CN108865918A - A method of the gram-positive bacterium of label survival and its cell wall - Google Patents
A method of the gram-positive bacterium of label survival and its cell wall Download PDFInfo
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- CN108865918A CN108865918A CN201710321663.7A CN201710321663A CN108865918A CN 108865918 A CN108865918 A CN 108865918A CN 201710321663 A CN201710321663 A CN 201710321663A CN 108865918 A CN108865918 A CN 108865918A
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- glucosamine
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- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
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- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
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Abstract
The present invention relates to the methods that a kind of cell wall of gram-positive bacterium to survival is marked.The method passes through bio-orthogonal reaction; in the full acetylated N-acetyl-glucosamine -1- phosphoric acid incorporation whole cell peptidoglycan for being modified nitrine using the metabolic pathway of bacterium itself; it is then reacted by click chemistry, detectable marker is coupled to peptide glycan, to realize the label to bacterium peptide glycan.The method has universality, can be used for quickly and conveniently marking gram-positive bacterium.
Description
Technical field
The present invention relates to one kind by bio-orthogonal reaction, and the leather of survival is marked using the biosynthesis pathway of cell wall
The method of gram-positive bacteria.
Background technique
It is currently known the cell surface marker technology of various bacteria.For example, can be used expression can be with bacterial surface protein
In conjunction with target protein gene engineering method.However, such cellular degeneration necrosis method is only applicable to labelled protein and more
Peptides.Compared with genetic manipulation method, the chemical method based on metabolic pathway can be utilized by adding metabolic analogue small molecule
Latter functionalities label is covalently attached to different non-natural epitopes by the metabolic pathway of cell itself.
One of typical composition of gram positive bacterial cell wall is peptide glycan.Peptide glycan is a kind of network-like miscellaneous more
Sugar, skeleton are made of peptide and glycan two parts, and peptide therein includes bridge two parts between tetrapeptide tail and peptide, and glycan is by N- second
The long-chain that two kinds of monosaccharide of acyl aminoglucose (G) and -acetylmuramic acid (M) are alternately connected to by β -1,4 glycosidic bond.Eukaryocyte
In be free of peptide glycan, therefore, peptide glycan is good inhibits or the target of label bacterium.However currently, to peptide glycan in bacterium
In biosynthesis pathway know little about it.The research of peptide glycan is also only limitted to find it as the potential new of inhibitor target
Purposes.Nearly ten years, the research for the synthesis of peptide glycan being tracked or being edited makes great progress.The peptide reported recently
The imaging method of glycan including the use of fluorescent marker lectin (or antibody), using can act on cell wall with fluorescence
The antibiotic of label, the strategy based on the metabolic marker for carrying out detection or radioactive substance tracer to free mercaptan, using glimmering
The enzyme process etc. of light substrate.Although these technologies have been used to disclose the dynamic process of bacteria cell wall peptide glycan metabolism, however,
These technical operations are excessively many and diverse and resolution ratio is lower, and are only applicable to specific bacterium kind, in terms of the universality of application
There are significant limitations.In the above-described techniques, the antibody technique of fluorescent marker is because its is easy to operate, substance is molten in a short time
Solution property is higher and most widely used.However, the antibody of fluorescent marker can inhibit the activity of bacterium, it is difficult at the beginning of its labeling and growing
The gram-positive bacteria of phase.There are still the demands for not interfering the peptide glycan labeling method of bacterial growth at present.
Bio-orthogonal reaction refers to chemical reaction with the following characteristics:It carries out in physiological conditions, does not interfere while sending out
Raw other biochemical reactions or various biological endogenous processes, and organism and biological endogenous molecule will not be caused to damage.At present
Most common bio-orthogonal reaction group is to the azido-including click chemistry (Click Chemistry) reaction can occur
Alkynyl and azido-triaryl phosphine.Wherein, the staudinger reaction (Staudinger that azido and triaryl phosphine occur
A member with the bio-orthogonal reaction group centering can be connected by the cycloaddition reaction Ligation) or with alkynyl occurred
Sugar be coupled to the detectable marker being connected with another member of the bio-orthogonal reaction group centering, realize detectable mark
Note object is modified to the purpose of sugar.Wherein, the cycloaddition reaction (Strain-promoted of azido group and high-tension alkynes
Azide-alkyne cycloaddition, SPAAC) because it does not need to become research due to adding catalyst and applies hot spot.From
Since click chemistry reaction in 2001 is suggested, which has been widely used in surface modification, dendrimer and function
Generation, cell marking, biological medicine synthesis, nucleic acid or modification of carbon nanotube of polymer etc..CN104039977B is proposed
A method of gram-negative bacterial cell wall lipopolysaccharides is marked using azido-alkynyl bio-orthogonal reaction.However, at present
The method that the cell wall of gram-positive bacterium is marked is not reported also.
