Abstract
Partial purification of β-galactosidase from the crude extract of Kluyveromyces lactis was carried out using water-in-isooctane microemulsions formed by the anionic surfactant, sodium di-ethylhexyl sulfosuccinate (Aerosol OT). In order to obtain the crude extract, yeast cells of K. lactis were disrupted by a cell disrupter and separated. The purification of β-galactosidase from the extract by a recently developed one-step reversed micellar (i.e., microemulsion-based) extraction method was then tested, by measuring total protein mass and enzyme activity in the product stream and by analyzing its composition using sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and gel filtration chromatography. Effects of salt concentration, protein concentration, and pH on the extraction were investigated. Using this approach, a 5.4-fold purification of β-galactosidase was achieved with 96 % total activity recovery, using a feed containing crude extract and 50 mM K-phosphate buffer (pH 7.5) and 50 mM KCl. Gel filtration chromatography showed that the single extraction was successful at removing low molecular weight impurity proteins (molecular weight (MW) < 42 kDa) from the crude extract.
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Acknowledgments
Maxilact LX-5000 was a generous gift from DSM Food Specialties. Bekir G. Mazı is indebted to the Scientific and Technical Research Council of Turkey (Grant TUBITAK-BIDEB-2214) for the fellowship. This research was funded by grant METU-BAP-08-11-DPT.2002K120510 (Turkey) and TUBITAK-TOVAK-108O823 and seed grants from the UC Davis Robert Mondavi Institute and University Outreach and International Programs.
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Mazı, B.G., Hamamcı, H., Ogrydziak, D.M. et al. Single-Step Partial Purification of Intracellular β-Galactosidase from Kluyveromyces lactis Using Microemulsion Droplets. Appl Biochem Biotechnol 180, 1000–1015 (2016). https://doi.org/10.1007/s12010-016-2148-y
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DOI: https://doi.org/10.1007/s12010-016-2148-y