1jac
From Proteopedia
(New page: 200px<br /><applet load="1jac" size="450" color="white" frame="true" align="right" spinBox="true" caption="1jac, resolution 2.43Å" /> '''A NOVEL MODE OF CARB...) |
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| - | [[Image:1jac.gif|left|200px]]<br /><applet load="1jac" size=" | + | [[Image:1jac.gif|left|200px]]<br /><applet load="1jac" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1jac, resolution 2.43Å" /> | caption="1jac, resolution 2.43Å" /> | ||
'''A NOVEL MODE OF CARBOHYDRATE RECOGNITION IN JACALIN, A MORACEAE PLANT LECTIN WITH A BETA-PRISM'''<br /> | '''A NOVEL MODE OF CARBOHYDRATE RECOGNITION IN JACALIN, A MORACEAE PLANT LECTIN WITH A BETA-PRISM'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Jacalin, a tetrameric two-chain lectin (66,000 Mr) from jackfruit seeds, is highly specific for the tumour associated T-antigenic disaccharide. The | + | Jacalin, a tetrameric two-chain lectin (66,000 Mr) from jackfruit seeds, is highly specific for the tumour associated T-antigenic disaccharide. The crystal structure of jacalin with methyl-alpha-D-galactose reveals that each subunit has a three-fold symmetric beta-prism fold made up of three four-stranded beta-sheets. The lectin exhibits a novel carbohydrate-binding site involving the N terminus of the alpha-chain which is generated through a post-translational modification involving proteolysis, the first known instance where such a modification has been used to confer carbohydrate specificity. This new lectin fold may be characteristic of the Moraceae plant family. The structure provides an explanation for the relative affinities of the lectin for galactose derivatives and provides insights into the structural basis of its T-antigen specificity. |
==About this Structure== | ==About this Structure== | ||
| - | 1JAC is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Artocarpus_heterophyllus Artocarpus heterophyllus] with AMG as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http:// | + | 1JAC is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Artocarpus_heterophyllus Artocarpus heterophyllus] with <scene name='pdbligand=AMG:'>AMG</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JAC OCA]. |
==Reference== | ==Reference== | ||
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[[Category: non-legume]] | [[Category: non-legume]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:20:24 2008'' |
Revision as of 11:20, 21 February 2008
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A NOVEL MODE OF CARBOHYDRATE RECOGNITION IN JACALIN, A MORACEAE PLANT LECTIN WITH A BETA-PRISM
Overview
Jacalin, a tetrameric two-chain lectin (66,000 Mr) from jackfruit seeds, is highly specific for the tumour associated T-antigenic disaccharide. The crystal structure of jacalin with methyl-alpha-D-galactose reveals that each subunit has a three-fold symmetric beta-prism fold made up of three four-stranded beta-sheets. The lectin exhibits a novel carbohydrate-binding site involving the N terminus of the alpha-chain which is generated through a post-translational modification involving proteolysis, the first known instance where such a modification has been used to confer carbohydrate specificity. This new lectin fold may be characteristic of the Moraceae plant family. The structure provides an explanation for the relative affinities of the lectin for galactose derivatives and provides insights into the structural basis of its T-antigen specificity.
About this Structure
1JAC is a Protein complex structure of sequences from Artocarpus heterophyllus with as ligand. Full crystallographic information is available from OCA.
Reference
A novel mode of carbohydrate recognition in jacalin, a Moraceae plant lectin with a beta-prism fold., Sankaranarayanan R, Sekar K, Banerjee R, Sharma V, Surolia A, Vijayan M, Nat Struct Biol. 1996 Jul;3(7):596-603. PMID:8673603
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