Abstract:
:Laccase is one of the lignolytic enzymes found in liquid cultures of the fungus Coriolus zonatus in defined medium. The enzyme was isolated from culture liquid and characterized. Laccase from C. zonatus is a single-chain protein with a molecular mass of 60 kDa. Carbohydrate moiety of enzyme consisted of mannose, galactose and N-acetyl-glucosamine in a ratio of 6:2:0.6, respectively, and comprised 10% of the entire molecule. Isoelectric point was detected at pH 4.6. Laccase was found to have a pH optimum of 4.9 and temperature optimum of 55 degrees C. Substrate specificity studies were conducted with catechol, K-ferrocyanide, hydroquinone, and sinapinic acid as substrates. The highest efficiency of catalysis was observed with sinapic acid as the substrate. The kinetic constants kcat and Km of this reaction were 624 s-1 and 7 microM, respectively.
journal_name
Appl Biochem Biotechnoljournal_title
Applied biochemistry and biotechnologyauthors
Koroljova OV,Stepanova EV,Gavrilova VP,Biniukov VI,Jaropolov AI,Varfolomeyev SD,Scheller F,Makower A,Otto Adoi
10.1385/abab:76:2:115subject
Has Abstractpub_date
1999-02-01 00:00:00pages
115-27issue
2eissn
0273-2289issn
1559-0291pii
ABAB:76:2:115journal_volume
76pub_type
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