CN102851290A - ODC gene promoter for nicotine biosynthesis and application thereof - Google Patents

Abstract

The invention relates to an ODC gene promoter for nicotine biosynthesis and an application thereof. The ODC gene promoter for nicotine biosynthesis is extracted from an N. sylvestris genome sequence, and has a nucleotide sequence as shown in SEQ ID NO.1. The promoter region of the nicotine ODC gene can generate transcription with a basic level, and the regulation region can response to various ambient conditions and thus regulate the expression level of the nicotine synthesis genes correspondingly (up-regulation of down-regulation as required), which has important practical significance on the production of nicotine extraction raw materials with high quality.

Description

Nicotine biosynthesizing ODC gene promoter and application thereof

Technical field

The present invention relates to technical field of biological genetic engineering, be specifically related to a kind of nicotine biosynthesizing ODC gene promoter and application thereof.

Background technology

Nicotine (Nicotin) claims again Nicotine, and chemical name is 1-methyl-2-(2-pyridyl) tetramethyleneimine, and molecular formula is C ₁₀H ₄N ₂, be a kind of natural alkaloid that is present in the tobacco, be distinctive in the tobacco.Nicotine can produce certain physiological stimulation effect to the people, is to make tobacco have the principal element of commodity value.Along with the biological activity of nicotine more and more is subject to people's attention, its application is also more and more extensive, and their exploitation has been deep into food, health care, medicine and daily with a plurality of fields such as chemical industry gradually, and application prospect is boundless.The nicotine a large amount of such as the substitute of tobacco need of production: the methods for the treatment of that at present tobacco is relied on comprises pharmacological agent, psychotherapeutics, acupuncture and treatment by Chinese herbs etc., treatment plan and medicine through drugs approved by FDA mainly contain: nicotine alternative medicine such as nicotine patch, chewing-gum, nasal spray and inhalation etc., adopt the treatment of nAChR inhibitor medicaments, such as Bupropion and injection such as tartrate varenicline, also have Mei Kala, nortriptyline, clonidine and anxiolytic etc., a large amount of extraction nicotines of the need of production of these nicotine surrogates are as raw material; In addition, nicotine also is widely used in the exploitation of environment-protection pesticide and the production of extraordinary illness medicine: nicotine series pesticide platymiscium sterilant, because of its have steam smoke, stomach toxicity, the function of tagging and rapidly the characteristics such as degraded noresidue be widely used in the sterilants of the farm crop such as grain, oil plant, vegetables, fruit, herbage, desirable efficient pesticides and the biological agricultural chemicals of producing green food, it also is widely used on the medicine industry, is the extraordinary raw material of the illness medicines such as the development treatment is cardiovascular, tetter, snake venom.Also available its prepared citric acid nicotine is applied to the breed improvement agent component of high-grade cigarette etc., and developing rapidly along with tobacco industry, fine chemistry industry, pharmacy, organic synthesis, national defence, agricultural chemicals etc.Grow with each passing day to the demand of nicotine in market, particularly the demand of high-purity nicotine is larger.

The nicotine molecule comprises a pyrrolidine ring and pyridine ring, and pyridine ring is synthetic by the NAD approach, and pyrrolidine ring is formed through the intermediate product putrescine by primary amino acid.Participate in the biosynthetic albumen of nicotine and comprise ornithine decarboxylase (ornithine decarboxylase, ODC), quinolinic acid synthetic enzyme (quinolinate synthase, QS), aspartate oxidase (aspartate oxidase, AO), QPRT (quinolinate phospho-ribosyltransferase, QPT), putrescine N-methyltransferase (putrescine N-methytransferase, PMT) (Katoh et al., 2005; Cane et al., 2005), diamine oxidase (diamine oxidase, DAO), the gene of these albumen of encoding can N. sylvestrisIn find.Wherein putrescine N-methyltransferase is by three genes encodings (PMT1, PMT2, PMT3) (Shoji et al., 2000).If regulate and control the synthetic of nicotine by the gene of encoding such enzymes class, then at first should find its corresponding promotor.

