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Cordyceps cytidine deaminase, coding gene and application thereof

A technology of cordyceps sinensis cell and glycoside deaminase, which is applied in the fields of application, genetic engineering, plant gene improvement, etc. It can solve the problems of rare gene and protein research, achieve great application prospects, expand production, and achieve high expression effects

Active Publication Date: 2013-04-10
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Cordyceps sinensis, as an important synthetic metabolite of pyrimidine nucleosides, still only stays in the research of metabolite composition analysis and efficacy, and the research on the related genes and proteins in the synthetic metabolic pathway of pyrimidine nucleosides of Cordyceps sinensis is still rare

Method used

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  • Cordyceps cytidine deaminase, coding gene and application thereof
  • Cordyceps cytidine deaminase, coding gene and application thereof
  • Cordyceps cytidine deaminase, coding gene and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Cultivation of "Bailing" production fungus Cordyceps sinensis

[0032] Source of the strain: Firstly, natural Cordyceps sinensis was collected from Qinghai, and brought back to Hangzhou for isolation and screening, and the L0106 strain was obtained, and the strain was identified as Hirsutella Sinensis, which was preserved in a typical culture in China Depository Center, the deposit number is CCTCC No: M 2011278, which has been disclosed in the previously applied patent CN102373190A.

[0033] Inoculate the strain on the slant, and the medium formula (this is the liquid formula before solidification, prepared according to the following proportions before making the slant) is glucose 2.0% (w / v, 1% means that 100mL medium contains 1g , the same below), corn flour 1.0%, potato juice 0.5%, dextrin 0.5%, yeast powder 0.5%, bran 1.0%, silkworm chrysalis powder 2.0%, peptone 1.0%, magnesium sulfate 0.05%, potassium dihydrogen phosphate 0.05% , agar powder 1.0%, and w...

Embodiment 2

[0034] Example 2: Extraction of total RNA of "Bailing" production fungus Cordyceps sinensis

[0035] The total RNA was extracted with TRIzol reagent, and the steps were as follows: 1) Grinding with liquid nitrogen: Take 1 g of fresh bacteria and put it into a mortar, add liquid nitrogen repeatedly to grind until powdery, and divide into pre-cooled 1.5mL centrifuge tubes, Add 1mL TRIzol reagent, mix well, and let stand on ice for 5min to completely separate the nucleic acid-protein complex. 2) RNA isolation: add 0.2mL chloroform, shake vigorously for 15s, let stand on ice for 2~3min, centrifuge at 12000rpm at 4°C for 15min, separate the layers, and take the upper aqueous phase, about 600μL. 3) RNA precipitation: add 500 μL of isopropanol, let stand on ice for 10 minutes, centrifuge at 12000 rpm at 4°C for 10 minutes, and discard the supernatant. 4) RNA washing: add 1 mL of 75% (v / v) ethanol, suspend the pellet, let stand on ice for 10 min, centrifuge at 4°C, 7500 rpm for 15 mi...

Embodiment 3

[0036] Example 3: Sequencing of the RNA sample of "Bailing" production fungus Cordyceps sinensis

[0037] After extracting the total RNA from the sample, the mRNA was enriched with Oligo(dT) magnetic beads. Add fragmentation buffer to break mRNA into short fragments (200~700bp), use mRNA as a template, use six base random primers (random hexamers) to synthesize the first cDNA strand, then synthesize the second cDNA strand, and then pass through QiaQuick PCR After the kit is purified and eluted with EB buffer, end repair is performed, polyA is added and sequencing adapters are connected, and then agarose gel electrophoresis is used for fragment size selection, and finally PCR amplification is performed. The built sequencing library is carried out with Illumina GA IIx sequencing. The original image data obtained by sequencing is converted into sequence data through base calling, that is, raw data or raw reads. The reads containing only the adapter sequence in the original sequ...

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Abstract

The invention relates to an enzyme from Bailing production bacterium Cordyceps Chinese Hirsutella for synthesizing metabolic (desoxy) uridine from (desoxy) cytidine, a gene for coding the enzyme and application thereof. The enzyme is cytidine deaminase which has more than 90% of homology with amino acid sequence disclosed as SEQ ID NO.1; and the coding gene has more than 90% of homology with nucleotide sequence disclosed as SEQ ID NO.2. The invention researches the metabolic pathway of (desoxy) cytidine synthesized (desoxy) uridine in details in principle. The cloned DNA (deoxyribonucleic acid) comprising the nucleotide sequence provided by the invention can be transformed into engineering bacterium by transduction, conversion and conjugal transfer. By adjusting the expression of the (desoxy) uridine biosynthesized gene, the host (desoxy) uridine is endowed with high expressivity, thereby providing an effective way for enhancing the yield of the (desoxy) uridine and having great application prospects.

Description

(1) Technical field [0001] The present invention relates to a cytidine deaminase (cytosine deaminase) from the "Bailing" production fungus Cordyceps sinensis which participates in (deoxy) cytidine to synthesize and metabolize (deoxy) uridine, the gene encoding the enzyme and its application. (2) Background technology [0002] Cordyceps sinensis (Berk.) Sacc. is a complex of Cordyceps sinensis parasitizing on the larvae of Lepidoptera (Lepidoptera) bat moth (Hepialus armoricanus Oberthur) larvae and larval corpses (including subunits and worm bodies ). Cordyceps sinensis is a kind of precious traditional fungal medicinal resources, which has the characteristics of diverse metabolites and biological activities, and has shown great application and development prospects in the field of biomedicine. Cordyceps sinensis has attracted much attention for its extensive and obvious medicinal effects, and is highly respected all over the world. Chinese medicine believes that Cordycep...

Claims

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Application Information

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IPC IPC(8): C12N9/78C12N15/55C12N1/21C12P19/38C12R1/19
Inventor 郑裕国柳志强吴晖李邦良许静吴玲芳许峰薛亚平袁水金王鸿艳
Owner ZHEJIANG UNIV OF TECH
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