1V3J

Crystal structure of F283L mutant cyclodextrin glycosyltransferase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.170 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Role of Phe283 in enzymatic reaction of cyclodextrin glycosyltransferase from alkalophilic Bacillus sp.1011: Substrate binding and arrangement of the catalytic site

Kanai, R.Haga, K.Akiba, T.Yamane, K.Harata, K.

(2004) PROTEIN SCI. 13: 457-465

  • DOI: 10.1110/ps.03408504
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Cyclodextrin glycosyltransferase (CGTase) belonging to the alpha-amylase family mainly catalyzes transglycosylation and produces cyclodextrins from starch and related alpha-1,4-glucans. The catalytic site of CGTase specifically conserves four aromati ...

    Cyclodextrin glycosyltransferase (CGTase) belonging to the alpha-amylase family mainly catalyzes transglycosylation and produces cyclodextrins from starch and related alpha-1,4-glucans. The catalytic site of CGTase specifically conserves four aromatic residues, Phe183, Tyr195, Phe259, and Phe283, which are not found in alpha-amylase. To elucidate the structural role of Phe283, we determined the crystal structures of native and acarbose-complexed mutant CGTases in which Phe283 was replaced with leucine (F283L) or tyrosine (F283Y). The temperature factors of the region 259-269 in native F283L increased >10 A(2) compared with the wild type. The complex formation with acarbose not only increased the temperature factors (>10 A(2)) but also changed the structure of the region 257-267. This region is stabilized by interactions of Phe283 with Phe259 and Leu260 and plays an important role in the cyclodextrin binding. The conformation of the side-chains of Glu257, Phe259, His327, and Asp328 in the catalytic site was altered by the mutation of Phe283 with leucine, and this indicates that Phe283 partly arranges the structure of the catalytic site through contacts with Glu257 and Phe259. The replacement of Phe283 with tyrosine decreased the enzymatic activity in the basic pH range. The hydroxyl group of Tyr283 forms hydrogen bonds with the carboxyl group of Glu257, and the pK(a) of Glu257 in F283Y may be lower than that in the wild type.


    Related Citations: 
    • X-ray Structure of Cyclodextrin Glucano-transferase from Alkalophilic Bacillus Sp. 1011. Comparison of Two Independent Molecules at 1.8 Angstrom Resolution
      Harata, K.,Haga, K.,Nakamura, A.,Aoyagi, M.,Yamane, K.
      (1996) Acta Crystallogr.,Sect.D 52: 1136
    • Effects of essential carbohydrate/aromatic stacking interaction with Tyr100 and Phe259 on substrate binding of cyclodextrin glycosyltransferase from alkalophilic Bacillus sp. 1011
      Haga, K.,Kanai, R.,Sakamoto, O.,Aoyagi, M.,Harata, K.,Yamane, K.
      (2003) J.Biochem.(Tokyo) 134: 881


    Organizational Affiliation

    Biological Information Research Center, AIST Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cyclomaltodextrin glucanotransferase
A, B
686Bacillus sp. (strain 1011)Mutation(s): 1 
Gene Names: cgt
EC: 2.4.1.19
Find proteins for P05618 (Bacillus sp. (strain 1011))
Go to UniProtKB:  P05618
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.170 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 63.930α = 85.11
b = 73.660β = 104.96
c = 78.200γ = 100.97
Software Package:
Software NamePurpose
FFFEARdata reduction
MADNESSdata collection
X-PLORrefinement
X-PLORphasing
MADNESSdata reduction
FFFEARdata scaling
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-08-03
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Source and taxonomy, Version format compliance
  • Version 1.3: 2017-10-04
    Type: Refinement description