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A Strongly Fluorescing Anaerobic Reporter and Protein-Tagging System for Clostridium Organisms Based on the Fluorescence-Activating and Absorption-Shifting Tag Protein (FAST)

Journal Article · · Applied and Environmental Microbiology
DOI:https://doi.org/10.1128/aem.00622-19· OSTI ID:1613137
 [1];  [2];  [3]
  1. Univ. of Delaware, Newark, DE (United States); Delaware Biotechnology Inst., Newark, DE (United States); DOE/OSTI
  2. Delaware Biotechnology Inst., Newark, DE (United States); Univ. of Delaware, Newark, DE (United States)
  3. Univ. of Delaware, Newark, DE (United States); Delaware Biotechnology Inst., Newark, DE (United States)
Visualizing protein localization and characterizing gene expression activity in live Clostridium cells is limited for lack of a real-time, highly fluorescent, oxygen-independent reporter system. Enzymatic reporter systems have been used successfully for many years with Clostridium spp.; however, these assays do not allow for real-time analysis of gene expression activity with flow cytometry or for visualizing protein localization through fusion proteins. Commonly used fluorescent reporter proteins require oxygen for chromophore maturation and cannot be used for most strictly anaerobic Clostridium organisms. Here we show that the fluorescence-activating and absorption-shifting tag protein (FAST), when associated with the fluorogenic ligand 4-hydroxy-3-methylbenzylidene-rhodanine (HMBR; now commercially available) and other commercially available ligands, is highly fluorescent in Clostridium acetobutylicum under anaerobic conditions. Using flow cytometry and a fluorescence microplate reader, we demonstrated FAST as a reporter system by employing the promoters of the C. acetobutylicum thiolase (thl), acetoacetate decarboxylase (adc), and phosphotransbutyrylase (ptb) metabolic genes, as well as a mutant Pthl and modified ribosome binding site (RBS) versions of Padc and Pptb. Flow cytometry-based sorting was efficient and fast in sorting FAST-expressing cells, and positively and negatively sorted cells could be effectively recultured. FAST was also used to tag and examine protein localization of the predicted cell division FtsZ partner protein, ZapA, to visualize the divisome localization in live C. acetobutylicum cells. Our findings suggest that FAST can be used to further investigate Clostridium divisomes and more broadly the localization and expression levels of other proteins in Clostridium organisms, thus enabling cell biology studies with these organisms.
Research Organization:
Univ. of Delaware, Newark, DE (United States)
Sponsoring Organization:
Army Research Office (ARO); National Institutes of Health (NIH); National Science Foundation (NSF); USDOE Office of Science (SC)
Grant/Contract Number:
SC0019155
OSTI ID:
1613137
Journal Information:
Applied and Environmental Microbiology, Journal Name: Applied and Environmental Microbiology Journal Issue: 14 Vol. 85; ISSN 0099-2240
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English

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