DNA fragment with promoter function and application
A promoter and functional technology, applied in the field of DNA fragments, to achieve the effect of strong specific expression activity
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Embodiment 1
[0034] culture of bacteria
[0035] Take out the glycerol tube of Bacillus amyloliquefaciens (-80°C) and streak it on the LB solid plate at 37°C for 20-24h, pick a single colony in 10mL LB medium with 1% final concentration of glucose, and culture at 37°C, 200rpm until OD 6008.5-10 (U2000 full-wavelength spectrophotometer, Hitachi, Japan).
Embodiment 2
[0037] Bacterial total RNA extraction, transcriptome library construction and sequencing
[0038] Collect 1mL cells in Example 1 and centrifuge quickly at 10000g for 1min to extract bacterial total RNA, such as figure 1 . For the specific extraction method, please refer to the Cell Bacterial Total RNA Extraction Kit of Tiangen Biochemical Technology Co., Ltd. The samples used for RNA-Seq sequencing library preparation were tested by Agilent Technologies 2100 Bioanalyzer, and the mixed DNA molecules were treated with DNaseI (RNase Free), and the vast majority of total RNA was removed with Ribo-Zero (Gram-Positive Bacteria) kit (USA) rRNA, purified mRNA. The mRNA was first broken into fragments of appropriate size, using the fragmented mRNA as a template, reverse transcriptase and random primers were added to synthesize double-stranded cDNA, and then the synthesized cDNA was purified with the kit QIAquick PCR Purification Kit (Qiagen). Fill in the cohesive ends of the cDNA, a...
Embodiment 3
[0040] Screen and clone promoter fragments
[0041] The RNA-Seq sequencing data was used to analyze the transcript structure of Bacillus amyloliquefaciens and the whole genome to analyze the gene containing the transcription start position. Through RPKM quantification, a highly expressed gene was screened. Its sequence is shown in SEQ ID NO 1. Using the genomic DNA of the Bacillus amyloliquefaciens XH7 strain as a template, amplify a 300bp DNA fragment, namely the Pscut01 promoter fragment, with artificially synthesized primers SEQ ID NO 3 and SEQ ID NO 4, such as figure 2 , consistent with the size of the target product. Introduce the restriction site EcoRI, KpnI.
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