3WNK

Crystal Structure of Bacillus circulans T-3040 cycloisomaltooligosaccharide glucanotransferase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.158 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural elucidation of the cyclization mechanism of alpha-1,6-glucan by Bacillus circulans T-3040 cycloisomaltooligosaccharide glucanotransferase.

Suzuki, N.Fujimoto, Z.Kim, Y.M.Momma, M.Kishine, N.Suzuki, R.Suzuki, S.Kitamura, S.Kobayashi, M.Kimura, A.Funane, K.

(2014) J.Biol.Chem. 289: 12040-12051

  • DOI: 10.1074/jbc.M114.547992
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Bacillus circulans T-3040 cycloisomaltooligosaccharide glucanotransferase belongs to the glycoside hydrolase family 66 and catalyzes an intramolecular transglucosylation reaction that produces cycloisomaltooligosaccharides from dextran. The crystal s ...

    Bacillus circulans T-3040 cycloisomaltooligosaccharide glucanotransferase belongs to the glycoside hydrolase family 66 and catalyzes an intramolecular transglucosylation reaction that produces cycloisomaltooligosaccharides from dextran. The crystal structure of the core fragment from Ser-39 to Met-738 of B. circulans T-3040 cycloisomaltooligosaccharide glucanotransferase, devoid of its N-terminal signal peptide and C-terminal nonconserved regions, was determined. The structural model contained one catalytic (β/α)8-barrel domain and three β-domains. Domain N with an immunoglobulin-like β-sandwich fold was attached to the N terminus; domain C with a Greek key β-sandwich fold was located at the C terminus, and a carbohydrate-binding module family 35 (CBM35) β-jellyroll domain B was inserted between the 7th β-strand and the 7th α-helix of the catalytic domain A. The structures of the inactive catalytic nucleophile mutant enzyme complexed with isomaltohexaose, isomaltoheptaose, isomaltooctaose, and cycloisomaltooctaose revealed that the ligands bound in the catalytic cleft and the sugar-binding site of CBM35. Of these, isomaltooctaose bound in the catalytic site extended to the second sugar-binding site of CBM35, which acted as subsite -8, representing the enzyme·substrate complex when the enzyme produces cycloisomaltooctaose. The isomaltoheptaose and cycloisomaltooctaose bound in the catalytic cleft with a circular structure around Met-310, representing the enzyme·product complex. These structures collectively indicated that CBM35 functions in determining the size of the product, causing the predominant production of cycloisomaltooctaose by the enzyme. The canonical sugar-binding site of CBM35 bound the mid-part of isomaltooligosaccharides, indicating that the original function involved substrate binding required for efficient catalysis.


    Related Citations: 
    • Deletion analysis of regions at the C-terminal part of cycloisomaltooligosaccharide glucanotransferase from Bacillus circulans T-3040.
      Funane, K.,Kawabata, Y.,Suzuki, R.,Kim, Y.M.,Kang, H.K.,Suzuki, N.,Fujimoto, Z.,Kimura, A.,Kobayashi, M.
      (2011) Biochim.Biophys.Acta 1814: 428
    • Crystallization and preliminary X-ray crystallographic analysis of cycloisomaltooligosaccharide glucanotransferase from Bacillus circulans T-3040.
      Suzuki, N.,Kim, Y.M.,Momma, M.,Fujimoto, Z.,Kobayashi, M.,Kimura, A.,Funane, K.
      (2013) Acta Crystallogr.,Sect.F 69: 946


    Organizational Affiliation

    From the Biomolecular Research Unit, National Institute of Agrobiological Sciences, Tsukuba 305-8602.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cycloisomaltooligosaccharide glucanotransferase
A
721Bacillus circulansMutation(s): 0 
EC: 2.4.1.248
Find proteins for P94286 (Bacillus circulans)
Go to UniProtKB:  P94286
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

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A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

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A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

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A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

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A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
CD
Query on CD

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A
CADMIUM ION
Cd
WLZRMCYVCSSEQC-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.158 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 106.437α = 90.00
b = 106.437β = 90.00
c = 160.625γ = 120.00
Software Package:
Software NamePurpose
ADSCdata collection
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
SOLVEphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-02-05
    Type: Initial release
  • Version 1.1: 2015-03-04
    Type: Database references