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- 저자 : Jian-she Ma (검색결과 2 건)
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A newly characterized exopolysaccharide from Sanghuangporus sanghuang
Xiao-kui Ma,Xu She,Eric Charles Peterson,Yu Zhen Wang,Peng Zheng,Hongyan Ma,Kexin Zhang,Jian Liang 한국미생물학회 2019 The journal of microbiology Vol.57 No.9
Sanghuangporus sanghuang is a well-known pharmacodynamic and economically important edible fungus associated with mulberry (Morus spp.). A distinctly new exopolysaccharide (EPS), designated SHP-2 was obtained from S. sanghuang P0988 broth, and its structure and anti-aging prosperity were characterized. SHP-2 was found to be composed of a backbone of 4)-β-Manp-(1 4)-α-Araf-(1 3,4)-α-Glcp(1 3,4)-α-Glcp-(1 3,4)-α-Glcp-(1 3,4)-α-Glcp-(1 3,4)-α- Glcp-(1 6)-α-Galp-(1 4)-β-Manp-(1 and five branches, including four α-D-Glcp-(1 and one α-D-Manp-(1 SHP-2 was shown to increase antioxidant enzyme activities including catalase (CAT) and superoxide dismutase (SOD) activities, as well as trolox equivalent antioxidant (TEAC) capacity in serum of mice pre-treated with D-Gal, while reducing lipofuscin levels. SHP-2 exerted a favorable influence on immune organ coefficients and ameliorated the histopathological hepatic lesions and apoptosis in hepatocytes of Dgalactose- aged mice almost in a dose-dependent manner. Using the same analytical methods, on comparison with previously studied EPS compounds (i.e. SHP-1), SHP-2 was found to have more complex structure, larger molecule weight, and different anti-aging properties. The results presented here suggest that not only does EPS bioactivity vary with respect to molecular structures and molecule weight, but that multiple structures with different activity can be expressed by a single fungal strain. These results may help understanding the antiaging prosperity of these polysaccharides for use in health foods or dietary supplements.
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A κ-Carrageenase from a Newly Isolated Pseudoalteromonas-like Bacterium, WZUC10
Mao-hong Zhou,Jian-she Ma,Jun Li,Hai-ren Ye,Ke-xin Huang,Xiao-wei Zhao 한국생물공학회 2008 Biotechnology and Bioprocess Engineering Vol.13 No.5
A bacterial strain able to produce k-carrageenase, designated WZUC10, was isolated from a live specimen of the red alga Plocamium telfairiae collected in the East China Sea. The phylogenetic evidence and phenotypic features indicate that this strain belongs to the genus Pseudoalteromonas. WZUC10 requires NaCl for growth and k-carrageenan to induce k-carrageenase synthesis; galactose and lactose do not induce it. The optimal growth temperature is 23~27°C. The secreted enzyme, which has a molecular mass of 45 kDa, breaks down k-carrageenan into k-neocarratetraose sulfate and larger oli-gosaccharides with a repeating β-D-Galp4S-(1→4)-α-D-AnGalp structure, but cannot degrade k-neocarratetraose sulfate or k-neocarrahexaose sulfate into k-neocarrabiose sulfate. The enzyme retains 90% of its activity after 2 h at 40°C and is com-pletely inactivated after 7.5 min at 70°C. The enzyme’s optimal temperature is 30°C and its optimal pH is 7.5. The enzyme-catalyzed reaction follows Michaelis-Menten kinetics, with the Michaelis constant (Km) and the turnover number (k) being 0.015 mM and 125 s-¹, respectively. WZUC10 produces 50 U/mL k-carrageenase after cultivation at 25°C for 35 h on a me-dium containing 80 g/L glucose, 5 g/L corn steep liquor, 3 g/L k-carrageenan, and 15 g/L NaCl. k-Neocarratetraose sulfate was prepared simply with precipitation by ethanol:water (5:1, v/v).
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