CN105483106B - One kind ash arrhizus bacteria gene BcFch1 relevant to pathogenicity and its application - Google Patents
One kind ash arrhizus bacteria gene BcFch1 relevant to pathogenicity and its application Download PDFInfo
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- CN105483106B CN105483106B CN201610044625.7A CN201610044625A CN105483106B CN 105483106 B CN105483106 B CN 105483106B CN 201610044625 A CN201610044625 A CN 201610044625A CN 105483106 B CN105483106 B CN 105483106B
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y499/00—Other lyases (4.99)
- C12Y499/01—Other lyases (4.99.1)
- C12Y499/01001—Ferrochelatase (4.99.1.1)
Abstract
One kind ash arrhizus bacteria gene BcFch1 relevant to pathogenicity and its application microorganism belonging to genus gene engineering technology field, the pathogenic gene BcFch1 of control provided by the invention from ash arrhizus bacteria, its DNA sequence dna is made of as shown in SEQ ID No:1 1409 nucleotide；The protein of the BcFch1 coded by said gene of offer, amino acid sequence are made of as shown in SEQ ID No:2 435 amino acid；BcFch1 gene can be applied in plant botrytis resistant genetic engineering field；It lacked, be mutated or modified by controlling pathogenic PROTEIN B cFch1 to ash arrhizus bacteria, and make its pathogenicity that defect occur, can be used as target and applied in design and screening antifungal medicine.
Description
Technical field
The invention belongs to technical field of microbial genetic engineering, and in particular to epiphyte pathogenic is controlled in plant protection art
The application of gene and its coding protein.
Background technique
Ash arrhizus bacteria (Botrytis cinerea) is usually also referred to as Botrytis cinerea, belongs to Ascomycota (Ascomycota)
Fungi is the pathogen of gray mold, can infect 200 various plants, including almost all of vegetables and fruit tree.Host from seedling stage,
Period can fall ill to storage period, moreover, each position of plant can be infected by ash arrhizus bacteria, the classical symptom table of leaf portion morbidity
It is now " V " shape scab, flower portion is mainly shown as that rotten and tune withers, and fruit, which is mainly shown as, to rot and fall off.The generation of disease and
There are close relationships for the humidity of sprawling and environment, temperature, occur at 20 DEG C -23 DEG C, 90% or more relative humidity serious.Cause
This, gray mold category low temperature and high relative humidity type disease easily occurs in rainy season or Protected production, in the world every year because of the disease
Caused economic loss is up to hundred million dollars of 100-1000.It is endangered since host range is extensive, in production seriously, along with related point
Sub- investigative technique is mature, and ash arrhizus bacteria has become one of most important model plant disease fungus, studied extensively.
Ash arrhizus bacteria is typical necrotrophic disease fungus, produces a variety of virulence factors and participates in causing a disease, main to wrap
Cell wall degradation enzyme, cutinase, toxin, plant hormone, enzyme, tiny RNA and the small-molecule substance of resisting defense enzymes etc. are included,
These factors, which cooperate, enables ash arrhizus bacteria to kill host cell, and decomposes dead host tissue as nutrition.It is natural
Under the conditions of, botrytis cinerea mostly infects source as the First aggression for infecting host and again using conidium.Ash arrhizus bacteria often with mycelium,
Conidium or sclerotium are attached on plant invalid body, or overwintering in the soil and more summer, become the First aggression of next Growing season
Source.When condition is suitable for, sclerotial germination aerial mycelium and conidiophore, and generate a large amount of conidium.Mature
Conidium can be propagated by wind, rainwater, the general water of filling and farming operations etc..Under the conditions of low temperature and high relative humidity, conidium
Sprouting forms germ tube, and germ tube end expands to develop into appresorium or be further formed slightly infects the Infection structures such as pad, mainly
From floral organ, wound and the necrotic tissue intrusion to decay.
