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Lignin-modifying enzymes of flavodon flavus, a basidiomycete isolated from a coastal marine environment
MedLine Citation:
PMID:  10224007     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
A basidiomycetous fungus Flavodon flavus (Klotzsch) Ryvarden (strain 312), isolated from decaying sea grass from a coral lagoon off the west coast of India, mineralized nearly 24% of 14C-labeled synthetic lignin to 14CO2 in 24 days. When grown in low-nitrogen medium (2.4 mM N) this fungus produced three major classes of extracellular lignin-modifying enzymes (LMEs): manganese-dependent peroxidase (MNP), lignin peroxidase (LIP), and laccase. Low MNP and laccase activities were seen in high-nitrogen medium (24 mM N), but no LIP activity was seen. In media containing lignocellulosic substrates such as pine, poplar, or sugarcane bagasse as the sole source of carbon and nitrogen, relatively high MNP and moderate levels of laccases were seen, but LIP production either was not seen or was minimal. LME production was also seen in media prepared with artificial seawater. Fast protein liquid chromatography and isoelectric focusing resolved LMEs into four isozymes each of MNP and LIP, while laccase isozymes were resolved into two groups, one group containing seven isozymes (pIs 4 to 6) and the other group containing at least three isozymes (pIs < 3). The molecular masses of the different isozymes were 43 to 99 kDa for MNP, 40 and 41.5 kDa for LIP, and 43 and 99 kDa for laccase. F. flavus showed effective degradation of various dye pollutants in media prepared with or without artificial seawater. This is the first report on the production of all three major classes of LMEs by F. flavus and points to the bioremediation potential of this organism in terrestrial as well as marine environments.
Authors:
Raghukumar; D'Souza; Thorn; Reddy
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Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  Applied and environmental microbiology     Volume:  65     ISSN:  1098-5336     ISO Abbreviation:  Appl. Environ. Microbiol.     Publication Date:  1999 May 
Date Detail:
Created Date:  1999-05-05     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7605801     Medline TA:  Appl Environ Microbiol     Country:  -    
Other Details:
Languages:  Eng     Pagination:  2103-11     Citation Subset:  -    
Affiliation:
Department of Microbiology and NSF Center for Microbial Ecology, Michigan State University, East Lansing, Michigan 48824-1101, USA.
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