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1bfn
From Proteopedia
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[[Image:1bfn.gif|left|200px]] | [[Image:1bfn.gif|left|200px]] | ||
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'''BETA-AMYLASE/BETA-CYCLODEXTRIN COMPLEX''' | '''BETA-AMYLASE/BETA-CYCLODEXTRIN COMPLEX''' | ||
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[[Category: Mikami, B.]] | [[Category: Mikami, B.]] | ||
[[Category: Utsumi, S.]] | [[Category: Utsumi, S.]] | ||
| - | [[Category: | + | [[Category: Beta-amylase]] |
| - | [[Category: | + | [[Category: Beta-cyclodextrin]] |
| - | [[Category: | + | [[Category: Hydrolase]] |
| - | [[Category: | + | [[Category: Recombinant]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 11:27:01 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 08:27, 2 May 2008
BETA-AMYLASE/BETA-CYCLODEXTRIN COMPLEX
Overview
In order to study the interaction of soybean beta-amylase with substrate, we solved the crystal structure of beta-cyclodextrin-enzyme complex and compared it with that of alpha-cyclodextrin-enzyme complex. The enzyme was expressed in Escherichia coli at a high level as a soluble and catalytically active protein. The purified recombinant enzyme had properties nearly identical to those of native soybean beta-amylase and formed the same crystals as the native enzyme. The crystal structure of recombinant enzyme complexed with beta-cyclodextrin was refined at 2. 07-A resolution with a final crystallographic R value of 15.8% (Rfree = 21.1%). The root mean square deviation in the position of C-alpha atoms between this recombinant enzyme and the native enzyme was 0.22 A. These results indicate that the expression system established here is suitable for studying structure-function relationships of beta-amylase. The conformation of the bound beta-cyclodextrin takes an ellipsoid shape in contrast to the circular shape of the bound alpha-cyclodextrin. The cyclodextrins shared mainly two glucose binding sites, 3 and 4. The glucose residue 4 was slightly shifted from the maltose binding site. This suggests that the binding site of the cyclodextrins is important for its holding of a cleaved substrate, which enables the multiple attack mechanism of beta-amylase.
About this Structure
1BFN is a Single protein structure of sequence from Glycine max. Full crystallographic information is available from OCA.
Reference
Crystal structure of recombinant soybean beta-amylase complexed with beta-cyclodextrin., Adachi M, Mikami B, Katsube T, Utsumi S, J Biol Chem. 1998 Jul 31;273(31):19859-65. PMID:9677422 Page seeded by OCA on Fri May 2 11:27:01 2008
