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2dfz
From Proteopedia
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|PDB= 2dfz |SIZE=350|CAPTION= <scene name='initialview01'>2dfz</scene>, resolution 2.50Å | |PDB= 2dfz |SIZE=350|CAPTION= <scene name='initialview01'>2dfz</scene>, resolution 2.50Å | ||
|SITE= | |SITE= | ||
| - | |LIGAND= | + | |LIGAND= <scene name='pdbligand=GLC:GLUCOSE'>GLC</scene> |
|ACTIVITY= | |ACTIVITY= | ||
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY= | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2dfz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2dfz OCA], [http://www.ebi.ac.uk/pdbsum/2dfz PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2dfz RCSB]</span> | ||
}} | }} | ||
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[[Category: cyclodextrin]] | [[Category: cyclodextrin]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 02:34:09 2008'' |
Revision as of 23:34, 30 March 2008
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| , resolution 2.50Å | |||||||
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| Ligands: | |||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Crystal structure of cyclodextrin-binding protein complexed with gamma-cyclodextrin
Overview
The crystal structure of a Thermoactinomyces vulgaris cyclo/maltodextrin-binding protein (TvuCMBP) complexed with gamma-cyclodextrin has been determined. Like Escherichia coli maltodextrin-binding protein (EcoMBP) and other bacterial sugar-binding proteins, TvuCMBP consists of two domains, an N- and a C-domain, both of which are composed of a central beta-sheet surrounded by alpha-helices; the domains are joined by a hinge region containing three segments. gamma-Cyclodextrin is located at a cleft formed by the two domains. A common functional conformational change has been reported in this protein family, which involves switching from an open form to a sugar-transporter bindable form, designated a closed form. The TvuCMBP-gamma-cyclodextrin complex structurally resembles the closed form of EcoMBP, indicating that TvuCMBP complexed with gamma-cyclodextrin adopts the closed form. The fluorescence measurements also showed that the affinities of TvuCMBP for cyclodextrins were almost equal to those for maltooligosaccharides. Despite having similar folds, the sugar-binding site of the N-domain part of TvuCMBP and other bacterial sugar-binding proteins are strikingly different. In TvuCMBP, the side-chain of Leu59 protrudes from the N-domain part into the sugar-binding cleft and orients toward the central cavity of gamma-cyclodextrin, thus Leu59 appears to play the key role in binding. The cleft of the sugar-binding site of TvuCMBP is also wider than that of EcoMBP. These findings suggest that the sugar-binding site of the N-domain part and the wide cleft are critical in determining the specificity of TvuCMBP for gamma-cyclodextrin.
About this Structure
2DFZ is a Single protein structure of sequence from Thermoactinomyces vulgaris. Full crystallographic information is available from OCA.
Reference
Structural basis for cyclodextrin recognition by Thermoactinomyces vulgaris cyclo/maltodextrin-binding protein., Tonozuka T, Sogawa A, Yamada M, Matsumoto N, Yoshida H, Kamitori S, Ichikawa K, Mizuno M, Nishikawa A, Sakano Y, FEBS J. 2007 Apr;274(8):2109-20. Epub 2007 Mar 20. PMID:17371546
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