F is a Single protein structure of sequence from Glycine max with and as ligands. Full crystallographic information is available from OCA.
Reference
Weak protein-protein interactions in lectins: the crystal structure of a vegetative lectin from the legume Dolichos biflorus., Buts L, Dao-Thi MH, Loris R, Wyns L, Etzler M, Hamelryck T, J Mol Biol. 2001 May 25;309(1):193-201. PMID:11491289
Page seeded by OCA on Thu Feb 21 12:47:35 2008
Categories: Glycine max | Single protein | Buts, L. | Dao-Thi, M H. | Etzler, M E. | Hamelryck, T W. | Loris, R. | Wyns, L. | CA | MN | Jelly-roll fold | Legume lectin
