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Laboratory Screening Protocol to Identify Novel Oleaginous Yeasts
IR. Sitepu, AL. Garay, T. Cajka, O. Fiehn, KL. Boundy-Mills,
Jazyk angličtina Země Spojené státy americké
Typ dokumentu časopisecké články, Research Support, N.I.H., Extramural, práce podpořená grantem
- MeSH
- barvení a značení metody MeSH
- chromatografie kapalinová metody MeSH
- fluorescenční barviva analýza MeSH
- fluorescenční mikroskopie metody MeSH
- hmotnostní spektrometrie metody MeSH
- kvasinky chemie MeSH
- lipidomika metody MeSH
- lipidy analýza MeSH
- oxaziny analýza MeSH
- triglyceridy analýza MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Research Support, N.I.H., Extramural MeSH
Oleaginous microbes, which contain over 20% intracellular lipid, predominantly triacylglycerols (TG), by dry weight, have been discovered to have high oil content by many different protocols, ranging from simple staining to more complex chromatographic methods. In our laboratory, a methodical process was implemented to identify high oil yeasts, designed to minimize labor while optimizing success in identifying high oil strains among thousands of candidates. First, criteria were developed to select candidate yeast strains for analysis. These included observation of buoyancy of the yeast cell mass in 20% glycerol, and phylogenetic placement near known oleaginous species. A low-labor, semiquantitative Nile red staining protocol was implemented to screen numerous yeast cultures for high oil content in 96-well plates. Then, promising candidates were selected for more quantitative analysis. A more labor-intensive and quantitative gravimetric assay was implemented that gave consistent values for intracellular oil content for a broad range of yeast species. Finally, an LC-MS protocol was utilized to quantify and identify yeast triacylglycerols. This progressive approach was successful in identifying 30 new oleaginous yeast species, out of over 1000 species represented in the Phaff Yeast Culture Collection.
Citace poskytuje Crossref.org
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