Summary of the invention
The present invention is directed to the metabolic pathways using gram-positive bacterium itself, and metabolic analogue small molecule is added to carefully
Cell wall, and the method that the gram-positive bacterium of survival and its cell wall are marked is developed based on bio-orthogonal reaction.
On the one hand, the purpose of the present invention is to provide a kind of method that the gram-positive bacterium to survival is marked,
Described method includes following steps:
(i) the full acetylated N-acetyl-glucosamine -1- phosphoric acid of nitrine modification is added in gram-positive bacterium culture medium,
Gram-positive bacterium is inoculated in the culture medium and the gram-positive bacterium is cultivated, obtains Bacteria Culture
Object;
(ii) bacterial cultures that collection step (i) obtains obtains the precipitating of the bacterial cultures by processing
Object;
(iii) bacterium in the sediment obtained to step (ii) is fixed;
(iv) to the detectable label for being connected with alkynyl or triaryl phosphine through adding in fixed bacterium of step (iii)
Object, so that the marker is coupled to the peptide glycan in the bacterium;
(v) detectable marker is detected.
On the other hand, the present invention provides the full acetylated N-acetyl-glucosamine -1- phosphoric acid of nitrine modification to be used for survival
Gram-positive bacterium the purposes that is marked of cell wall, wherein the full acetylated N- acetyl modified by the nitrine
The bio-orthogonal reaction of the azido of aminoglucose -1- phosphoric acid and the alkynyl or triaryl phosphine that are connected to detectable marker is realized
To the label of the cell wall of the gram-positive bacterium of survival.
Another aspect, the present invention provides nitrine modification full acetylated N-acetyl-glucosamine -1- phosphoric acid be used for comprising
The purposes of the gram-positive bacterium of survival is specifically marked in the sample of bacterium, wherein modify by the nitrine complete
The azido of acetylation N-acetyl-glucosamine -1- phosphoric acid be connected to detectable marker alkynyl or triaryl phosphine biology just
Reaction is handed over to realize the label of the cell wall to the gram-positive bacterium of survival.
In another aspect, the present invention provides a kind of for detecting the kit of the gram-positive bacterium of survival, wherein institute
State full acetylated N-acetyl-glucosamine -1- phosphoric acid that kit includes nitrine modification and be connected with alkynyl or triaryl phosphine can
Detect marker.
Detailed description of the invention
Fig. 1 is according to embodiment 2, the HPLC map of experimental group peptide glycan.
Fig. 2 is 6- azido methyl-N-acetyl-glucosamine LC-MS map in experimental group according to embodiment 2.
Fig. 3 is the LC-MS map of N-acetyl-glucosamine in experimental group according to embodiment 2.
Fig. 4 is according to embodiment 2, the HPLC map of control group peptide glycan.
Fig. 5 is according to embodiment 2, the LC-MS map of control group monosaccharide (N-acetyl-glucosamine).
Fig. 6 is according to embodiment 3, the fluorescence results figure (100 times of amplification factor) of experimental group BCG bacterium cell wall label.Its
In, 1 is light field, and 2 be the channel FITC, and 3 be the channel TXRED, and 4 be 1,2,3 stacking chart.
Fig. 7 is the enlarged drawing of the single bacterium in Fig. 6.Wherein, 1 is light field, and 2 be the channel FITC, and 3 be the channel TXRED, 4
For 1,2,3 stacking chart.
Fig. 8 is according to embodiment 3, the fluorescence results figure (100 times of amplification factor) of control group BCG bacterium cell wall label.Its
In, 1 is light field, and 2 be the channel FITC, and 3 be the channel TXRED, and 4 be 1,2,3 stacking chart.