Summary of the invention

The technical problem to be solved in the present invention provides a kind of ODC gene promoter and mosaic gene thereof that can play to the nicotine biosynthesizing regulating and controlling effect.

For solving the problems of the technologies described above, the technical solution used in the present invention is:

A kind of nicotine biosynthesizing ODC gene promoter, its nucleotides sequence is classified as:

(1) nucleotide sequence shown in the SEQ ID NO.1; Or

(2) nucleotide sequence shown in the SEQ ID NO.1 is through routine techniques means transformations such as repetition, disappearance, replacement or displacements and the nucleotide sequence with same function that forms.

The increase primer pair of above-mentioned ODC gene promoter has the nucleotide sequence shown in SEQ ID NO.2 and the SEQ ID NO.3.

A kind of mosaic gene wherein comprises above-mentioned nicotine biosynthesizing ODC gene promoter and sequence that be operatively connected with it, the coding goal gene.

A kind of plant conversion carrier wherein comprises the above mosaic gene.

A kind of transgenic plant cells wherein comprises above-mentioned mosaic gene.

A kind of transgenic plant tissue wherein comprises above-mentioned mosaic gene.

The application in the biosynthesizing of regulation and control nicotine of above-mentioned nicotine biosynthesizing ODC gene promoter or above-mentioned mosaic gene.

The present invention has actively useful effect:

1. find and extracted nicotine biosynthesizing ODC gene promoter;

2. nicotine ODC gene promoter region produces transcribing of basal level, the regulation and control zone can be made different envrionment conditionss and being replied, the expression level of nicotine synthetic gene is made corresponding adjusting (raise as required or reduce), and then tobacco planting is produced the tobacco leaf of an amount of nicotine content and produced high-quality nicotine and extract raw material important realistic meaning is arranged.

Description of drawings

Fig. 1 is pcr amplification nicotine gene promoter electrophorogram, and its left figure is take the N.tabacum genomic dna as template, and right figure is take the N.sylvestris genomic dna as template;

Fig. 2 is ODC, QPT, AO, the conservative binding site frame diagram of transcribing that contains in the gene promoters such as QS; By the single frame diagram of transcribing the binding site structure of the FrameWorker software analysis that uses Genomatix company; Transcribe binding site tissue (specificity that comprises the DNA chain, relatively order) all guard; The variable in distance of different genes promotor transcription binding site is very little; Different colours represents the binding site of different transcription factors; Meeting representative above the single line is transcribed binding site and is positioned at sense strand, and the meeting representative below the single line is transcribed binding site and is positioned at antisense strand;

Fig. 3 is ODC, QPT, AO, the transcription factor of finding in the gene promoters such as QS signal mode chart; This mode chart is obtained by the Fast software analysis of Genomatix company; Change distance in the mode chart and reacted distance between the transcription factor binding site point different in three gene promoter sequences.

Embodiment

Further set forth the present invention below in conjunction with specific embodiment.Related test method or analytical procedure among the following embodiment if no special instructions, is ordinary method, and agents useful for same is commercially available if no special instructions.

Separation, the evaluation of embodiment 1 nicotine synthetic gene

Nicotine synthetic gene ODC, DAO, AO, QS, QPT, PMT1, PMT2 and PMT3 promoter sequence all from N. sylvestrisExtraction obtains in the genome sequence, and the position of these genes in genome is as shown in table 1 below.Nicotine synthetic gene ODC promoter sequence shown in SEQ ID NO.1 wherein.