When the ash arrhizus bacteria conidium of high concentration infects host, morbidity rapidly, mainly passes through germ tube top shape at this time
At appresorium intrusion；It reduces, is reduced by the ratio that germ tube top invades, onset speed also accordingly delays with spore concentration
1-4 days, at this time mainly by by hyphal development at appresorium or infect pad intrusion.It, will after ash arrhizus bacteria invades host cell
The challenge of hostile environment in host tissue can be directly faced, pathogen must adjust rapidly, on the one hand inhibit the anti-of plant
Imperial reaction, on the other hand wants physics, chemical environment in active adaption host cell, accomplishes these two aspects, ash arrhizus bacteria is just expected to
Successfully parasitic plant.Largely, ash arrhizus bacteria is the metabolic pathway by changing itself, and secrete correlation effect because
Sub (such as toxin) participates in gene, albumen and the metabolite of respective process and its molecule of regulation come realizing above-mentioned target
Mechanism is still known little.The field is furtherd investigate, identifies key factor of the ash arrhizus bacteria to adapt to environment in host,
It not only facilitates and discloses the pathogenic molecular mechanism of this necrotrophic disease fungus of ash arrhizus bacteria, it is also possible to which therefrom discovery can
Using the protein as fungicide action target, the efficient medicament for exploitation prevention and treatment gray mold and other similar diseases establishes reason
By and technical foundation.
Fch1 is a kind of ferrochelatase, and (the 8th step) is reacted in the final step for participating in catalysis ferroheme route of synthesis.It should
Albumen is widely present in the biologies such as animal, plant, bacterium, fungi, since the prothetic group that ferroheme can be used as numerous albumen participates in
A variety of life processes, therefore, the Fch1 protein as one of catalysis haeme synthetase class have the function of important.Fch1 egg
White matter equally exists in ash arrhizus bacteria, and function is not yet identified, passes through analysis ash arrhizus bacteria Fch1 encoding gene
Pathogenic function evaluates the gene in ash arrhizus bacteria development and the effect of pathogenic course, is conducive to identify potential prevention and treatment target, use
In the novel antifungal medicament of screening.
Summary of the invention
The purpose of the present invention is intended to provide a kind of protein for controlling pathogenic gene and its coding.
Control pathogenic gene provided by the present invention derives from ash arrhizus bacteria, and entitled BcFch1, DNA sequence dna is such as
Shown in SEQ ID No:1.The DNA sequence dna is BcFch1 gene open reading frame, is made of 1409 nucleotide, wherein including 3
A exon is located between 5 ' the 1st to 267 nucleotide in end of SEQ ID No:1, the 321st to 903 nucleotide
Between between the 952nd to 1409 nucleotide, the coding section length of composition adds up to 1308 nucleotide.
The present invention provides the protein of BcFch1 coded by said gene, amino acid sequence, should as shown in SEQ ID No:2
Sequence is made of 435 amino acid.
Control pathogenic gene BcFch1 from ash arrhizus bacteria can be applied to plant botrytis resistant genetic engineering field.
The encoded protein of control pathogenic gene BcFch1 from ash arrhizus bacteria is lacked, is mutated or repaired
Decorations, and make its pathogenicity that defect occur, it can be used as target and applied in design and screening antifungal medicine.
Present invention demonstrates that the missing or mutation of BcFch1 gene, cause ash arrhizus bacteria pathogenicity to significantly reduce, explanation
BcFch1 gene is that ash arrhizus bacteria causes gene necessary to crops gray mold.Therefore, screening can prevent the gene expression
The compound of expression, modification and positioning with its protein can effectively control the generation of gray mold, so that it is new to facilitate exploitation
One important use of type fungicide, i.e., BcFch1 gene provided by the present invention is: the egg that the expression of the gene is encoded with it
Expression, modification and the positioning of white matter product can be used as important candidate targets site, be used for antifungal medicine (especially anti-ash
Mildew bacterium medicament) design and screening.