Specific embodiment
The N- acetyl Portugal that the present invention is modified nitrine by the Biometabolic pathway of the peptide glycan in gram-positive bacterium
Osamine -1- phosphoric acid is introduced into the peptide glycan of gram positive bacterial cell wall, is drawn in a mild condition using bio-orthogonal reaction
Enter probe molecule (detectable marker), to realize the label to the gram positive bacterial cell wall of survival.Compared to making
With other labeling methods of genetic engineering, this method operates more simple.Due to the bone of whole gram positive bacterial cell walls
Frame is peptide glycan, and N-acetyl-glucosamine -1- phosphoric acid (GlcNAc-1P) is the synthesis precursor of peptide glycan, and this method is blue to leather
Family name's positive bacteria has universality.In addition, growth of the non-natural N-acetyl-glucosamine -1- phosphoric acid used in the present invention to bacterium
It is had little effect with activity, helps to realize quick, the convenient and fast label to gram-positive bacterium viable bacteria.
Term " gram-positive bacterium " used in the present invention has meaning well known in the art, that is, due to its cell
Wall main component can dye the bacterium of navy blue or purple for peptide glycan by Gram's staining.Present invention side can be used as
The gram-positive bacterium of method test object is the whole bacteriums for meeting gram-positive bacterium class definition, including but unlimited
In:Mycobacterium (Mycobacterium), staphylococcus (Staphylococcus), enterococcus spp
(Enterococcus), fusobacterium (Clostridium), Listeria (Listeria), streptococcus
(Streptococcus), bacillus (Bacillus), Corynebacterium (Corynebacterium) etc..Preferably, described
Gram-positive bacterium is selected from:Mycobacterium tuberculosis (Mycobacterium tuberculosis), staphylococcus aureus
(Staphylococcus aureus), streptococcus pneumonia (Streptococcus pneumoniae), bacillus anthracis
(Bacillus anthracis), corynebacterium diphtheriae (Corynebacterium diphtheriae), clostridium tetani
(Clostridium tetani)。
Peptide glycan is the main ingredient for constituting gram positive bacterial cell wall, it is by N-acetyl-glucosamine (G) and N-
Small peptide made of acetylmuramic acid (M) and four amino acid condensations is formed.This research is modified using non-natural nitrine
GlcNAc-1-P derivative can enter the peptide glycan of cell wall via the Cell wall synthesis approach of bacterium living, realize to leather
The label of gram-positive bacteria cell wall.
The free hydroxyl group of the full acetylated N-acetyl-glucosamine -1- phosphoric acid of nitrine modification in the present invention is all by acetyl
Change, so that the efficiency that the non-natural sugar was transported film is higher.In fact, the azido can be connected to by any way
Any one carbon atom in the glucose hexatomic ring of full acetylated N-acetyl-glucosamine -1- phosphoric acid.By making non-natural phosphate Portugal
The azido of osamine and alkynyl or triaryl phosphine progress bio-orthogonal reaction with detectable marker, by detectable marker
(that is, probe) is coupled to the peptide glycan of cell wall.
Preferably, the full acetylated N-acetyl-glucosamine -1- phosphoric acid of the nitrine modification is (2R, 3R, 4R, 5R, 6R) -5-
Acetylaminohydroxyphenylarsonic acid 2- (azido methyl) -6- (phosphono oxygroup) -3,4- diacetoxy-tetrahydro -2H- pyrans ((2R, 3R, 4R,
5R,6R)-5-acetamido-2-(azidomethyl)-6-(phosphonooxy)tetrahydro-2H-pyran-3,4-
Diyl diacetate) (referred to herein simply as 6N3- AcOGlcNAc-1P), structure is as shown in Equation 1.6N3-AcOGlcNAc-
1P synthetic method is known in the art dawn, and commercially available, for example, can through the invention in step described in embodiment 1 close
At.
Wherein, Ac is acetyl group, N3For azido group.
In the method for the invention, nitrine modification full acetylated N-acetyl-glucosamine -1- phosphoric acid can be connected with alkynes
The detectable marker of base or triaryl phosphine reacts, so that detectable marker to be coupled to the non-natural osamine of peptide glycan
(that is, full acetylated N-acetyl-glucosamine -1- phosphoric acid of nitrine modification) residue.
Detectable marker as described herein includes but is not limited to radioactive isotope, chromophore, antibody, chemiluminescence
Close object, spectral colorimetric mark object, fluorescent chemicals, metallo-chelate and enzyme.
Detectable marker used in method described herein can be primary marker (wherein, marker include can
The part for the signal that the part directly measured or generation can be measured directly) or secondary marker (wherein, detectable marker
Another reagent is bound to generate measurable signal).Detectable marker can be connected to by means covalently or non-covalently
Alkynyl/triaryl phosphine part.For example, detectable marker may be connected directly to alkynyl/triaryl phosphine part;Alternatively, detectable
Marker by ligand-receptor combine to, biotin-avidin (such as Streptavidin or ovum Avidin) gametophyte pair or its
Its such specific recognition molecules realize the connection with alkynyl or triaryl phosphine part.
