Evidence for the role of zinc on the performance of dibenzothiophene desulfurization by <Emphasis Type="Italic">Gordonia alkanivorans</Emphasis> strain 1B |
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Authors: | Luís Alves José Matos Rogério Tenreiro Francisco M Gírio |
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Institution: | 1.INETI, Departamento de Biotecnologia,Lisbon,Portugal;2.FCUL, Departamento de Biologia Vegetal,Centro de genética e Biologia Molecular,Lisbon,Portugal |
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Abstract: | Gordonia alkanivorans strain 1B is able to desulfurize dibenzothiophene (DBT) to 2-hydroxybiphenyl (2-HBP), the final product of the 4S pathway.
However, both the cell growth and the rate of desulfurization can be largely affected by the nutrient composition of the growth
medium due to cofactor requirements of many enzymes involved in the biochemical pathways. In this work, the effect of several
metal ions on the growth and DBT desulfurization by G. alkanivorans was studied. From all the metal ions tested, only the absence of zinc significantly affected the cell growth and the desulfurization
rate. By increasing the concentration of Zn from 1 to 10 mg L−1, 2-HBP productivity was improved by 26%. The absence of Zn2+, when sulfate was also used as the only sulfur source, did not cause any difference in the bacterial growth. Resting cells
grown in the presence of Zn2+ exhibited a 2-HBP specific productivity of 2.29 μmol g−1 (DCW) h−1, 7.6-fold higher than the specific productivity obtained by resting cells grown in the absence of Zn2+ (0.30 μmol g−1 (DCW) h−1). These data suggests that zinc might have a key physiological role in the metabolism of DBT desulfurization. |
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Keywords: | Dibenzothiophene Biodesulfurization Gordonia alkanivorans Zinc Enzyme cofactors |
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