Each promotor of table 1 exists N. sylvestrisPosition in the genome

According to N. sylvestrisThe nicotine synthetic gene ODC that extracts in the genome, QS, AO, QPT, DAO, PMT1, the promoter sequence of PMT2 and PMT3, the design primer (as shown in table 2) from N. tabacumThe promoter sequence that increases in the genome is cloned in the pET-43.1a carrier of modified, checks order, and wherein〉sequence of NT-ODC is shown in SEQ ID NO.4.Above-mentioned sequence with N. sylvestrisThe promoter sequence comparison that tobacco increases out is very conservative, and the controlling element above the promotor is consistent, thereby proves that regulatory mechanism is identical between them.

Table 2 pcr amplification N. tabacumK326 and N.sylvestrisODC in the tobacco gene group, AO, QS, QPT, PMT1, PMT2 and the used primer of PMT3 promotor

ODC-F	TACTTCCAATCCATGagtgaaattacaagtacaag
		ODC-R	TATCCACCTTTACTGtcaAAGGAAGAAAAGAGAGAGGTAA
QPT-F	TACTTCCAATCCATGactcctagttgttgttata
		QPT-R	TATCCACCTTTACTGtcaTTATAAGTGAGAGTTAA
QS-F1	TACTTCCAATCCATGttctacaaaaggtccatttc
		QS-R1	TATCCACCTTTACTGtcaTTTTTCGGGTGAGGACGAAA
AO-F	TACTTCCAATCCATGaagttactgtgttctagatt
		AO-R	TATCCACCTTTACTGtcaATTACCTTAAAGTAGCAA
PMT1-F	TACTTCCAATCCATGattttttattaaatactatc
		PMT1-R	TATCCACCTTTACTGtcaGATATGACTTCCATTTTC
PMT2-F	TACTTCCAATCCATGctcatacggattttagacag
		PMT2-R	TATCCACCTTTACTGtcaGTAGAGCCATTTGTGTT
PMT3-F	TACTTCCAATCCATGaaatactatctggtgacaag
		PMT3-R	TATCCACCTTTACTGtcaAATGGCACCATTCTTGAA

The PCR reaction system: the PCR reaction solution comprises 10 pmol primers, 50 ng genomic dnas, 0.2 mM dNTP, 10% DMSO and Hot Start archaeal dna polymerase KOD (Novagen), the PCR reaction conditions is 95oC, denaturation 5 min, 95oC, sex change 1 min, 50oC 1 min that anneals, 68oC extends 1min, 35 circulations, and last 68oC extends 10 min again.Adopt QIAquick PCR purification kit (Qiagen), test kit purifying PCR product, PCR product cloning after using In-Fusion HD EcoDry Cloning Kit (Clontech) test kit with purifying is to the pET-43.1a (pLEICS-01) of modified, then sequencing analysis.

The function of embodiment 2 nicotine synthetic genes

Analyzed and participated in eight synthetic mechanisms of gene regulations of nicotine: the nicotine molecule comprises a pyrrolidine ring and pyridine ring, and pyridine ring is synthetic by the NAD approach, and pyrrolidine ring is formed through the intermediate product putrescine by primary amino acid.Pyridine ring is by AO, QS, and QPT etc. catalyze and synthesize.Wherein, aspartate oxidase (aspartate oxidase, AO) catalyzing glycerol and aspartic acid form pyridine-2,3-dicarboxylic acid.Quinolinic acid synthetic enzyme (quinolinate synthase, QS) catalysis pyridine-2,3-dicarboxylic acid forms quinolinic acid.QPRT (quinolinate phospho-ribosyltransferase, QPT) catalysis quinolinic acid produces nicotinic acid by the pyridine nucleotide circulation.The biosynthetic main route of N-crassitude ring then is successively by ornithine decarboxylase (ornithine decarboxylase in the nicotine, ODC) the catalysis ornithine forms putrescine, afterwards by putrescine N-methyltransferase (putrescine N-methytransferase, PMT) catalysis generates N-methyl putrescine, then generate N-methyl-pyrrolidinium by diamine oxidase (diamine oxidase, DAO) catalysis.Final synthetic of nicotine is that the nicotinic acid decarboxylation is combined with pyrrole ring and is finished.Wherein, QPT is the main regulatory enzyme of the nicotinic acid of the required usefulness of pyridine moiety in the nicotine biosynthetic process, is the biosynthetic important control point of nicotine.And PMT is the enzyme of restriction maximum in the pyrrolidine ring route of synthesis.PMT and QPT are the maximum speed limit enzymes in 2 intermediate biosynthesizing of nicotine, and other enzymes in this approach have regulating effect in some cases.The expression amount of these enzymes then by its promoter regulation element by being regulated and control in conjunction with different transcription factors.

