2d2o
From Proteopedia
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|PDB= 2d2o |SIZE=350|CAPTION= <scene name='initialview01'>2d2o</scene>, resolution 2.10Å | |PDB= 2d2o |SIZE=350|CAPTION= <scene name='initialview01'>2d2o</scene>, resolution 2.10Å | ||
|SITE= | |SITE= | ||
| - | |LIGAND= <scene name='pdbligand=CA:CALCIUM ION'>CA</scene> | + | |LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=GLC:GLUCOSE'>GLC</scene> |
| - | |ACTIVITY= [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] | + | |ACTIVITY= <span class='plainlinks'>[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] </span> |
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY=[[1vfk|1VFK]], [[1vfm|1VFM]], [[1vfo|1VFO]], [[1vfu|1VFU]] | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2d2o FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2d2o OCA], [http://www.ebi.ac.uk/pdbsum/2d2o PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2d2o RCSB]</span> | ||
}} | }} | ||
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[[Category: Tonozuka, T.]] | [[Category: Tonozuka, T.]] | ||
[[Category: Yoshida, H.]] | [[Category: Yoshida, H.]] | ||
| - | [[Category: CA]] | ||
[[Category: beta/alpha barrel]] | [[Category: beta/alpha barrel]] | ||
| - | ''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 02:29:29 2008'' |
Revision as of 23:29, 30 March 2008
| |||||||
| , resolution 2.10Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , | ||||||
| Activity: | Neopullulanase, with EC number 3.2.1.135 | ||||||
| Related: | 1VFK, 1VFM, 1VFO, 1VFU
| ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Structure of a complex of Thermoactinomyces vulgaris R-47 alpha-amylase 2 with maltohexaose demonstrates the important role of aromatic residues at the reducing end of the substrate binding cleft
Overview
Thermoactinomyces vulgaris R-47 alpha-amylase 2 (TVAII) can efficiently hydrolyze both starch and cyclomaltooligosaccharides (cyclodextrins). The crystal structure of an inactive mutant TVAII in a complex with maltohexaose was determined at a resolution of 2.1A. TVAII adopts a dimeric structure to form two catalytic sites, where substrates are found to bind. At the catalytic site, there are many hydrogen bonds between the enzyme and substrate at the non-reducing end from the hydrolyzing site, but few hydrogen bonds at the reducing end, where two aromatic residues, Trp356 and Tyr45, make effective interactions with a substrate. Trp356 drastically changes its side-chain conformation to achieve a strong stacking interaction with the substrate, and Tyr45 from another molecule forms a water-mediated hydrogen bond with the substrate. Kinetic analysis of the wild-type and mutant enzymes in which Trp356 and/or Tyr45 were replaced with Ala suggested that Trp356 and Tyr45 are essential to the catalytic reaction of the enzyme, and that the formation of a dimeric structure is indispensable for TVAII to hydrolyze both starch and cyclodextrins.
About this Structure
2D2O is a Single protein structure of sequence from Thermoactinomyces vulgaris. Full crystallographic information is available from OCA.
Reference
Structure of a complex of Thermoactinomyces vulgaris R-47 alpha-amylase 2 with maltohexaose demonstrates the important role of aromatic residues at the reducing end of the substrate binding cleft., Ohtaki A, Mizuno M, Yoshida H, Tonozuka T, Sakano Y, Kamitori S, Carbohydr Res. 2006 Jun 12;341(8):1041-6. Epub 2006 Mar 27. PMID:16564038
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