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DNA sequence analysis of endoglucanase genes from Pseudomonas fluorescens subsp. cellulosa and Pseudomonas sp. NCIB 8634


DNA sequence analysis of endoglucanase genes from Pseudomonas fluorescens subsp. cellulosa and Pseudomonas sp. NCIB 8634



Journal of Industrial Microbiology 6(4): 285-290



ISSN/ISBN: 0169-4146

PMID: 1366996

The DNA of two previously isolated recombinant clones, one from Pseudomonas sp. NCIB 8634 (= Cellvibrio mixtus) (pPC71) and another from Pseudomonas fluorescens subsp. cellulosa (pPFC4) that express endoglucanase activity in Escherichia coli was sequenced. Plasmid pPC71 had three open reading frames, two of which include portions of plamsid pbR322. The third open reading frame occurs entirely within the Pseudomonas DNA insert and encodes a protein with a molecular mass of 5845 Da. The DNA insert in pPFC4 was found to contain an open reading frame (PFC-ORF) that encodes a protein of 32189 Da. The major endoglucanase produced in Escherichia coli cells carrying pPFC4 is about 30,000 Da [26]. It is concluded that PFC-ORF encodes this endoglucanase. Both ribosome and catabolite gene activator protein binding sites lie upstream from the initiating codon of PFC-ORF. An interesting feature of the PFC-ORF protein is the presence of amino acid motifs Val-Ser-Ser-Ser-Ser and Val-Val-Ser-Ser-Ser-Ser-Ser that occur within a 25 amino acid span.

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Accession: 007225050

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