Detailed description of the invention
Fig. 1 is the structure domain analysis schematic diagram of BcFch1 protein
Wherein: Ferrochelatase is ferrochelatase structural domain；
Fig. 2 is knockout strategy (carrying out gene replacement by homologous recombination) schematic diagram of ash arrhizus bacteria BcFch1 gene
Wherein: WT is wild-type strain B05.10, and pFch1-ko is knockout carrier, and BcFch1-KO lacks for BcFch1 gene
Mutant is lost, a, b, c, d are the primer for verifying mutant and complementing strain；
Fig. 3 is the PCR verifying electrophoretogram of BcFch1 deletion mutant body and genetic complement bacterial strain
Wherein: a, b, c, d are the primer, and Fig. 2 is seen in corresponding position；M1 is BcFch1 deletion mutant body；M1/Fch1
For the complementing strain for being transferred to complete BcFch1 gene on the basis of mutant M1；
Fig. 4 be BcFch1 gene mutant compared with the pathogenicity of wild-type strain photo
Wherein: selected host is tomato, and using the method for Isolated leaf inoculation bacteria cake, inoculation is evaluated after 3 days；
M1, M2 are two plants of BcFch1 deletion mutant bodies independently obtained；
Fig. 5 is that the quantitative analysis that the mutant of BcFch1 gene infects Lesion size produced by host with control strain is illustrated
Figure
Wherein: inoculation method is same as above, and inoculation measured calculating to leaf spot lesion area after 3 days, is converted into relatively large
It is small.* is indicated in the horizontal upper significant difference of p < 0.01.
Specific embodiment
It in order to better describe the present invention, is further described below by specific embodiment, following embodiments
In method be unless otherwise instructed conventional method.
The correlation analysis of embodiment 1BcFch1 gene
The open reading frame of ash arrhizus bacteria BcFch1 gene is made of 1409 nucleotide, includes 3 exons, code area
CDNA overall length is 1308 nucleotide, and the protein product of coding is made of 435 amino acid.Take BcFch1 protein sequence into
Row compares analysis (http://blast.ncbi.nlm.nih.gov/Blast.cgi), and discovery Fch1 is widely present in animal, plants
In the cell biologicals such as object, fungi and bacterium.Structure domain analysis discovery, BcFch1 protein include a conservative ferrochelatase
Structural domain (see Fig. 1).
The knockout of embodiment 2BcFch1 gene
1) building of knockout carrier
Using primers F ch1-UP-F (5'-CTCGAGAAGAGCGGCAAGCGTGGGA-3') and Fch1-UP-R (5'-
GGTACCGGTACTCGAAAGGCAGACAGA-3'), using the genomic DNA of ash arrhizus bacteria bacterial strain B05.10 as template amplification
BcFch1 upstream region of gene 794bp segment, using Fch1-DN-F (5'-GGATCCGATGTCCTGGATGCAAGAGTGA-3') with
Fch1-DN-R (5'-CTGCAGGTGGGTTGGTGTACGATATTCG-3') expands ash arrhizus bacteria BcFch1 downstream of gene 767bp
Segment, reaction system are as follows: 10mmol/L dNTP Mixture, 0.5 μ L；10 × PCRbuffer, 2.5 μ L；Upstream and downstream primer each 1
μL(10μmol/mL)；Template DNA, 1 μ L；Ex-Taq, 0.2 μ L (5U)；ddH2O, 18.8 μ L；Amplification program are as follows: 94 DEG C of initial denaturations
It 3 minutes, then (1) 94 DEG C, is denaturalized 50 seconds；It (2) 58 DEG C, anneals 50 seconds；(3) 72 DEG C, extend 60 seconds；(4) it recycles 30 times；(5)
72 DEG C extend 10 minutes.By above-mentioned two segment DNAs amplified production be successively cloned between Xho I of pXEH carrier, Kpn I site with
Between BamH I, Pst I site, it is built into knockout carrier pFch1-ko (see Fig. 2), and carry out sequence verification.