N. tabacumIn two transcribe binding site (TFBS) G-box and GGC-motif has mediated PMT1a replying for methyl jasmonate.G-box and GGC-motif lay respectively at upstream 95bp and the 55bp (Xu and Timko, 2004) in tss site.Use the information in these two sites and their distance and relative direction to define a FastM model (Klingenhoff et al., 1999) and explain this regulative mode (Fig. 3).

The contriver has extracted the promoter sequence of nicotine synthetic gene, and has compared the occurrence type of TFBS with the FastM model analysis.PMT1, PMT2, and the promoter sequence of PMT3 meets this model.The distance of two elements and relative direction and N. tabacumIn conservative property consistent. N. sylvestrisIn the imaginary transcription initiation site of GCC-motif distance between 54-60bp, also be can with N. tabacumIn the middle comparison.Other nicotinyl does not contain the TFBS motif because of the promoter sequence of synthetic gene.

The jasmonic responsing reaction is by MYC2 transcription factor mediation (Chini et al., 2007).Therefore use FrameWorker to analyze the contained MYC2 binding site (D hr et al. 2005, Cohen et al., 2006) of TFBS of 8 promoter sequences.For AO, the promoter sequence of QS and QPT can identify 6 different TFBS, shows that these genes comprise a common regulative mode (Fig. 2).Except the tissue (comprising distance, relative direction) of TFBS is outside the high conservative, the similarity of every pair of promotor＜50%.Therefore we to detect framework be not because the high conservative of nucleotide sequence, but conservative on the transcription factor level.

Conservative motif is forgiven the MYCL of transcripton family, DOFF, GTBX, L1BX, OCSE, and the binding site of GBOX.Except MYCL and GBOX, the transcription factor of OCSE family also participates in signal (Whitfield's ointment) conductive process of defense response and plant hormone (Chen et al., 1996).Interaction between the transcription factor was also found in other gene in the past, such as GBOX-DOFF (Norre et al., 2002), OCSE-DOFF (Chen et al., 1996), GTBX-MYCL (Simpson et al., 2003).

The expression of embodiment 3 nicotine synthesis related genes

Nicotine is synthetic at the root of tobacco, then is transported to blade and other over-ground part (Cane et al., Shoji et al.).Gene expression results shows that the synthetic gene of all nicotine all is present in N. sylvestrisRoot, and do not express at stem, leaf or in spending or low express (table 3).

The expression of table 3 nicotine synthetic gene

Gene	root	leaf	flower	stem
					QPT	1.18142	0.34834	0.28289	0.24329
QS	1.08342	0.21988	0.11682	0.11265
					AO	0.00200	0.00000	0.00000	0.00000
ODC	0.09851	0.01137	0.03978	0.02068
					PMT1	1.12893	0.00007	0.00366	0.00064
PMT2	0.00102	0.00000	0.00000	0.00000
					PMT3	0.06579	0.00000	0.00092	0.00000
DAO	0.28119	0.00000	0.01128	0.00092

Although, above the present invention is described in detail with a general description of the specific embodiments, but on basis of the present invention, can make some modifications or improvements to it (such as modification that gene order of the present invention is carried out etc.), this will be apparent to those skilled in the art.Therefore, these modifications or improvements all belong to the scope of protection of present invention without departing from theon the basis of the spirit of the present invention.

