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Master's Dissertation
DOI
https://doi.org/10.11606/D.87.2011.tde-22032011-174630
Document
Author
Full name
Mariana Rangel Pereira
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2011
Supervisor
Committee
Lemos, Eliana Gertrudes Macedo (President)
Gomes, Eleni
Pellizari, Vivian Helena
Title in Portuguese
Prospecção de genes codificadores de enzimas lipolíticas em biblioteca metagenômica de consórcio microbiano degradador de óleo diesel.
Keywords in Portuguese
Enzimas lipolíticas
Genética bioquímica
genomas
Lipase
Sequência do DNA
Abstract in Portuguese
As enzimas lipolíticas vêm atraindo atenção no mercado global devido ao enorme potencial biotecnológico, como: na formulação de detergentes; na indústria de couro; produção de cosméticos, fármacos, aromas, biodiesel, etc. O objetivo deste trabalho foi prospectar genes codificadores de enzimas lipolíticas em biblioteca metagenômica de um consórcio microbiano degradador de óleo diesel. A seleção foi feita pela atividade lipolítica através do cultivo dos clones em placa de petri e a avaliação foi pela observação de halo ao redor da colônia, sendo positiva para 30 clones dentre os quais dois se destacaram. Estes dois clones foram selecionados e subclonados. Os DNAs das sub-bibliotecas foram sequenciados, gerando um contig completo para cada clone. Através do ORF Finder foi identificado cinco ORFs de esterase/lipase, dentre as quais uma alcançou 58% de identidade com uma bactéria não cultivável. As árvores filogenéticas indicam que duas ORFs são similares à família IV das enzimas lipolíticas, enquanto que as outras três ORFs à família V.
Title in English
Screening for lipolytic enzyme codification genes in a metagenomic library of consortia specialized in diesel oil degradation.
Keywords in English
Biochemical genetics
DNA sequence
Genomes
Lipase
Lipolytic enzymes
Abstract in English
Lipolytic enzymes have been attracting global market attention because they show enormous biotechnological potential. The present work was done as an attempt to find genes which codify lipolytic enzymes in a metagenomic library composed of diesel oil degradation microbe consortia. Clones were selected according to lipolytic activity and were then evaluated after cultivation in Petri dishes by observation of halo formation around the colonies. 30 clones produced halo formations and were identified as positives, two of which showed prominent results. These two were then selected and sub cloned. DNA from the sub libraries was sequenced, generating a complete contig for each clone. Using the ORF Finder five esterase/lipase ORFs were identified, with one of these attaining 58% of identity to a non cultivatable bacteria species. Assessment of the cladograms showed that two ORFs were similar to lipolytic enzyme family IV, while the other three ORFs were similar to family V.
 
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Publishing Date
2011-08-16
 
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