1jf6
From Proteopedia
(New page: 200px<br /><applet load="1jf6" size="450" color="white" frame="true" align="right" spinBox="true" caption="1jf6, resolution 3.20Å" /> '''CRYSTAL STRUCTURE OF...) |
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| - | [[Image:1jf6.gif|left|200px]]<br /><applet load="1jf6" size=" | + | [[Image:1jf6.gif|left|200px]]<br /><applet load="1jf6" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1jf6, resolution 3.20Å" /> | caption="1jf6, resolution 3.20Å" /> | ||
'''CRYSTAL STRUCTURE OF THERMOACTINOMYCES VULGARIS R-47 ALPHA-AMYLASE MUTANT F286Y'''<br /> | '''CRYSTAL STRUCTURE OF THERMOACTINOMYCES VULGARIS R-47 ALPHA-AMYLASE MUTANT F286Y'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Phe286 located in the center of the active site of alpha-amylase 2 from | + | Phe286 located in the center of the active site of alpha-amylase 2 from Thermoactinomyces vulgaris R-47 (TVAII) plays an important role in the substrate recognition for cyclomaltooligosaccharides (cyclodextrins). The X-ray structures of mutant TVAIIs with the replacement of Phe286 by Ala (F286A) and Tyr (F286Y) were determined at 3.2 A resolution. Their structures have no significant differences from that of the wild-type enzyme. The kinetic analyses of Phe286-replaced variants showed that the variants with non-aromatic residues, Ala (F286A) and Leu (F286L), have lower enzymatic activities than those with aromatic residues, Tyr (F286Y) and Trp (F286W), and the replacement of Phe286 affects enzymatic activities for CDs more than those for starch. |
==About this Structure== | ==About this Structure== | ||
| - | 1JF6 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Thermoactinomyces_vulgaris Thermoactinomyces vulgaris] with CA as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Neopullulanase Neopullulanase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.135 3.2.1.135] Full crystallographic information is available from [http:// | + | 1JF6 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Thermoactinomyces_vulgaris Thermoactinomyces vulgaris] with <scene name='pdbligand=CA:'>CA</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Neopullulanase Neopullulanase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.135 3.2.1.135] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JF6 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: alpha/beta barrel]] | [[Category: alpha/beta barrel]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:21:57 2008'' |
Revision as of 11:22, 21 February 2008
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CRYSTAL STRUCTURE OF THERMOACTINOMYCES VULGARIS R-47 ALPHA-AMYLASE MUTANT F286Y
Overview
Phe286 located in the center of the active site of alpha-amylase 2 from Thermoactinomyces vulgaris R-47 (TVAII) plays an important role in the substrate recognition for cyclomaltooligosaccharides (cyclodextrins). The X-ray structures of mutant TVAIIs with the replacement of Phe286 by Ala (F286A) and Tyr (F286Y) were determined at 3.2 A resolution. Their structures have no significant differences from that of the wild-type enzyme. The kinetic analyses of Phe286-replaced variants showed that the variants with non-aromatic residues, Ala (F286A) and Leu (F286L), have lower enzymatic activities than those with aromatic residues, Tyr (F286Y) and Trp (F286W), and the replacement of Phe286 affects enzymatic activities for CDs more than those for starch.
About this Structure
1JF6 is a Single protein structure of sequence from Thermoactinomyces vulgaris with as ligand. Active as Neopullulanase, with EC number 3.2.1.135 Full crystallographic information is available from OCA.
Reference
Role of Phe286 in the recognition mechanism of cyclomaltooligosaccharides (cyclodextrins) by Thermoactinomyces vulgaris R-47 alpha-amylase 2 (TVAII). X-ray structures of the mutant TVAIIs, F286A and F286Y, and kinetic analyses of the Phe286-replaced mutant TVAIIs., Ohtaki A, Kondo S, Shimura Y, Tonozuka T, Sakano Y, Kamitori S, Carbohydr Res. 2001 Sep 7;334(4):309-13. PMID:11527532
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