Abstract:
:We have isolated and characterized the cDNA and genomic DNA coding for a phenoloxidase, laccase I, previously purified from culture supernatant of the newly isolated ligninolytic basidiomycete PM1 (CECT 2971). A cDNA library from basidiomycete PM1 was constructed, and laccase-encoding cDNAs were identified by screening with antiserum raised against the purified enzyme. The lac1 gene coding for the laccase was identified in a partial genomic library by using the isolated cDNA as a probe. Nucleotide sequence determination of the full-length cDNA revealed an open reading frame of 1,551 bp encoding a polypeptide of 517 amino acid residues with a putative signal peptide of 21 amino acid residues. Ten small introns interrupted the genomic DNA. A single 1.8-kb transcript mRNA was detected by Northern (RNA) blot analysis, and its 5' end maps to a position 51 bp upstream from the site of initiation of protein synthesis. Eukaryotic regulatory sequences, CAAT and TATA, were observed in the 5' flanking region, which also contains sequences similar to those of copper-regulated proteins. Comparative analysis of the predicted amino acid sequence showed that basidiomycete PM1 laccase I had great similarity to the laccases from Coriolus versicolor, Coriolus hirsutus, and Phlebia radiata.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Coll PM,Tabernero C,Santamaría R,Pérez Pdoi
10.1128/AEM.59.12.4129-4135.1993subject
Has Abstractpub_date
1993-12-01 00:00:00pages
4129-35issue
12eissn
0099-2240issn
1098-5336journal_volume
59pub_type
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