4ZLG

Cellobionic acid phosphorylase - gluconic acid complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.169 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structure and Substrate Recognition of Cellobionic Acid Phosphorylase, Which Plays a Key Role in Oxidative Cellulose Degradation by Microbes.

Nam, Y.W.Nihira, T.Arakawa, T.Saito, Y.Kitaoka, M.Nakai, H.Fushinobu, S.

(2015) J.Biol.Chem. 290: 18281-18292

  • DOI: 10.1074/jbc.M115.664664
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The microbial oxidative cellulose degradation system is attracting significant research attention after the recent discovery of lytic polysaccharide mono-oxygenases. A primary product of the oxidative and hydrolytic cellulose degradation system is ce ...

    The microbial oxidative cellulose degradation system is attracting significant research attention after the recent discovery of lytic polysaccharide mono-oxygenases. A primary product of the oxidative and hydrolytic cellulose degradation system is cellobionic acid (CbA), the aldonic acid form of cellobiose. We previously demonstrated that the intracellular enzyme belonging to glycoside hydrolase family 94 from cellulolytic fungus and bacterium is cellobionic acid phosphorylase (CBAP), which catalyzes reversible phosphorolysis of CbA into glucose 1-phosphate and gluconic acid (GlcA). In this report, we describe the biochemical characterization and the three-dimensional structure of CBAP from the marine cellulolytic bacterium Saccharophagus degradans. Structures of ligand-free and complex forms with CbA, GlcA, and a synthetic disaccharide product from glucuronic acid were determined at resolutions of up to 1.6 Å. The active site is located near the dimer interface. At subsite +1, the carboxylate group of GlcA and CbA is recognized by Arg-609 and Lys-613. Additionally, one residue from the neighboring protomer (Gln-190) is involved in the carboxylate recognition of GlcA. A mutational analysis indicated that these residues are critical for the binding and catalysis of the aldonic and uronic acid acceptors GlcA and glucuronic acid. Structural and sequence comparisons with other glycoside hydrolase family 94 phosphorylases revealed that CBAPs have a unique subsite +1 with a distinct amino acid residue conservation pattern at this site. This study provides molecular insight into the energetically efficient metabolic pathway of oxidized sugars that links the oxidative cellulolytic pathway to the glycolytic and pentose phosphate pathways in cellulolytic microbes.


    Related Citations: 
    • Discovery of cellobionic acid phosphorylase in cellulolytic bacteria and fungi
      Nihira, T.,Saito, Y.,Nishimoto, M.,Kitaoka, M.,Igarashi, K.,Ohtsubo, K.,Nakai, H.
      (2013) FEBS LETT. 587: 3556


    Organizational Affiliation

    From the Department of Biotechnology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Putative b-glycan phosphorylase
A
796Saccharophagus degradans (strain 2-40 / ATCC 43961 / DSM 17024)Mutation(s): 1 
Gene Names: cep94B
Find proteins for Q21MB1 (Saccharophagus degradans (strain 2-40 / ATCC 43961 / DSM 17024))
Go to UniProtKB:  Q21MB1
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CL
Query on CL

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Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

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

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Download CCD File 
A
GLUCONIC ACID
C6 H12 O7
RGHNJXZEOKUKBD-SQOUGZDYSA-N
 Ligand Interaction
LGC
Query on LGC

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Download CCD File 
A
(3S,4R,5R,6S)-3,4,5-TRIHYDROXY-6-(HYDROXYMETHYL)TETRAHYDRO-2H-PYRAN-2-ONE
GLUCONOLACTONE
C6 H10 O6
PHOQVHQSTUBQQK-SQOUGZDYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.169 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 106.993α = 90.00
b = 106.993β = 90.00
c = 186.544γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
PHENIXphasing
HKL-2000data scaling
Cootmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Science and Technology Research Promotion Program for Agriculture, Forestry, Fisheries and Food IndustryJapan25010A

Revision History 

  • Version 1.0: 2015-06-10
    Type: Initial release
  • Version 1.1: 2015-06-17
    Type: Database references
  • Version 1.2: 2015-08-05
    Type: Database references