In some embodiments, detectable marker can be fluorescent chemicals, such as luminescent dye molecule or fluorogen,
Including but not limited to:Fluorescein, such as 6- Fluoresceincarboxylic acid, 6- carboxyl -4 ', 5 '-two chloro- 2 ', 7 '-dimethoxyfluoresceins,
Fluorescein isothiocynate (FITC);Rhodamine and its derivative, such as N, N, N ', -6 carboxyrhodamine (TAMRA of N '-tetramethyl
Or T), 6- carboxy-X-rhodamine (ROX or R), 5- carboxyrhodamine -6G (R6G5 or G5), 6- carboxyrhodamine -6G (R6G6 or
G6), rhodamine 110, four rhodamine isothiocyanates (tetrarhodimine isothiocynate, TRITC);Cyan uniformly dyeing
Material, such as Cy3, Cy5 and Cy7 dyestuff;Cumarin, such as umbelliferone etc..Preferably, the fluorescent chemicals are N, N, N ', N '-
- 6 carboxyrhodamine of tetramethyl.
In some embodiments, detectable marker can be enzyme, and the enzyme as marker can produce for example chemical
Luminous signal, colourful signal or fluorescence signal, such as Fluc, Renilla luciferase.Alternatively, for detectably
The enzyme of labelled antibody reagent includes but is not limited to:Malic dehydrogenase, staphylococcal nuclease, δ-V- steroids heterologous enzyme,
Alcohol Dehydrogenase from Yeast, alpha-phosphate glycerol dehydrogenase, phosphotriose isomerase, horseradish peroxidase, alkaline phosphatase, asparagus fern acyl
Amine enzyme, glucose oxidase, beta galactosidase, ribalgilase, urase, catalase, glucose-VI-phosphate dehydrogenation
Enzyme, glucoamylase and acetylcholinesterase.
In some embodiments, detectable marker is chemiluminescence compound, including but not limited to:Lucigenin, Shandong
Minot, (adamantane) -1,2- dichloroethane, different luminol, imidazoles, acridinium ester, acridinium carboxamide, tris (bipyridine) ruthenium and oxalate.
In some embodiments, can measure marker can be spectral colorimetric mark object, including but not limited to:Colloidal gold
Or coloured glass or plastics (for example, polystyrene, polypropylene and latex) pearl.
In some embodiments, detectable marker can be radioactive isotope, including but not limited to:3H、125I、35S、14C、32P and33P。
In some embodiments, detectable marker includes any marker that can be determined by:Spectrum means;
Photochemistry means;Biochemistry means;Immunochemistry means;Electromagnetic means;Radiochemistry means;Or chemical means, such as it is glimmering
Light means, chemiluminescence means or chemiluminescence means or any other means appropriate.
In a preferred embodiment, detectable marker via biotin-avidin gametophyte to be connected to alkynyl or
Triaryl phosphine, the alkynyl or triaryl phosphine and azido form bio-orthogonal reaction group pair.
Preferably, the detectable marker for being connected with alkynyl is selected from the group as composed by following substance:
Wherein, describedIt is the detectable marker for being connected directly or indirectly to alkynyl moiety.
Preferably, the detectable marker for being connected with triaryl phosphine is selected from the group as composed by following substance:
Wherein, describedIt is the detectable marker for being connected directly or indirectly to triaryl phosphine part.
The synthetic method of above compound is known in the art or is obtained commercially.
In some preferred embodiments, alkynyl/triaryl phosphine detectable marker that is connected with is by containing
Dibenzazepine cyclo-octene-PEG4- biotin (the Dibenzocyclooctyne-PEG4-biotin of high-tension alkynes
Conjugate (DBCO-PEG4-biotin)) with Streptavidin-detectable marker (that is, be connected with Streptavidin can
Detect marker) conjugation acquisition.Shown in the structure such as formula (II-7) of the dibenzazepine cyclo-octene-PEG4- biotin:
In other preferred embodiments, the detectable marker for being connected with alkynyl or triaryl phosphine be containing
(Dibenzocycl-ooctyne (DBCO)-PEG4- of dibenzazepine cyclo-octene-PEG4- fluorescein 545 of power alkynes
Fluor545 or DBCO-PEG4-TAMRA), shown in structure such as formula (II-8).
