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Author: search.filters.author.Phuengjayaem, SukanyaSubject: search.filters.subject.Biosynthetic pathway

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    Item type:Publication,
    Astaxanthin producing yeasts: Production and genomic analysis
    (2024-09-16)
    Kingkaew, Engkarat
    ;
    Phuengjayaem, Sukanya
    ;
    Tanasupawat, Somboon
    This chapter explores yeasts and their potential in carotenoid production, delving into the diverse roles of carotenoids, their biosynthesis, and applications. Carotenoids, found in various organisms, serve several crucial functions, including light harvesting, photoprotection, and antioxidant activity. The focus shifts to astaxanthin, a red-orange carotenoid with immense market value and applications, notably in aquaculture and health. The astaxanthin-producing yeast strains emerge as a promising biotechnological platform for carotenoid production, particularly astaxanthin. Its unique features, FDA approval, and ability to synthesize carotenoids make it an ideal candidate for industrial applications. This chapter details the structure of astaxanthin and its biosynthetic pathway, emphasizing key genes involved. Additionally, it highlights other carotenoid producers and the biochemistry of astaxanthin. The latter part focuses on the health-promoting effects of astaxanthin, including antioxidant, anti-inflammatory, anti-diabetic, and anticancer activities. Immunomodulation benefits and the safety profile of astaxanthin are also discussed. The chapter concludes by addressing current trends, perspectives, and challenges in astaxanthin production, emphasizing the importance of circular, zero-waste processes.
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    Diversity, astaxanthin production, and genomic analysis of Rhodotorula paludigena SP9-15
    (2023-07-01)
    Phuengjayaem, Sukanya
    ;
    Kingkaew, Engkarat
    ;
    Hoondee, Patcharaporn
    ;
    Rojsitthisak, Pornchai
    ;
    Sritularak, Boonchoo
    Astaxanthin is a carotenoid known for its powerful antioxidant properties. This study focused on isolating yeast strains capable of producing astaxanthin from flower and fruit samples collected in Thailand. Out of 115 isolates, 11 strains were identified that produced astaxanthin. Molecular identification techniques revealed that these isolates belonged to two species: Rhodotorula paludigena (5 isolates) and Rhodosporidiobolus ruineniae (6 isolates). Whole-genome analysis of one representative strain, R. paludigena SP9-15, identified putative candidate astaxanthin synthesis-associated genes, such as CrtE, CrtYB, CrtI, CrtS, CrtR, CrtW, CrtO, and CrtZ. High-performance liquid chromatography (HPLC) and liquid chromatography-mass spectrometry (LC-MS) confirmed astaxanthin production. Further optimization of astaxanthin production was carried out by investigating the effects of various factors on the growth rate and astaxanthin production. The optimal conditions were 40 g/L glucose as a carbon source, pH 7.5, and cultivation at 25 °C with 200 rpm for 3 days. Under these conditions, R. paludigena SP9-15 synthesized biomass of 11.771 ± 0.003 g/L, resulting in astaxanthin with a content of 0.558 ± 0.018 mg/g DCW (dry cell weight), an astaxanthin yield of 6.565 ± 0.238 mg/L, and astaxanthin productivity of 2.188 ± 0.069 g/L/day. These findings provide insights into astaxanthin production using red yeast strains from Thailand and highlight the potential of R. paludigena SP9-15 for further application.