, Volume 15, Issue 3, pp 453–463 | Cite as

Purification and characterization of exo-type cellouronate lyase

  • Naotake Konno
  • Naoto Habu
  • Natsuko Iihashi
  • Akira Isogai


A bacterial strain, Brevundimonas sp. SH203, has an ability to degrade cellouronate, β-(1→4)-linked polyglucuronic acid sodium salt, which is artificially prepared from regenerated cellulose by TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical)-mediated oxidation. In a previous paper, an endo-type cellouronate lyase (CUL-I) has been isolated from the strain. In this paper, we purified another cellouronate lyase, CUL-II, from cell-free extracts of Brevundimonas sp. SH203. CUL-II was a monomeric protein with a molecular mass of 56 kDa by size exclusion chromatography and 62 kDa by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and most active at pH 7.5. CUL-II formed monomers in a small quantity from cellouronate without forming any intermediate oligomers, whereas it degraded C4′–C5′ unsaturated cellouronate dimer more easily. Thus, CUL-II behaves as an exo-type lyase in degradation of cellouronate. When CUL-I and CUL-II were simultaneously treated to cellouronate, it was degraded to monomers more efficiently than treatment with one enzyme alone, CUL-I or CUL-II. Hence, cellouronate is synergistically degraded to monomers by Brevundimonas sp. SH203 by endo- and exo-type lyases, CUL-I and CUL-II, respectively.


Cellouronate TEMPO Biodegradation Lyase Glucuronan 



2,2,6,6-tetramethylpiperidine-1-oxyl radical


Sodium dodecyl sulfate-polyacrylamide gel electrophoresis


Size-exclusion chromatography equipped with a multi-angle laser light scattering detector


Cellouronate lyase


Mixture of 3,3-dimethylglutaric acid, tris(hydroxyethyl)aminomethane and 2-amino-2-methyl-1,3-propanediol


Thin-layer chromatography


2-Thiobarbituric acid


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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Naotake Konno
    • 1
  • Naoto Habu
    • 2
  • Natsuko Iihashi
    • 2
  • Akira Isogai
    • 1
  1. 1.Graduate School of Agricultural and Life SciencesThe University of TokyoBunkyo-kuJapan
  2. 2.Department of Bioproductive ScienceUtsunomiya UniversityUtsunomiyaJapan

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