Above-mentioned whole compound and a variety of detectable markers (radioactive isotope, hair for being modified with Streptavidin
Color group, antibody, chemiluminescence compound, spectral colorimetric mark object, fluorescent chemicals, metallo-chelate and enzyme) it is commercially available
It arrives.
Method of the invention can realize the label to gram-positive bacterium (such as mycobacterium tuberculosis), including walk as follows
Suddenly:
(i) the full acetylated N-acetyl-glucosamine -1- phosphoric acid of nitrine modification is added in gram-positive bacterium culture medium,
Gram-positive bacterium is inoculated in the culture medium and the gram-positive bacterium is cultivated, obtains Bacteria Culture
Object;
(ii) bacterial cultures that collection step (i) obtains obtains the precipitating of the bacterial cultures by processing
Object;
(iii) bacterium in the sediment obtained to step (ii) is fixed;
(iv) to the detectable label for being connected with alkynyl or triaryl phosphine through adding in fixed bacterium of step (iii)
Object, so that the marker is coupled to the peptide glycan in the bacterium;
(v) detectable marker is detected.
Inoculum density, condition of culture, incubation time of the gram-positive bacterium of step (i) etc. are this field for thin
The normal condition or parameter of bacterium culture.
Preferably, the full acetylated N-acetyl-glucosamine -1- phosphoric acid of the nitrine modification of step (i) is the formula (I)
Compound.Preferably, by the compound of the formula (I) with 120-200 μ g/mL, the final concentration of preferably 160 μ g/mL is added to
Culture medium.
It is described to be collected as routine operation in step (ii), for example, sterile water washing bacterium can be used for solid culture
The bacterial cultures that bacteria suspension is obtained as collection is come to, or liquid culture can be collected directly into centrifuge tube
Deng.Preferably, such as liquid culture pass through centrifugation after collection and obtain sediment.Further preferably, slow using PBSTB
The sediment for the bacterial cultures that fliud flushing is washed washes away unemployed non-natural compound (that is, the full second of nitrine modification
Acylated N-acetyl-glucosamine -1- phosphoric acid).In addition, the centrifugation is the routine operation of this field, those skilled in the art can root
According to the ordinary skill knowledge that it is grasped for the centrifugal rotational speed etc. that different gram-positive bacterium selections is suitable.
Preferably, in step (iii), bacterium is fixed using 4w/v% paraformaldehyde.Further preferably, in fixation
After be centrifuged, obtain bacterial precipitation and washed with PBSTB buffer, to wash away extra paraformaldehyde fixer.
It is preferred that before carrying out step (iv), by biotin-alkynyl moiety or biotin-triaryl phosphine part and strepto-
Avidin-detectable marker is coupled, and the detectable marker of alkynyl or triaryl phosphine is connected with described in formation.Alternatively, into
When row step (iv), to step (iii) through adding biotin-alkynyl moiety or biotin-triaryl phosphine in fixed cell
Streptavidin-detectable marker is then added in part, so that the marker is coupled to the intracellular sugared egg
It is white.
Preferably, the alkynyl or the detectable marker of triaryl phosphine of being connected with of step (iv) is the formula (II-8)
Compound.
It is not intended to be limited by theory ground, in above-mentioned reaction, being impregnated in the azido concentration of peptide glycan, determine can be by
In conjunction with the amount of formula (II-8) compound therefore azido is marked as long as guaranteeing that dosage can satisfy, without
Especially limitation.Preferably, the dosage of formula (II-8) compound is greater than 5mM.It is further preferred that described through fixed thin
The compound of the formula (II-8) of 10mM is added in bacterium.It is preferred that described through adding the formula (II-8) in fixed bacterium
Compound after be incubated for 1.5h.
The embodiment of various aspects described herein can be by the paragraph explanation numbered as follows:
1. a kind of method that the gram-positive bacterium to survival is marked, described method includes following steps:
(i) the full acetylated N-acetyl-glucosamine -1- phosphoric acid of nitrine modification is added in gram-positive bacterium culture medium,
Gram-positive bacterium is inoculated in the culture medium and the gram-positive bacterium is cultivated, obtains Bacteria Culture
Object;
(ii) bacterial cultures that collection step (i) obtains obtains the precipitating of the bacterial cultures by processing
Object;
(iii) bacterium in the sediment obtained to step (ii) is fixed;
(iv) to the detectable label for being connected with alkynyl or triaryl phosphine through adding in fixed bacterium of step (iii)
Object, so that the marker is coupled to the peptide glycan in the bacterium;
(v) detectable marker is detected.