2) conversion of ash arrhizus bacteria
A. the culture of Agrobacterium
Picking contains the Agrobacterium tumefaciens strain Agl-1 single colonie of binary vector pFch1-ko, is seeded to containing 50 μ g/ml cards
MM fluid nutrient medium (dipotassium hydrogen phosphate 0.205%, potassium dihydrogen phosphate 0.145%, sodium chloride of that mycin, 10 μ g/ml rifampins
0.015%, epsom salt 0.05%, calcium chloride hexahydrate 0.01%, ferrous sulfate heptahydrate 0.00025%, ammonium sulfate 0.05%,
Glucose 0.2%) in, 250rpm, 28 DEG C of shaken cultivation 48h；4000rpm is centrifuged 5 minutes, abandons supernatant, IM fluid nutrient medium
(dipotassium hydrogen phosphate 0.205%, potassium dihydrogen phosphate 0.145%, sodium chloride 0.015%, epsom salt 0.05%, six water chlorinations
Calcium 0.01%, ferrous sulfate heptahydrate 0.00025%, ammonium sulfate 0.05%, glucose 0.2%, 200 μM of AS, MES 0.854%,
Glycerol 0.5%) it is resuspended, 4000rpm is centrifuged 5 minutes, abandons supernatant；IM culture medium is resuspended, and 28 DEG C, 250rpm shaken cultivation 6h, into
Row pre-induced.
B. the production spore culture of ash arrhizus bacteria
B05.10 bacterial strain is selected, a small amount of spore is taken to be coated on PDA culture medium (the well-done filtering of potato 20%, glucose
2%, agar 1.5%), set 28 DEG C of culture 8h and enable spore fast-germination, be then transferred to 20 DEG C and cultivate 3-5 days, to phage surface
After the covering of grey spore, with IM fluid nutrient medium scraping, spore is collected, micro- sem observation is adjusted using haemocytometer
Spore concentration is 1 × 106/mL。
C. Agrobacterium tumefaciems and the co-cultivation of ash arrhizus bacteria conidium and transformant screening
The Agrobacterium bacterium solution for inducing 6h in advance in IM fluid nutrient medium and ash arrhizus bacteria spore liquid are mixed in equal volume, added
Enter AS, final concentration is made to reach 500 μM, mix, then press 250~350 μ L/ wares, is uniformly applied to the IM culture for being covered with glassine paper
On base, 22 DEG C of dark culturing 48h；After co-cultivation, glassine paper is transferred to the PDA culture medium containing 100 μ g/mL hygromycin
On, continue to cultivate under the same terms.On the bacterium colony that picking extends after 4~7 days to the screening and culturing medium containing same antibiotic.
3) verifying of deletion mutant
Two pairs of primers are selected to screen by PCR amplification to transformant.Amplification meets following result, is determined as
BcFch1 deletion mutant body: the primer a (5'-TTGTTCGCTTCCTCTTCGTC- except the homology arm of upstream on genome
It can 3') be expanded with the primer b (5'-ACAGACGTCGCGGTGAGTTCA-3') of hygromycin gene pairing to expected size
The recombinant fragment of (1.5kb)；And code area primer c (5'-GGGGATTTCTTGAGTAGATTATTTG-3') and d (5'-
CATCACGGCGTAGACTGTAGC-3') without amplified band (wild-type strain is amplifiable to arrive 0.8kb segment).As a result, from conversion
2 plants of BcFch1 deletion mutant bodies: M1 and M2 bacterial strain are screened in son, for follow-up function analysis (see Fig. 3).
