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Modification of substrate specificity of thioesterase, reductase, desaturase by MALDI-tof-MS analysis of microbial colonies
Choe, Kisurb
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https://hdl.handle.net/2142/117595
Description
- Title
- Modification of substrate specificity of thioesterase, reductase, desaturase by MALDI-tof-MS analysis of microbial colonies
- Author(s)
- Choe, Kisurb
- Issue Date
- 2022-12-02
- Director of Research (if dissertation) or Advisor (if thesis)
- Sweedler, Jonathan
- Doctoral Committee Chair(s)
- Sweedler, Jonathan
- Committee Member(s)
- Nair, Satish
- Procko , Erik
- Zhao, Huimin
- Department of Study
- Biochemistry
- Discipline
- Biochemistry
- Degree Granting Institution
- University of Illinois at Urbana-Champaign
- Degree Name
- Ph.D.
- Degree Level
- Dissertation
- Keyword(s)
- Enzymes
- mass spectrometry
- MALDI-MS
- Abstract
- Chemical heterogeneity in biological systems reveal important clues to the inner workings of the fundamental processes such as lipid metabolism and physiology. High throughput screening of microbes and mutant libraries resolve such complexities enabling multiple biochemical studies such as directed evolution, functional genomics, microbial identification, and genome mining. A promising screening approach is measurement of biochemical products directly from microbial colonies via optically guided matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS). Measuring the compounds from microbial colonies bypasses liquid culture while minimizing the automation processes, and the wide chemical coverage and the high sensitivity of MALDI-MS can enable diverse biochemical screening projects such as modifying enzymes and functional genomics survey of gene activation/inhibition libraries. The thesis first presents the informatics and the experimental methods that were created to develop the MALDI-MS based colony screen. The macroMS software was developed to perform informatics tasks such as image analysis finding samples, MALDI-MS automation targeting the samples, and data analysis / visualization to find an analyte of interest. Then an experimental method for colony sample preparation, constructing sprayer for applying MALDI matrix, and running MALDI-MS is described. Based on the colony screening method, random libraries of an acyl-ACP thioesterase, an acyl-ACP desaturase, an acyl-CoA reductase were scanned, revealing novel variants with increased specificity for specific products.
- Graduation Semester
- 2022-12
- Type of Resource
- Thesis
- Copyright and License Information
- Copyright 2022 Kisurb Choe
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