2. the method as described in paragraph 1, wherein the full acetylated N-acetyl-glucosamine -1- phosphoric acid of nitrine modification is
(2R, 3R, 4R, 5R, 6R) -5- acetylaminohydroxyphenylarsonic acid 2- (azido methyl) -6- (phosphono oxygroup) -3,4- diacetoxy-four
Hydrogen -2H- pyrans.
3. the method as described in paragraph 1 or 2, wherein the detectable marker for being connected with alkynyl is selected from by as follows
Group composed by substance:
Wherein, the detectable marker for being connected with triaryl phosphine is selected from the group as composed by following substance:
Wherein, describedIt is the detectable marker for being connected directly or indirectly to alkynyl moiety or triaryl phosphine part.
4. the method as described in any one of paragraph 1-3, wherein the detectable marker is selected from:The same position of radioactivity
Element, chromophore, antibody, chemiluminescence compound, spectral colorimetric mark object, fluorescent chemicals, metallo-chelate and enzyme.
5. the method as described in paragraph 4, wherein the radioactive isotope is selected from:
3H、125I、35S、14C、32P and33P。
6. the method as described in paragraph 4, wherein the fluorescent chemicals are selected from:
Fluorescein, such as 6- Fluoresceincarboxylic acid, 6- carboxyl -4 ', 5 '-two chloro- 2 ', 7 '-dimethoxyfluoresceins, different sulphur cyanogen
Sour fluorescein);Rhodamine and its derivative, such as N, N, N ', -6 carboxyrhodamine of N '-tetramethyl, 6- carboxy-X-rhodamine,
5- carboxyrhodamine -6G, 6- carboxyrhodamine -6G, rhodamine 110, four rhodamine isothiocyanates;Cyanine dye, such as
Cy3, Cy5 and Cy7 dyestuff;Cumarin, such as umbelliferone etc.;
Preferably, the fluorescent chemicals are N, N, N ', -6 carboxyrhodamine of N '-tetramethyl.
7. the method as described in paragraph 4, wherein the enzyme is selected from Fluc, Renilla luciferase.
8. the method as described in paragraph 4, wherein the enzyme is selected from:
Malic dehydrogenase, staphylococcal nuclease, δ-V- steroids heterologous enzyme, Alcohol Dehydrogenase from Yeast, alpha-phosphate are sweet
Oily dehydrogenase, phosphotriose isomerase, horseradish peroxidase, alkaline phosphatase, asparaginase, glucose oxidase, β-
Galactosidase, ribalgilase, urase, catalase, glucose-VI-phosphate dehydrogenase, glucoamylase and acetyl
Cholinesterase.
9. the method as described in paragraph 4, wherein the chemiluminescence compound is selected from:
Lucigenin, luminol, (adamantane) -1,2- dichloroethane, different luminol, imidazoles, acridinium ester, acridinium carboxamide, three
Bipyridyl ruthenium and oxalate.
10. the method as described in paragraph 4, wherein the spectral colorimetric mark object is selected from:
Colloidal gold or coloured glass or plastic bead.
11. the method as described in any one of paragraph 1-10, wherein the detectable marker is connected directly to the alkynes
Base portion point or triaryl phosphine part, to be connected with the detectable marker of alkynyl or triaryl phosphine described in being formed.
12. the method as described in any one of paragraph 1-10, wherein the detectable marker is via ligand-receptor knot
Conjunction pair or biotin-avidin gametophyte are to the alkynyl moiety or triaryl phosphine part is connected to, to form the connection
There is the detectable marker of alkynyl or triaryl phosphine.
13. the method as described in paragraph 12, wherein the Avidin of the biotin-avidin gametophyte centering is strepto-
Avidin or ovum Avidin.
14. the method as described in paragraph 13, wherein before carrying out step (iv), by biotin-alkynyl moiety or biology
Element-triaryl phosphine part and Streptavidin-detectable marker are coupled, and be connected with alkynyl or triaryl phosphine described in formation can
Detect marker.
15. the method as described in paragraph 13, wherein when carrying out step (iv), to step (iii) through fixed cell
Streptavidin-detectable marker is then added in middle addition biotin-alkynyl moiety or biotin-triaryl phosphine part, from
And the marker is coupled to the intracellular glycoprotein.
16. the method as described in paragraph 14 or 15, wherein the biotin-alkynyl moiety is dibenzazepine cyclo-octene-
PEG4- biotin.
