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Master's Dissertation
DOI
https://doi.org/10.11606/D.87.2011.tde-15092011-151851
Document
Author
Full name
Thais Carvalho Maester
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2011
Supervisor
Committee
Lemos, Eliana Gertrudes Macedo (President)
Juliano Neto, Luiz
Mui, Tsai Siu
Title in Portuguese
Prospecção de sequências genômicas codificadoras de enzimas lipolíticas degradadoras de hidrocarbonetos de petróleo.
Keywords in Portuguese
Enzimas hidrolíticas
Hidrocarbonetos
Lipase
Patente
Petróleo
Sequência do DNA
Abstract in Portuguese
Enzimas lipolíticas possuem enorme potencial biotecnológico. O objetivo foi prospectar genes para a codificação de enzimas lipolíticas em biblioteca metagenômica com 4224 clones. A atividade lipolítica foi avaliada pela formação de halo ao redor das colônias através do cultivo dos clones em meio de cultura suplementado com tributirina, sendo positiva para 30 clones, e dois foram selecionados e tiveram o DNA sub-clonado. Os DNAs das sub-bibliotecas foram sequenciados, gerando um contig completo para o clone PL28.F10, que foi comparado com as sequências do banco NCBI. Uma ORF codificadora de esterase/lipase de 303 aminoácidos e 61% de identidade com micro-organismo não cultivável foi encontrada. Árvores filogenéticas indicam que o clone possui a ORF15 mais próxima da família IV das esterases/lipases. Foi possível identificar os sítios ativos representativos da família, confirmando o resultado das árvores filogenéticas. Com sequências já patenteadas, a ORF15 é um grupo irmão das sequências de esterases/lipases da BASF e de uma proteína não identificada da CAMBIA.
Title in English
Screening for genomic sequences which codify lipolytic enzymes specialized in petroleum hydrocarbons degradation.
Keywords in English
DNA sequence
Hydrocarbons
Hydrolytic enzymes
Lipase
Oil
Patent
Abstract in English
Lipolytic enzymes have show enormous biotechnological potential. The work was done to find genes which codify lipolytic enzymes in a metagenomic library with 4224 clones. Clones were selected according to lipolytic activity and were assessed by cultivation in medium supplemented with tributyrin. Assessment was done by observation of halos formed around the colonies, with 30 clones producing halos. Of these, two were selected. DNA from the sub libraries was sequenced, generating a complete contig for clone PL28.F10 that was compared to sequences from the NCBI. An ORF of 303 amino acids with 61% of identity with uncunturable microorganism were found. The clone presented the ORF15 similar to that of lipolytic enzyme family IV. The alignments made possible the identification of active sites which represent the family, confirming the results obtained with the construction of the cladograms. The ORF15 showed similarities to patented BASF esterase/lipase and an unnamed protein of CAMBIA.
 
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Publishing Date
2011-09-22
 
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