Generation and Characterization of dszB mutants from Nocardia asteroides A3H1
dc.contributor.advisor | Watkins, Linette M. | |
dc.contributor.author | Scott, Christopher A. | |
dc.date.accessioned | 2020-09-02T14:36:06Z | |
dc.date.available | 2020-09-02T14:36:06Z | |
dc.date.issued | 2003-08 | |
dc.description.abstract | Dibenzothiophene, a model compound for sulfur-containing organic molecules found in fossil fuels, can be desulfurized to 2-hydroxybiphenyl by Nocardia asteroides sp. strain A3H1 (A3H1) using the “4S” desulfurization pathway. In the final and rate-limiting step of this pathway, the DszB enzyme catalyzes the hydrolysis of 2-(2’- hydroxyphenyl) benzenesulfinate to form inorganic sulfur and 2-hydroxybiphenyl. The wildtype dszB gene from A3H1 was successfully cloned into the pBAD TOPO® and pBAD TOPO®/ThioFusion expression vectors. Cloning efficiency of the wildtype gene into the pBAD TOPO® vector was 86%. The in vitro directed evolution of DszB was initiated using error-prone PCR. An asexual dszB mutant library was generated and sixty mutant genes were characterized. The average mutation rate of the dszB gene was determined to be 0.75% ± 0.84. Attempts at overexpressing the mutant genes were unsuccessful and no measurable induction of fusion protein expression was observed upon arabinose addition. | |
dc.description.department | Chemistry and Biochemistry | |
dc.format | Text | |
dc.format.extent | 79 pages | |
dc.format.medium | 1 file (.pdf) | |
dc.identifier.citation | Scott, C. A. (2003). Generation and characterization of dszB mutants from Nocardia asteroides A3H1 (Unpublished thesis). Southwest Texas State University, San Marcos, Texas. | |
dc.identifier.uri | https://hdl.handle.net/10877/12523 | |
dc.language.iso | en | |
dc.subject | desulfurization | |
dc.subject | Nocardia | |
dc.subject | petroleum products | |
dc.title | Generation and Characterization of dszB mutants from Nocardia asteroides A3H1 | |
dc.type | Thesis | |
thesis.degree.department | Chemistry and Biochemistry | |
thesis.degree.grantor | Southwest Texas State University | |
thesis.degree.level | Masters | |
thesis.degree.name | Master of Science |
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