17. the method as described in paragraph 4, wherein the alkynyl or the detectable marker of triaryl phosphine of being connected with is two
Benzo-aza cyclo-octene-PEG4- fluorescein 545.
18. the method as described in any one of paragraph 1-17, wherein in step (ii), washed using PBSTB buffer
The sediment of the bacterial cultures.
19. the method as described in any one of paragraph 1-18, wherein in step (iii), using paraformaldehyde to described
Bacterium is fixed;It is preferred that being centrifuged to described through fixed bacterium after the fixation, obtains cell precipitation and use PBSTB
Buffer is washed.
20. the method as described in any one of paragraph 2-18, wherein (2R, 3R, 4R, 5R, 6R) -5- acetyl ammonia by described in
Base -2- (azido methyl) -6- (phosphono oxygroup) -3,4- diacetoxy-tetrahydro -2H- pyrans is with 120-200 μ g/mL, excellent
The final concentration of 160 μ g/mL is selected to be added to the culture medium.
21. the method as described in any one of paragraph 1-20, wherein the method is used for the thin of gram-positive bacterium
Cell wall is marked.
22. the method as described in any one of paragraph 1-21, wherein the gram-positive bacterium is selected from:
Mycobacterium, staphylococcus, enterococcus spp, fusobacterium, Listeria, streptococcus, bacillus
Belong to, Corynebacterium.
23. the method as described in any one of paragraph 1-21, wherein the gram-positive bacterium is selected from:
Mycobacterium tuberculosis, staphylococcus aureus, streptococcus pneumonia, bacillus anthracis, corynebacterium diphtheriae, clostridium tetani.
24. the full acetylated N-acetyl-glucosamine -1- phosphoric acid of nitrine modification is used for the gram-positive bacterium of survival
The purposes that cell wall is marked, wherein pass through the nitrine for the full acetylated N-acetyl-glucosamine -1- phosphoric acid that the nitrine is modified
The bio-orthogonal reaction of base and the alkynyl or triaryl phosphine that are connected to detectable marker realizes the Gram-positive to survival
The label of the cell wall of bacterium.
25. the full acetylated N-acetyl-glucosamine -1- phosphoric acid of nitrine modification is used for specific in the sample comprising bacterium
The purposes of the gram-positive bacterium of ground label survival, wherein the full acetylated N-acetyl-glucosamine-modified by the nitrine
The azido of 1- phosphoric acid and the bio-orthogonal reaction of the alkynyl or triaryl phosphine that are connected to detectable marker are realized to survival
Gram-positive bacterium cell wall label.
26. the purposes as described in paragraph 24 or 25, wherein the full acetylated N-acetyl-glucosamine -1- of the nitrine modification
Phosphoric acid is (2R, 3R, 4R, 5R, 6R) -5- acetylaminohydroxyphenylarsonic acid 2- (azido methyl) -6- (phosphono oxygroup) -3,4- diethyl acyl-oxygen
Base-tetrahydro -2H- pyrans.
27. the purposes as described in any one of paragraph 24-26, wherein the detectable marker is selected from:Radioactivity is same
Position element, chromophore, antibody, chemiluminescence compound, spectral colorimetric mark object, fluorescent chemicals, metallo-chelate and enzyme.
28. the purposes as described in paragraph 27, wherein the radioactive isotope is selected from:
3H、125I、35S、14C、32P and33P。
29. the purposes as described in paragraph 27, wherein the fluorescent chemicals are selected from:
Fluorescein, such as 6- Fluoresceincarboxylic acid, 6- carboxyl -4 ', 5 '-two chloro- 2 ', 7 '-dimethoxyfluoresceins, different sulphur cyanogen
Sour fluorescein);Rhodamine and its derivative, such as N, N, N ', -6 carboxyrhodamine of N '-tetramethyl, 6- carboxy-X-rhodamine,
5- carboxyrhodamine -6G, 6- carboxyrhodamine -6G, rhodamine 110, four rhodamine isothiocyanates;Cyanine dye, such as
Cy3, Cy5 and Cy7 dyestuff;Cumarin, such as umbelliferone etc.;
Preferably, the fluorescent chemicals are N, N, N ', -6 carboxyrhodamine of N '-tetramethyl.
30. the purposes as described in paragraph 27, wherein the enzyme is selected from Fluc, Renilla luciferase.
