1D7F

CRYSTAL STRUCTURE OF ASPARAGINE 233-REPLACED CYCLODEXTRIN GLUCANOTRANSFERASE FROM ALKALOPHILIC BACILLUS SP. 1011 DETERMINED AT 1.9 A RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.156 

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This is version 1.4 of the entry. See complete history


Literature

Crystal structure of asparagine 233-replaced cyclodextrin glucanotransferase from alkalophilic Bacillus sp. 1011 determined at 1.9 A resolution.

Ishii, N.Haga, K.Yamane, K.Harata, K.

(2000) J Mol Recognit 13: 35-43

  • DOI: 10.1002/(SICI)1099-1352(200001/02)13:1<35::AID-JMR481>3.0.CO;2-J
  • Primary Citation of Related Structures:  
    1D7F

  • PubMed Abstract: 
  • The crystal structure of asparagine 233-replaced cyclodextrin glucanotransferase from alkalophilic Bacillus sp. 1011 was determined at 1.9 A resolution. While the wild-type CGTase from the same bacterium produces a mixture of mainly alpha-, beta- and gamma-cyclodextrins, catalyzing the conversion of starch into cyclic or linear alpha-1,4-linked glucopyranosyl chains, site-directed mutation of histidine-233 to asparagine changed the nature of the enzyme such that it no longer produced alpha-cyclodextrin ...

    The crystal structure of asparagine 233-replaced cyclodextrin glucanotransferase from alkalophilic Bacillus sp. 1011 was determined at 1.9 A resolution. While the wild-type CGTase from the same bacterium produces a mixture of mainly alpha-, beta- and gamma-cyclodextrins, catalyzing the conversion of starch into cyclic or linear alpha-1,4-linked glucopyranosyl chains, site-directed mutation of histidine-233 to asparagine changed the nature of the enzyme such that it no longer produced alpha-cyclodextrin. This is a promising step towards an industrial requirement, i.e. unification of the products from the enzyme. Two independent molecules were found in an asymmetric unit, related by pseudo two-fold symmetry. The backbone structure of the mutant enzyme was very similar to that of the wild-type CGTase except that the position of the side chain of residue 233 was such that it is not likely to participate in the catalytic function. The active site cleft was filled with several water molecules, forming a hydrogen bond network with various polar side chains of the enzyme, but not with asparagine-233. The differences in hydrogen bonds in the neighborhood of asparagine-233, maintaining the architecture of the active site cleft, seem to be responsible for the change in molecular recognition of both substrate and product of the mutant CGTase.


    Organizational Affiliation

    Biophysical Chemistry Laboratory, National Institute of Bioscience and Human Technology, Tsukuba, Ibaraki 305-8566, Japan. ishii@nibh.go.jp



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CYCLODEXTRIN GLUCANOTRANSFERASEA, B686Bacillus sp. 1011Mutation(s): 1 
Gene Names: cgt
EC: 2.4.1.19
UniProt
Find proteins for P05618 (Bacillus sp. (strain 1011))
Explore P05618 
Go to UniProtKB:  P05618
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.156 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.86α = 85.1
b = 74.46β = 105
c = 79.1γ = 100.9
Software Package:
Software NamePurpose
MADNESSdata collection
MERGEFdata reduction
X-PLORmodel building
X-PLORrefinement
MADNESSdata reduction
MERGEFdata scaling
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-03-17
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.3: 2017-10-04
    Changes: Refinement description
  • Version 1.4: 2018-04-18
    Changes: Data collection