Cloning and overexpression of the xylose isomerase gene from Burkholderia sacchari and production of polyhydroxybutyrate from xylose.
A different organization for the xyl operon was found in different genomes of Burkholderia and Pseudomomas species. Degenerated primers were designed based on Burkholderia genomes and used to amplify the xylose isomerase gene (xylA) from Burkholderia sacchari IPT101. The gene encoded a protein of 329 amino acids, which showed the highest similarity (90%) to the homologous gene of Burkholderia dolosa. It was cloned in the broad host range plasmid pBBR1MCS-2, which partially restored growth and polyhydroxybutyrate production capability in xylose to a B. sacchari xyl- mutant. When xylA was overexpressed in the wild-type strain, it was not able to increase growth and polyhydroxybutyrate production, suggesting that XylA activity is not limiting for xylose utilization in B. sacchari.
Lopes
Mateus Schreiner Garcez
MS
Department of Microbiology, University of Sao Paulo, Cidade Universitária, CEP, SP, Brazil.
Gomez
José Gregório Cabrera
JG
Silva
Luiziana Ferreira
LF
D019747:Aldose-Ketose Isomerases / Q000235:genetics* / Q000378:metabolism; D019117:Burkholderia / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development; D003001:Cloning, Molecular; D015964:Gene Expression Regulation, Bacterial; D015971:Gene Expression Regulation, Enzymologic; D006885:Hydroxybutyrates / Q000378:metabolism*; D009876:Operon; D014994:Xylose / Q000378:metabolism*
D006885:Hydroxybutyrates; D014994:Xylose; D019747:Aldose-Ketose Isomerases; C023298:xylose isomerase