Sequence table

SEQUENCE LISTING

＜110〉Agricultural University Of He'nan

＜120〉nicotine biosynthesizing ODC gene promoter and application thereof

<130> /

<160> 4

<170> PatentIn version 3.2

<210> 1

<211> 601

<212> DNA

<213> N.sylvestris

<400> 1

agtgaaatta caagtacaag attacaactt taattatgta atttacaaat ataatacata 60

tcctatttaa actaaactaa gcaatttaat tttaaaagtc acaagttaaa ataaaaacac 120

acattaatta atatgattaa tgatagacat ttatttttaa aaatactccg gtgcaaacac 180

aatatacgag taattatatg tggattgact tccactgatt ttttcttgat cctctaatat 240

gtcgtagaaa aaatcatgca ccgttggata atatagattt aattatcatt tacccaacaa 300

aaagtacatc acttcatcag atttacataa atgacttatt gtaattaaat tcaataccgt 360

tgaccaccta ccccttcaac agctatttct ctaaaaaaaa aaaaaaagaa gaaaatacta 420

cgtagattac acaatattat cagtagtagt atcacttttc gtccctctat ataatgataa 480

acattttttg aggtttcccc gtctcaaagg gaacaagaga aacattcata ttattgaatc 540

cctagtttct tttctttccc tttgattcct tcctctcatt tacctctctc ttttcttcct 600

t 601

<210> 2

<211> 35

<212> DNA

＜213〉synthetic

<400> 2

tacttccaat ccatgagtga aattacaagt acaag 35

<210> 3

<211> 40

<212> DNA

＜213〉synthetic

<400> 3

tatccacctt tactgtcaaa ggaagaaaag agagaggtaa 40

<210> 4

<211> 597

<212> DNA

<213> N.tabacum

<400> 4

agtgaaatta caagtacaag attacaactt taattatgta atttacaaat ataatacata 60

tcctatttaa actaaactaa gcaatttaat tttaaaagtc acaagttaaa ataaaaacac 120

acattaatta atatgattaa tgatagacat ttatttttaa aaatactccg gtgcaaacac 180

aatatacgag taattatatg tggattgact tccactgatt ttttcttgat cctctaatat 240

gtcgtagaaa aaatcatgca ccgttggata atatagattt aattatcatt tacccaacaa 300

aaagtacatc acttcatcag atttacataa atgacttatt gtaattaaat tcaataccat 360

tgaccaccta ccccttcaac agctatttct ctaaaaaaaa aaagaagaaa atactacgta 420

gattacacaa tattatcagt agtagtatca cttttcgtcc ctctatataa tgataaacat 480

tttttgaggt ttccccgtct caaagggaac aagagaaaca ttcatattat tgaatcccta 540

gtttcttttc tttccctttg attccttcct ctcatttacc tctctctttt cttcctt 597

Claims (7)

1. nicotine biosynthesizing ODC gene promoter, its nucleotides sequence is classified as:

(1) nucleotide sequence shown in the SEQ ID NO.1; Or

(2) nucleotide sequence shown in the SEQ ID NO.1 is modified the nucleotide sequence with same function that forms through repeating, lack, replace or being shifted to transform.

2. the primer pair of the described ODC gene promoter of amplification claim 1 is characterized in that having the nucleotide sequence shown in SEQ ID NO.2 and the SEQ ID NO.3.

3. a mosaic gene wherein comprises the described nicotine biosynthesizing of claim 1 ODC gene promoter and sequence that be operatively connected with it, the coding goal gene.

4. a plant conversion carrier wherein comprises mosaic gene claimed in claim 3.

5. a transgenic plant cells wherein comprises mosaic gene claimed in claim 3.

6. a transgenic plant tissue wherein comprises mosaic gene claimed in claim 3.

7. the described nicotine biosynthesizing of claim 1 ODC gene promoter or the described mosaic gene of claim 3 application in the biosynthesizing of regulation and control nicotine.

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