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Protoplast preparation and polyethylene glycol (PEG)-mediated transformation of Candida glycerinogenes

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Abstract

The regeneration of Candida glycerinogenes protoplasts is a major step following genetic manipulations such as fusion and DNA-mediated transformation. An investigation of protoplast formation and cytological examination was used to gain further insight into the loss of protoplast viability in osmotically stabilized support media. Protoplasts with the highest regeneration frequency (98.6% protoplasts/mL) were isolated, using lysozyme dissolved in 1M sorbitol osmoticum. The commercial enzyme preparations, osmotic stabilisers, and growth phase were effective in raising the protoplast yield. Sodium chloride was effective for protoplast preparation; however, sugars and sugar alcohols were better for protoplast regeneration. Sorbitol at a concentration of 1 M was used in regeneration agar for further studies. Regeneration of colonies from protoplasts was maximal (11 ~ 15%) when protoplasts were incorporated in cooled agar containing 0.5% glucose, supplemented with 1M sorbitol as osmotic stabilizer. C. glycerinogenes strain was highly sensitive to zeocin, so transformation of protoplasts and PEG-mediated was achieved with an improved transformation system, using plasmid pURGAP-gfp containing zeocin gene driven by a PCgGAP promoter from C. glycerinogenes to express gfp gene and be transformed into the 5.8S rDNA site of C. glycerinogenes in order to test the system for studying the yeast osmoregulation. We developed an efficient method for transformation of C. glycerinogenes, and parameters involved in transformation efficiency were optimized. Expressions of gfp at different levels were conducted under osmotic stress containing NaCl, KCl, sorbitol or glycerol for the recombinant strains. These improved procedures for protoplast isolation, regeneration and transformation proved to be useful applications in genetic studies for other Candida species and industrial yeast.

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Authors and Affiliations

  1. The Key Lab of Industrial Biotechnology of Ministry of Education, Research Centre of Industrial Microorganisms, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu, 214-122, China

    Cheng Zhang, Hong Zong, Bin Zhuge, Xinyao Lu, Huiying Fang, Jiali Zhu & Jian Zhuge

  2. Zhejiang Condiments Industry Research Center, Zhejiang Zhengwei Food Co., Ltd, Yiwu, 321-000, China

    Bin Zhuge

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  1. Cheng Zhang
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  2. Hong Zong
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  3. Bin Zhuge
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  7. Jian Zhuge
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Correspondence to Bin Zhuge.

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Zhang, C., Zong, H., Zhuge, B. et al. Protoplast preparation and polyethylene glycol (PEG)-mediated transformation of Candida glycerinogenes . Biotechnol Bioproc E 21, 95–102 (2016). https://doi.org/10.1007/s12257-015-0686-8

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  • DOI: https://doi.org/10.1007/s12257-015-0686-8

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