1sbe: Difference between revisions
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'''SOYBEAN AGGLUTININ FROM GLYCINE MAX''' | {{Structure | ||
|PDB= 1sbe |SIZE=350|CAPTION= <scene name='initialview01'>1sbe</scene>, resolution 2.80Å | |||
|SITE= | |||
|LIGAND= <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene> and <scene name='pdbligand=CA:CALCIUM ION'>CA</scene> | |||
|ACTIVITY= | |||
|GENE= | |||
}} | |||
'''SOYBEAN AGGLUTININ FROM GLYCINE MAX''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
1SBE is a [ | 1SBE is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Glycine_max Glycine max]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SBE OCA]. | ||
==Reference== | ==Reference== | ||
X-ray crystallographic studies of unique cross-linked lattices between four isomeric biantennary oligosaccharides and soybean agglutinin., Olsen LR, Dessen A, Gupta D, Sabesan S, Sacchettini JC, Brewer CF, Biochemistry. 1997 Dec 9;36(49):15073-80. PMID:[http:// | X-ray crystallographic studies of unique cross-linked lattices between four isomeric biantennary oligosaccharides and soybean agglutinin., Olsen LR, Dessen A, Gupta D, Sabesan S, Sacchettini JC, Brewer CF, Biochemistry. 1997 Dec 9;36(49):15073-80. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9398234 9398234] | ||
[[Category: Glycine max]] | [[Category: Glycine max]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: lectin]] | [[Category: lectin]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 14:02:48 2008'' | ||
Revision as of 15:02, 20 March 2008
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| Coordinates: | save as pdb, mmCIF, xml | ||||||
SOYBEAN AGGLUTININ FROM GLYCINE MAX
OverviewOverview
Soybean agglutinin (SBA) (Glycine max) is a tetrameric GalNAc/Gal-specific lectin which forms unique cross-linked complexes with a series of naturally occurring and synthetic multiantennary carbohydrates with terminal GalNAc or Gal residues [Gupta et al. (1994) Biochemistry 33, 7495-7504]. We recently reported the X-ray crystal structure of SBA cross-linked with a biantennary analog of the blood group I carbohydrate antigen [Dessen et al. (1995) Biochemistry 34, 4933-4942]. In order to determine the molecular basis of different carbohydrate-lectin cross-linked lattices, a comparison has been made of the X-ray crystallographic structures of SBA cross-linked with four isomeric analogs of the biantennary blood group I carbohydrate antigen. The four pentasaccharides possess the common structure of (beta-LacNAc)2Gal-beta-R, where R is -O(CH2)5COOCH3. The beta-LacNAc moieties in the four carbohydrates are linked to the 2,3-, 2,4-, 3,6-, and 2,6-positions of the core Gal residue(s), respectively. The structures of all four complexes have been refined to approximately 2.4-2.8 A. Noncovalent lattice formation in all four complexes is promoted uniquely by the bridging action of the two arms of each bivalent carbohydrate. Association between SBA tetramers involves binding of the terminal Gal residues of the pentasaccharides at identical sites in each monomer, with the sugar(s) cross-linking to a symmetry-related neighbor molecule. While the 2,4-, 3,6-, and 2,6-pentasaccharide complexes possess a common P6422 space group, their unit cell dimensions differ. The 2, 3-pentasaccharide cross-linked complex, on the other hand, possesses the space group I4122. Thus, all four complexes are crystallographically distinct. The four cross-linking carbohydrates are in similar conformations, possessing a pseudo-2-fold axis of symmetry which lies on a crystallographic 2-fold axis of symmetry in each lattice. In the case of the 3,6- and 2,6-pentasaccharides, the symmetry of their cross-linked lattices requires different rotamer orientations about their beta(1,6) glycosidic bonds. The results demonstrate that crystal packing interactions are the molecular basis for the formation of distinct cross-linked lattices between SBA and four isomeric pentasaccharides. The present findings are discussed in terms of lectins forming unique cross-linked complexes with glycoconjugate receptors in biological systems.
About this StructureAbout this Structure
1SBE is a Single protein structure of sequence from Glycine max. Full crystallographic information is available from OCA.
ReferenceReference
X-ray crystallographic studies of unique cross-linked lattices between four isomeric biantennary oligosaccharides and soybean agglutinin., Olsen LR, Dessen A, Gupta D, Sabesan S, Sacchettini JC, Brewer CF, Biochemistry. 1997 Dec 9;36(49):15073-80. PMID:9398234
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