Thermoactinomyces vulgaris R-47 alpha-amylase 1 mutant enzyme w398v

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.196 

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This is version 1.5 of the entry. See complete history


Mutual conversion of substrate specificities of Thermoactinomyces vulgaris R-47 alpha-amylases TVAI and TVAII by site-directed mutagenesis

Ohtaki, A.Iguchi, A.Mizuno, M.Tonozuka, T.Sakano, Y.Kamitori, S.

(2003) Carbohydr Res 338: 1553-1558

  • DOI: https://doi.org/10.1016/s0008-6215(03)00219-2
  • Primary Citation of Related Structures:  
    1IZJ, 1IZK

  • PubMed Abstract: 

    Thermoactinomyces vulgaris R-47 produces two alpha-amylases, TVAI and TVAII, differing in substrate specificity from each other. TVAI favors high-molecular-weight substrates like starch, and scarcely hydrolyzes cyclomaltooligosaccharides (cyclodextrins) with a small cavity. TVAII favors low-molecular-weight substrates like oligosaccharides, and can efficiently hydrolyze cyclodextrins with various sized cavities. To understand the relationship between the structure and substrate specificity of these enzymes, we precisely examined the roles of key residues for substrate recognition by X-ray structural and kinetic parameter analyses of mutant enzymes and successfully obtained mutants in which the substrate specificity of each enzyme is partially converted into that of another.

  • Organizational Affiliation

    Department of Biotechnology and Life Science, Faculty of Technology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
amylase637Thermoactinomyces vulgarisMutation(s): 1 
Find proteins for Q60053 (Thermoactinomyces vulgaris)
Explore Q60053 
Go to UniProtKB:  Q60053
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ60053
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.196 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 122.72α = 90
b = 50.82β = 104.19
c = 108.82γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-07-29
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-04
    Changes: Refinement description
  • Version 1.4: 2021-11-10
    Changes: Database references, Derived calculations
  • Version 1.5: 2023-12-27
    Changes: Data collection