7ESM

Crystal structure of a L-rhamnose-alpha-1,4-D-glucuronate lyase from Fusarium oxysporum 12S, L-Rha complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 

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This is version 1.1 of the entry. See complete history


Literature

Structural and functional analysis of gum arabic l-rhamnose-alpha-1,4-d-glucuronate lyase establishes a novel polysaccharide lyase family.

Kondo, T.Kichijo, M.Maruta, A.Nakaya, M.Takenaka, S.Arakawa, T.Fushinobu, S.Sakamoto, T.

(2021) J Biol Chem 297: 101001-101001

  • DOI: 10.1016/j.jbc.2021.101001
  • Primary Citation of Related Structures:  
    7ESK, 7ESL, 7ESM, 7ESN

  • PubMed Abstract: 
  • Gum arabic (GA) is widely used as an emulsion stabilizer and coating in several industrial applications, such as foods and pharmaceuticals. GA contains a complex carbohydrate moiety, and the nonreducing ends of the side chains are often capped with l-rhamnose; thus, enzymes that can remove these caps are promising tools for the structural analysis of the carbohydrates comprising GA ...

    Gum arabic (GA) is widely used as an emulsion stabilizer and coating in several industrial applications, such as foods and pharmaceuticals. GA contains a complex carbohydrate moiety, and the nonreducing ends of the side chains are often capped with l-rhamnose; thus, enzymes that can remove these caps are promising tools for the structural analysis of the carbohydrates comprising GA. In this study, GA-specific l-rhamnose-α-1,4-d-glucuronate lyase from the fungus Fusarium oxysporum 12S (FoRham1) was cloned and characterized. FoRham1 showed the highest amino acid sequence similarity with enzymes belonging to the glycoside hydrolase family 145; however, the catalytic residue on the posterior pocket of the β-propeller fold protein was not conserved. The catalytic residues of FoRham1 were instead conserved with ulvan lyases belonging to polysaccharide lyase family 24. Kinetic analysis showed that FoRham1 has the highest catalytic efficiency for the substrate α-l-rhamnose-(1→4)-d-glucuronic acid. The crystal structures of ligand-free and α-l-rhamnose-(1→4)-d-glucuronic acid -bound FoRham1 were determined, and the active site was identified on the anterior side of the β-propeller. The three-dimensional structure of the active site and mutagenesis analysis revealed the detailed catalytic mechanism of FoRham1. Our findings offer a new enzymatic tool for the further analysis of the GA carbohydrate structure and for elucidating its physiological functions in plants. Based on these results, we renamed glycoside hydrolase family 145 as a new polysaccharide lyase family 42, in which FoRham1 is included.


    Organizational Affiliation

    Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka, Japan. Electronic address: sakamoto@biochem.osakafu-u.ac.jp.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
L-rhamnose-alpha-1,4-D-glucuronate lyaseA443Fusarium oxysporumMutation(s): 0 
Gene Names: Forham1
EC: 4.2.2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 2
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseB 4N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G81315DD
GlyCosmos:  G81315DD
GlyGen:  G81315DD
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
RAM (Subject of Investigation/LOI)
Query on RAM

Download Ideal Coordinates CCD File 
C [auth A]alpha-L-rhamnopyranose
C6 H12 O5
SHZGCJCMOBCMKK-HGVZOGFYSA-N
 Ligand Interaction
ACT (Subject of Investigation/LOI)
Query on ACT

Download Ideal Coordinates CCD File 
D [auth A]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
NA (Subject of Investigation/LOI)
Query on NA

Download Ideal Coordinates CCD File 
E [auth A]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.19α = 90
b = 65.039β = 90
c = 107.714γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
Aimlessdata scaling
MOLREPphasing
Cootmodel building

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2021-08-04
    Type: Initial release
  • Version 1.1: 2021-09-01
    Changes: Database references