Construction and application of multiple gene coexpression system containing angolosamine glycosylsynthetase and glycosyltransferase
A technology of glycosyltransferase and glycosylaminoglycosyl, applied in the field of multi-gene co-expression system, can solve the problems of complex chemical synthesis of deoxyglycosylation and low yield
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Embodiment 1
[0046] Identify several (5-8) transformants CH999 / pAYT55 containing pAYT55, culture them on a solid medium at 30°C for 5 days until sporulation, collect the spores, and store them in glycerol tubes (spore titer greater than 10 61 / μL), get 10 microliters of spore suspension and inoculate 2mL seed culture medium (the formula of the culture medium sees the content of the invention), place it in a constant temperature shaker at 30°C, 200 rpm, and cultivate it for 2 days, then press 1:50 Ratio, get the seed culture and transfer it into the production medium ((see the content of the invention for the formula of the medium), and inoculate the seed culture of the bacterial strain B135 that produces polyketides in equal amounts at the same time, 30 ° C, 200 rpm, shaker Cultivate for 5 days. Transfer the fermented liquid into a centrifuge tube, centrifuge at 5000 rpm at room temperature for 10 minutes, collect the supernatant, and directly carry out LC / MS detection. The detection conditi...
Embodiment 2
[0049] Identify several (5-8) transformants B135 / pAYT55 containing pAYT55, culture them on solid medium for 5 days until spore production, collect spores, and store them in glycerol tubes (spore titer greater than 10 6 individual / μL), get 500 microliters of spore suspension and inoculate 20mL seed culture medium (the formula of culture medium sees the content of the invention), place it in a constant temperature shaker at 30°C, 200 rpm, and cultivate it for 2 days, then press 1:25 Ratio, take the seed culture and transfer it into the production medium (see the content of the invention for the medium formula), transfer the fermentation broth into a centrifuge tube, centrifuge at 5000 rpm at room temperature for 10 minutes, and collect the supernatant. Adjust the pH of the supernatant to neutral with 1N HCl or 1N NaOH, extract three times with ethyl acetate, mix the extracts, add water to extract once (wash), filter with anhydrous sodium sulfate powder to remove water, filter wit...
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