Ya-xin Zhu

Publications (2)0 Total impact

• Article: [Construction and analysis of rumen bacterial artificial chromosome library from a dairy cow rumen microflora].

  Ya-xin Zhu, Jia-qi Wang, Run-lin Ma, Li Huang, Zhi-yang Dong
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  ABSTRACT: The high molecular weight DNA was extracted and purified directly from rumen samples in the study by using culture-independent and pulsed field gel electrophoresis approaches. After digestion with Hind III, DNA fragments ranging from 50-100 kb was collected and ligated to pCC BAC vector. The ligation mixture was transformed into E. coli EPI300 and a rumen metagenomic BAC library with about 15360 clones was constructed. The average insert size is about 54.5 kb, mostly ranging from 50-70 kb, and the capacity of this BAC library is about 837Mb. Several BAC clones with activity of amylase, Cmcellulase had been screened from the BAC library. The clones with Cmcelluase activity were screened further for linchenase, xylanase, cellobioase activity and the result is that 25 of them have at least one kind of other enzyme activity.
  ACTA MICROBIOLOGICA SINICA 05/2007; 47(2):213-6.
• Article: [Expression of B-glucosidase gene of Sacchromycopsis fibuligera in Pichia pastoris].

  Jin-hui Shao, Yun Zhao, Ai-jun Mao, Ya-xin Zhu, Zhi-yang Dong, Ning Jiang
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  ABSTRACT: A beta-Glucosidase gene (BGL 1) was amplified with PCR from the total DNA of Sacchromycopsis fibuligera, and was linked with pGEM-T vector. After cut down by restriction enzyme from pGEM-T vector, BGL 1 was inserted into the expression vector pPIC9K of Pichia pastoris in reading frame with alpha-factor secreting signal peptide sequence to construct the recombinant plasmid pSHL9K. The recombinant plasmid pSHL9K was transformed into Pichia pastoris GS115 with electroporation. The recombinant Pichia pastoris strains which could efficiently secret recombinant beta-Glucosidase were selected. The optimum temperature of the recombinant beta-Glucosidase was 50degreesC, and the optimum pH was 5.4. The activity of beta-Glucosidase could reach to 47U/mL in the culture medium.
  ACTA MICROBIOLOGICA SINICA 11/2005; 45(5):792-4.