5X7S

Crystal structure of Paenibacillus sp. 598K alpha-1,6-glucosyltransferase, terbium derivative


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Carbohydrate-binding architecture of the multi-modular alpha-1,6-glucosyltransferase from Paenibacillus sp. 598K, which produces alpha-1,6-glucosyl-alpha-glucosaccharides from starch

Fujimoto, Z.Suzuki, N.Kishine, N.Ichinose, H.Momma, M.Kimura, A.Funane, K.

(2017) Biochem. J. 474: 2763-2778

  • DOI: 10.1042/BCJ20170152
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Paenibacillus sp. 598K α-1,6-glucosyltransferase (Ps6TG31A), a member of glycoside hydrolase family 31, catalyzes exo-α-glucohydrolysis and transglucosylation and produces α-1,6-glucosyl-α-glucosaccharides from α-glucan via its disproportionation act ...

    Paenibacillus sp. 598K α-1,6-glucosyltransferase (Ps6TG31A), a member of glycoside hydrolase family 31, catalyzes exo-α-glucohydrolysis and transglucosylation and produces α-1,6-glucosyl-α-glucosaccharides from α-glucan via its disproportionation activity. The crystal structure of Ps6TG31A was determined by an anomalous dispersion method using a terbium derivative. The monomeric Ps6TG31A consisted of one catalytic (β/α)8-barrel domain and six small domains, one on the N-terminal and five on the C-terminal side. The structures of the enzyme complexed with maltohexaose, isomaltohexaose, and acarbose demonstrated that the ligands were observed in the catalytic cleft and the sugar-binding sites of four β-domains. The catalytic site was structured by a glucose-binding pocket and an aglycon-binding cleft built by two sidewalls. The bound acarbose was located with its non-reducing end pseudosugar docked in the pocket, and the other moieties along one sidewall serving three subsites for the α-1,4-glucan. The bound isomaltooligosaccharide was found on the opposite sidewall, which provided the space for the acceptor molecule to be positioned for attack of the catalytic intermediate covalent complex during transglucosylation. The N-terminal domain recognized the α-1,4-glucan in a surface-binding mode. Two of the five C-terminal domains belong to the carbohydrate-binding modules family 35 and one to family 61. The sugar complex structures indicated that the first family 35 module preferred α-1,6-glucan, whereas the second family 35 module and family 61 module preferred α-1,4-glucan. Ps6TG31A appears to have enhanced transglucosylation activity facilitated by its carbohydrate-binding modules and substrate-binding cleft that positions the substrate and acceptor sugar for the transglucosylation.


    Related Citations: 
    • Paenibacillus sp. 598K 6-alpha-glucosyltransferase is essential for cycloisomaltooligosaccharide synthesis from alpha-(1 -> 4)-glucan
      Ichinose, H.,Suzuki, R.,Miyazaki, T.,Kimura, K.,Momma, M.,Suzuki, N.,Fujimoto, Z.,Kimura, A.,Funane, K.
      (2017) Appl. Microbiol. Biotechnol. --: --


    Organizational Affiliation

    Advanced Analysis Center, National Agriculture and Food Research Organization (NARO), 2-1-2 Kannondai, Tsukuba, Ibaraki 305-8602, Japan zui@affrc.go.jp funane@affrc.go.jp.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glycoside hydrolase family 31 alpha-glucosidase
A, B
1263Paenibacillus sp. 598KMutation(s): 0 
Gene Names: 6gt31a
Find proteins for A0A193PKW5 (Paenibacillus sp. 598K)
Go to UniProtKB:  A0A193PKW5
Small Molecules
Ligands 7 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
TB
Query on TB

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A, B
TERBIUM(III) ION
Tb
HKCRVXUAKWXBLE-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

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A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CA
Query on CA

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A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
EDO
Query on EDO

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A, B
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
NI
Query on NI

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A, B
NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
 Ligand Interaction
MES
Query on MES

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A, B
2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.185 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 182.815α = 90.00
b = 270.920β = 90.00
c = 133.341γ = 90.00
Software Package:
Software NamePurpose
PHENIXphasing
HKL-2000data reduction
REFMACrefinement
HKL-2000data scaling

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
MAFFJapanA25001

Revision History 

  • Version 1.0: 2017-07-26
    Type: Initial release
  • Version 1.1: 2017-08-23
    Type: Database references
  • Version 1.2: 2017-08-30
    Type: Data collection