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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2015.tde-26082015-142939
Document
Author
Full name
Juliano Cherix
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2015
Supervisor
Committee
Silva, Luiziana Ferreira da (President)
Baldini, Regina Lúcia
Fernandes, Andrea Balan
Title in Portuguese
Avaliação de genes para o catabolismo de xilose e seu potencial para geração de bioprodutos.
Keywords in Portuguese
Burkholderia sacchari
P3HB
Polihidroxialcanoatos
Via isomerase
Xilose
Xilose isomerase
Abstract in Portuguese
A xilose é um dos principais componentes dos materiais lignocelulósicos, os quais são de grande interesse para produção de bioprodutos como etanol e polihidroxialcanoatos (PHA). Visando melhorar o consumo de xilose em Burkholderia sacchari, uma grande produtora de PHA, os seguintes genes codificadores de xilose isomerase foram nela inseridos e avaliados: xylABs, xylABc, xylAPl, xylABp e xylABx, respectivamente de B. sacchari, B. cenocepacia, Photorhabdus luminescens, B. phymatum e B. xenovorans. Foi ainda sintetizado o gene de B. sacchari (xylA*) no qual foram inseridas modificações descritas na literatura como capazes de aumentar o consumo de xilose em outros organismos. As linhagens recombinantes de B. sacchari abrigando os genes xylABs e xylA* tiveram um aumento de aproximadamente 30%, e aquelas abrigando os genes xylABp e xylABx de 23%, no consumo de xilose quando comparadas com a linhagem controle. Essas quatro linhagens recombinantes foram aquelas que conseguiram produzir maior quantidade de P3HB, aproximadamente 70% a mais do que linhagem controle.
Title in English
Evaluation of xylose catabolism genes and their potential for the generation of bioproducts.
Keywords in English
Burkholderia sacchari
Isomerase pathway
P3HB
Polyhydroxyalkanoates
Xylose
Xylose isomerase
Abstract in English
Xylose is a major component of lignocellulosic materials, which are of great interest for the production of bio-products, such as ethanol and polyhydroxyalkanoates (PHA). To improve the consumption of xylose in Burkholderia sacchari, a major PHA producer, the following genes, encoding xylose isomerase, were introduced in these bacteria: xylABs, xylABc, xylAPl, xylABp and xylABx, respectively from B. sacchari, B. cenocepacia, Photorhabdus luminescens, B. phymatum e B. xenovorans. The gene of B. sacchari (xylA*) was also synthesized with several modifications described in the literature as able to increase the consumption of xylose in other organisms. Recombinant strains harboring B. sacchari xylABs and xylA* gene had an increase of approximately 30% in the xylose consumption compared to the control strain, and those harboring xylABx and xylABp gene an increase of 23%. These four recombinant strains were those that were able to produce more P3HB, approximately 70% more than the control strain.
 
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Publishing Date
2015-08-28
 
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