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Cordyceps sinensis 3-isopropylmalate dehydrogenase B, as well as encoding genes and application thereof

A technology of malate dehydrogenase and Cordyceps sinensis, which is applied in the fields of application, genetic engineering, plant gene improvement, etc., can solve the problem that 3-isopropylmalate dehydrogenase B cannot be retrieved, and achieve great application prospects and expand Biological applications, high expressive effects

Active Publication Date: 2014-10-29
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, at present, the NCBI database has not yet retrieved the gene-related information of 3-isopropylmalate dehydrogenase B in Mortierella chinensis

Method used

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  • Cordyceps sinensis 3-isopropylmalate dehydrogenase B, as well as encoding genes and application thereof
  • Cordyceps sinensis 3-isopropylmalate dehydrogenase B, as well as encoding genes and application thereof
  • Cordyceps sinensis 3-isopropylmalate dehydrogenase B, as well as encoding genes and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Cultivation of "Bailing" production fungus Cordyceps sinensis

[0039] Source of the strain: Firstly, the 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 The collection center, the deposit number is CCTCC No: M2011278, which has been disclosed in the previously applied patent CN102373190A.

[0040] This bacterial classification is inoculated on the slant, and the culture medium formula (this is the liquid formula before solidification, makes the slant after being prepared according to the following ratio) is: glucose 2.0% (w / v, 1% means that 100mL culture 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 dihydroge...

Embodiment 2

[0041] Example 2: Extraction of total RNA of "Bailing" production fungus Cordyceps sinensis

[0042] Extract total RNA with TRIzol reagent, the steps are as follows:

[0043] 1) Grinding with liquid nitrogen: Put 1 g of fresh bacteria into a mortar, add liquid nitrogen repeatedly to grind until powdery, dispense into pre-cooled 1.5 mL centrifuge tubes, add 1 mL of TRIzol reagent, mix well, and stand on ice. Set aside for 5 minutes to completely separate the nucleic acid-protein complex.

[0044] 2) RNA isolation: Add 0.2 mL of chloroform, shake vigorously for 15 s, let stand on ice for 2-3 min, centrifuge at 4°C, 12000 rpm for 15 min, separate the layers, and take the upper aqueous phase, about 600 μL.

[0045] 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.

[0046] 4) RNA washing: add 1 mL of 75% (v / v) ethanol, suspend the precipitate, let stand on ice for 10 min, ...

Embodiment 3

[0048] Example 3: Sequencing of the RNA sample of "Bailing" production fungus Cordyceps sinensis

[0049] 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 provides 3-isopropylmalate dehydrogenase B for preparing 4-methyl-2-oxoglutaric acid from cordyceps sinensis Hirsutella sinensis and biologically catalyzed 3-isopropylmalate as well as encoding genes and an application thereof. The 3-isopropylmalate dehydrogenase B has an amino acid sequence shown as SEQ ID No.1, and the encoding genes are shown as SEQ ID No.1. Cloning DNA of a nucleotide sequence provided by the invention can be used for being transferred into engineering bacteria through transduction, transformation and combined transfer methods, the host 3-isopropylmalate dehydrogenase B is endowed with high expression by regulating the expression of the 3-isopropylmalate dehydrogenase B genes, an effective path is provided for widening biological application of the 3-isopropylmalate dehydrogenase B, and the 3-isopropylmalate dehydrogenase B has significant application prospects.

Description

(1) Technical field [0001] The invention relates to 3-isopropylmalate dehydrogenase B (3-isopropylmalate dehydrogenase) from "Bailing" production fungus Cordyceps sinensis, the coding gene and application thereof. (2) Background technology [0002] Cordyceps sinensis (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 Cordyceps sinensis enters the two meridians of the lung and kidney,...

Claims

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Application Information

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IPC IPC(8): C12N9/04C12N15/53C12N1/21C12P7/40C12R1/19
CPCC12N9/0006C12P7/40C12Y101/01085
Inventor 柳志强郑裕国林善薛亚平吴晖李邦良许静许峰王鸿艳
Owner ZHEJIANG UNIV OF TECH
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