Extracellular Polysaccharide-Degrading Enzymes of Postia Placenta Isolated from Wood or Artificial Media

  • C. A. Clausen
  • F. GreenIII
  • T. L. Highley
Part of the Biodeterioration Research book series (BIOR, volume 4)


A variety of extracellular polysaccharidases produced by brown-rot fungi are thought to play an important role in the wood-rotting process. There is evidence of early removal of hemicellulose, a principal cell wall constituent, by hemicellulases (xylanases, mannanases), which attack and shorten hemicellulose chains sufficiently for further hydrolysis by glycosidases into simple sugars, thus facilitating colonization and penetration of wood (Kirk and Highley, 1973; Kirk and Cowling, 1984; Highley, 1987). The enzyme b-1,4—xylanase, of the brown-rot fungus Postia placenta (Fr.) M. Lars. et Lomb. MAD 698, has been partially purified (Green et al., 1989b) and used as antigen to produce monoclonal antibodies. This glycoprotein typically co-migrates with carboxymethyl-cellulase and has been comprised of as much as 50 percent carbohydrate when extracted from wood.


Liquid Culture Culture Filtrate Wood Extract Postia Placenta Poria Placenta 
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Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • C. A. Clausen
    • 1
  • F. GreenIII
    • 1
  • T. L. Highley
    • 1
  1. 1.Forest Products LaboratoryUSDA Forest ServiceMadisonUSA

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