The genetic complement of embodiment 3BcFch1 deletion mutant body
Using primer C-F (5'-GAATTCTTGTTCGCTTCCTCTTCGTC-3') and C-R (5'-
CTGCAGGTGGGTTGGTGTACGATATTCG-3'), expand ash arrhizus bacteria BcFch1 full length gene 3116bp (comprising promoter,
Open reading frame and terminator), it is first cloned on pMD18-t carrier, is then subcloned again to pSULF carrier (containing the phonetic sulphur of chlorine
Grand resistant gene) EcoRI and Pst I site between, be built into genetic complement carrier pFch1-ko-c.Carrier is tested through sequencing
Card, confirms no amino acid mutation.Using foregoing Agrobacterium-medialed transformation method, 100 μ g/mL chlorimuronethyls are used
It is screened, which is transferred in BcFch1 deletion mutant body M1 genome, obtain genetic complement bacterial strain M1/
Fch1.It selects the primer a once used when mutant verifying and b, c and d to carry out PCR amplification, as a result meets expected (see Fig. 3): with
Mutant M1 is identical, and original BcFch1 gene is replaced by hygromycin gene HPH (primer a in complementing strain M1/Fch1
It is the positive with b amplification), but additionally possess subsequent BcFch1 gene (code area primer c and the d amplification being transferred to
It is similarly positive).
Effect of the embodiment 4BcFch1 gene at the pathogenic aspect of ash arrhizus bacteria
Using Isolated leaf inoculation method, the pathogenicity situation of change of BcFch1 mutant is evaluated.From the tomato of hot-house culture
Mature leaf is acquired on plant, is horizontally arranged in container, is beaten using punch and take strain to be tested bacteria cake, face down left-hand thread to leaf
On piece, 20 DEG C of moisturizing dark culturings evaluate the pathogenicity of strain to be tested after 3 days.Experimental result shows that BcFch1 mutant is basic
Pathogenecity is lost, small scab can only be found near vaccination, and do not extend.Form distinct contrast with this, it is wild
Raw type can successfully infect tomato leaf, and spread to more than half blade face rapidly (see Fig. 4).The cause of genetic complement bacterial strain M1/Fch1
Sick power is normal, can be restored to wild-type levels.Calculating is measured to leaf spot lesion area, discovery BcFch1 mutant, which infects, to be drawn
20% (see Fig. 5) caused by the lesion area deficiency wild type risen.Above-mentioned incidence of leaf surface is carried out disinfection, is coated with after grinding
To PDA plate, ash arrhizus bacteria bacterium colony number is counted after culture 2 days.The study found that the blade that BcFch1 mutant infects is connecing
Almost without thallus living after planting three days, and more or less a hundred bacterium colony can be obtained after the blade grinding that wild type infects.The research knot
Fruit shows that BcFch1 is a crucial Disease-causing gene, is necessary to ash arrhizus bacteria infects host, if the gene or its volume
The protein loss of activity of code, ash arrhizus bacteria will lose the ability for infecting host and causing disease.
Sequence table
The sequence of SEQ ID No:2
(i) sequence signature: (A) length: 435 amino acid；(B) type: amino acid；(C) chain: single-stranded.
(ii) molecule type: polypeptide
(iii) sequence description: SEQ ID No:2
Claims (1)
1.BcFch1Application of the gene in reduction ash arrhizus bacteria is pathogenic, which is characterized in that especially by knockoutBcFch1Base
It is described because pathogenic to reduceBcFch1The DNA sequence dna of gene is as shown in SEQ ID No:1.
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| CN102965382A (en) * | 2012-12-07 | 2013-03-13 | 河北农业大学 | New botrytis cinerea gene related to pathogenicity and application of new botrytis cinerea gene |
| CN105154453A (en) * | 2015-10-19 | 2015-12-16 | 吉林大学 | Pathogenicity related botrytis cinerea gene BcSep4 and application thereof |
| CN105154454A (en) * | 2015-10-19 | 2015-12-16 | 吉林大学 | Pathogenicity-related Botrytis cinerea gene BcArs2 and application thereof |
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|---|---|---|---|---|
| CN102965382A (en) * | 2012-12-07 | 2013-03-13 | 河北农业大学 | New botrytis cinerea gene related to pathogenicity and application of new botrytis cinerea gene |
| CN105154453A (en) * | 2015-10-19 | 2015-12-16 | 吉林大学 | Pathogenicity related botrytis cinerea gene BcSep4 and application thereof |
| CN105154454A (en) * | 2015-10-19 | 2015-12-16 | 吉林大学 | Pathogenicity-related Botrytis cinerea gene BcArs2 and application thereof |
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