Crystal structure of Ruminococcus albus beta-(1,4)-mannooligosaccharide phosphorylase (RaMP2) in complexes with phosphate and beta-(1,4)-mannobiose

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.168 

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This is version 2.1 of the entry. See complete history


Structural insights into the difference in substrate recognition of two mannoside phosphorylases from two GH130 subfamilies.

Ye, Y.Saburi, W.Odaka, R.Kato, K.Sakurai, N.Komoda, K.Nishimoto, M.Kitaoka, M.Mori, H.Yao, M.

(2016) FEBS Lett 590: 828-837

  • DOI: https://doi.org/10.1002/1873-3468.12105
  • Primary Citation of Related Structures:  
    5AY9, 5AYC, 5AYD, 5AYE

  • PubMed Abstract: 

    In Ruminococcus albus, 4-O-β-D-mannosyl-D-glucose phosphorylase (RaMP1) and β-(1,4)-mannooligosaccharide phosphorylase (RaMP2) belong to two subfamilies of glycoside hydrolase family 130. The two enzymes phosphorolyze β-mannosidic linkages at the nonreducing ends of their substrates, and have substantially diverse substrate specificity. The differences in their mechanism of substrate binding have not yet been fully clarified. In the present study, we report the crystal structures of RaMP1 with/without 4-O-β-D-mannosyl-d-glucose and RaMP2 with/without β-(1→4)-mannobiose. The structures of the two enzymes differ at the +1 subsite of the substrate-binding pocket. Three loops are proposed to determine the different substrate specificities. One of these loops is contributed from the adjacent molecule of the oligomer structure. In RaMP1, His245 of loop 3 forms a hydrogen-bond network with the substrate through a water molecule, and is indispensible for substrate binding.

  • Organizational Affiliation

    Graduate School of Life Science, Hokkaido University, Sapporo, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-1,4-mannooligosaccharide phosphorylase
A, B, C, D, E
A, B, C, D, E, F
335Ruminococcus albus 7 = DSM 20455Mutation(s): 0 
Gene Names: Rumal_0099
Find proteins for E6UBR9 (Ruminococcus albus (strain ATCC 27210 / DSM 20455 / JCM 14654 / NCDO 2250 / 7))
Explore E6UBR9 
Go to UniProtKB:  E6UBR9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupE6UBR9
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
G, H, I, J, K
G, H, I, J, K, L
Glycosylation Resources
GlyTouCan:  G78317QO
GlyCosmos:  G78317QO
GlyGen:  G78317QO
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.168 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92.474α = 90
b = 166.151β = 118.87
c = 92.722γ = 90
Software Package:
Software NamePurpose
XDSdata processing
PHENIXmodel building

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-03-23
    Type: Initial release
  • Version 1.1: 2016-04-06
    Changes: Database references
  • Version 1.2: 2020-02-26
    Changes: Data collection, Database references, Derived calculations
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2024-03-20
    Changes: Data collection, Database references, Derived calculations, Structure summary