Crystal Structure of Alg17c Mutant H202L

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.194 

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Structure of a PL17 Family Alginate Lyase Demonstrates Functional Similarities among Exotype Depolymerases.

Park, D.Jagtap, S.Nair, S.K.

(2014) J Biol Chem 289: 8645-8655

  • DOI: https://doi.org/10.1074/jbc.M113.531111
  • Primary Citation of Related Structures:  
    4NEI, 4OJZ, 4OK2, 4OK4

  • PubMed Abstract: 

    Brown macroalgae represent an ideal source for complex polysaccharides that can be utilized as precursors for cellulosic biofuels. The lack of recalcitrant lignin components in macroalgae polysaccharide reserves provides a facile route for depolymerization of constituent polysaccharides into simple monosaccharides. The most abundant sugars in macroalgae are alginate, mannitol, and glucan, and although several classes of enzymes that can catabolize the latter two have been characterized, studies of alginate-depolymerizing enzymes have lagged. Here, we present several crystal structures of Alg17c from marine bacterium Saccharophagus degradans along with structure-function characterization of active site residues that are suggested to be involved in the exolytic mechanism of alginate depolymerization. This represents the first structural and biochemical characterization of a family 17 polysaccharide lyase enzyme. Despite the lack of appreciable sequence conservation, the structure and β-elimination mechanism for glycolytic bond cleavage by Alg17c are similar to those observed for family 15 polysaccharide lyases and other lyases. This work illuminates the evolutionary relationships among enzymes within this unexplored class of polysaccharide lyases and reinforces the notion of a structure-based hierarchy in the classification of these enzymes.

  • Organizational Affiliation

    From the Departments of Biochemistry and.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative alginate lyase
A, B
736Saccharophagus degradans 2-40Mutation(s): 1 
Gene Names: alg17Aalg17CSde_3284
Find proteins for Q21FJ0 (Saccharophagus degradans (strain 2-40 / ATCC 43961 / DSM 17024))
Explore Q21FJ0 
Go to UniProtKB:  Q21FJ0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ21FJ0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.194 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.47α = 90
b = 127.153β = 111.2
c = 88.277γ = 90
Software Package:
Software NamePurpose
MAR345dtbdata collection
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-01-29
    Type: Initial release
  • Version 1.1: 2014-03-05
    Changes: Database references
  • Version 1.2: 2014-04-09
    Changes: Database references
  • Version 1.3: 2024-02-28
    Changes: Data collection, Database references, Derived calculations