Cryophilic xylosidase/arabinofuranosidase and preparation method and application thereof
A technology of arabinosidase and xylosidase, which is applied in the field of cold-adapted xylosidase/arabinosidase bifunctional cellulose degrading enzyme and its preparation, and achieves the effects of improving utilization rate, less inhibitor and better degradation
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Embodiment 1
[0046] Construction of yak rumen microbial metagenomic cosmid library and screening of xylosidase activity
[0047] The rumen samples of yaks in Qinghai, China were collected, filtered with 3 layers of gauze, and the filtrate was centrifuged to collect rumen microbial cells. For the extraction method of rumen microbial metagenome, please refer to An et al. ("Anaerobe" 2005, Volume 11, pages 207-215). For the construction method of the rumen-uncultured bacterial metagenomic library, refer to the product manual of the pWEB::TNC Cosmid Cloning Kit kit from Epicentre Company. The extracted metagenomic DNA was blunted with End-Repair Enzyme Mix, ligated with the dephosphorylated vector pWEB::TNC in the kit, and the ligated product was used MaxPlax TM After the Lambda Packaging Extracts were packaged, the host bacteria E.coli EPI100 was infected, and then spread on the LB-ampicillin plate, and cultured at 37°C for 12-16 hours to grow colonies, which were the metagenomic library of ...
Embodiment 2
[0048] Cloning and analysis of the sequence of the RuBGX1 gene of embodiment 2 rumen microorganism source
[0049] The screened cosmid-positive library clones were subcloned in pGEM11z, functionally screened, and sequenced. Specifically: the cosmid plasmid of the screened positive clone was partially digested with Sau3AI into a 2-5kb fragment, ligated into the pGEM11z vector that was digested with BamHI and dephosphorylated, and transformed into DH5α. The subclone library was screened for function, and the obtained subclone was sequenced with T7 and SP6 universal primers, and the sequence of the coding region of the β-1,4-xylosidase gene was analyzed by the analysis software DNAMAN, and the nucleotide sequence of the gene was determined such as SEQ ID NO 1 and named RuXyn1. RuXyn1 encodes 332 amino acids, its amino acid sequence is shown in SEQ ID NO.2, and its theoretical molecular weight is 42kDa. The protein domain of RuXyn1 was analyzed using SMART software (http: / / www.e...
Embodiment 3
[0051] Recombinant Expression of RuXyn1 Gene in Escherichia coli
[0052] The recombinant expression of RuXyn1 in Escherichia coli adopts the 6His fusion expression strategy, and the Escherichia coli expression vector pET-21a(+) (purchased from Novagen Company) is selected. Specifically: design and synthesize a set of oligonucleotide primers: forward primer 21axyn1FE: GGC GAATTC and reverse primer 21axyn1FX:CCG CTCGAG (The underlined parts in the sequence are the restriction endonucleases EcoRI and XhoI respectively, and the gene sequence is shown in italics), and the RuXyn1 gene is amplified by PCR, recovered by agarose electrophoresis and digested with EcoRI and XhoI respectively , connected with the vector pET-21a(+) digested with EcoRI and XhoI, the schematic diagram of the constructed RuXyn1 recombinant expression vector is as follows figure 1 shown. The ligation product was transformed into the Escherichia coli Top10 strain, and the obtained transformants were s...
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