31. the purposes as described in paragraph 27, wherein the enzyme is selected from:
Malic dehydrogenase, staphylococcal nuclease, δ-V- steroids heterologous enzyme, Alcohol Dehydrogenase from Yeast, alpha-phosphate are sweet
Oily dehydrogenase, phosphotriose isomerase, horseradish peroxidase, alkaline phosphatase, asparaginase, glucose oxidase, β-
Galactosidase, ribalgilase, urase, catalase, glucose-VI-phosphate dehydrogenase, glucoamylase and acetyl
Cholinesterase.
32. the purposes as described in paragraph 27, wherein the chemiluminescence compound is selected from:
Lucigenin, luminol, (adamantane) -1,2- dichloroethane, different luminol, imidazoles, acridinium ester, acridinium carboxamide, three
Bipyridyl ruthenium and oxalate.
33. the method as described in paragraph 27, wherein the spectral colorimetric mark object is selected from:
Colloidal gold or coloured glass or plastic bead.
34. a kind of for detecting the kit of the gram-positive bacterium of survival, wherein the kit is repaired comprising nitrine
Full acetylated N-acetyl-glucosamine -1- the phosphoric acid of decorations and the detectable marker for being connected with alkynyl or triaryl phosphine.
35. the kit as described in paragraph 34, wherein the full acetylated N-acetyl-glucosamine -1- phosphorus of the nitrine modification
Acid is (2R, 3R, 4R, 5R, 6R) -5- acetylaminohydroxyphenylarsonic acid 2- (azido methyl) -6- (phosphono oxygroup) -3,4- diacetoxy -
Tetrahydro -2H- pyrans.
36. the kit as described in paragraph 34 or 35, wherein the detectable marker for being connected with alkynyl be selected from by
Group composed by following substance:
Wherein, the detectable marker for being connected with triaryl phosphine is selected from the group as composed by following substance:
Wherein, describedIt is the detectable marker for being connected directly or indirectly to alkynyl moiety or triaryl phosphine part.
37. the kit as described in any one of paragraph 34-36, wherein the detectable marker is selected from:Radioactivity
Isotope, chromophore, antibody, chemiluminescence compound, spectral colorimetric mark object, fluorescent chemicals, metallo-chelate and enzyme.
38. the kit as described in paragraph 37, wherein the radioactive isotope is selected from:
3H、125I、35S、14C、32P and33P。
39. the kit as described in paragraph 37, wherein the fluorescent chemicals are selected from:
Fluorescein, such as 6- Fluoresceincarboxylic acid, 6- carboxyl -4 ', 5 '-two chloro- 2 ', 7 '-dimethoxyfluoresceins, different sulphur cyanogen
Sour fluorescein);Rhodamine and its derivative, such as N, N, N ', -6 carboxyrhodamine of N '-tetramethyl, 6- carboxy-X-rhodamine,
5- carboxyrhodamine -6G, 6- carboxyrhodamine -6G, rhodamine 110, four rhodamine isothiocyanates;Cyanine dye, such as
Cy3, Cy5 and Cy7 dyestuff;Cumarin, such as umbelliferone etc.;
Preferably, the fluorescent chemicals are N, N, N ', -6 carboxyrhodamine of N '-tetramethyl.
40. the kit as described in paragraph 37, wherein the enzyme is selected from Fluc, Renilla luciferase.
41. the kit as described in paragraph 37, wherein the enzyme is selected from:
Malic dehydrogenase, staphylococcal nuclease, δ-V- steroids heterologous enzyme, Alcohol Dehydrogenase from Yeast, alpha-phosphate are sweet
Oily dehydrogenase, phosphotriose isomerase, horseradish peroxidase, alkaline phosphatase, asparaginase, glucose oxidase, β-
Galactosidase, ribalgilase, urase, catalase, glucose-VI-phosphate dehydrogenase, glucoamylase and acetyl
Cholinesterase.
42. the kit as described in paragraph 37, wherein the chemiluminescence compound is selected from:
Lucigenin, luminol, (adamantane) -1,2- dichloroethane, different luminol, imidazoles, acridinium ester, acridinium carboxamide, three
Bipyridyl ruthenium and oxalate.
43. the kit as described in paragraph 37, wherein the spectral colorimetric mark object is selected from:
Colloidal gold or coloured glass or plastic bead.
Embodiment
Tuberculosis is the chronic infectious disease as caused by bacillus tuberculosis typus humanus (M.tuberculosis), is world's model
The interior second largest communicable disease is enclosed, the drug target for treating tuberculosis at present is much Mycobacterium tuberculosis cell wall.In the present invention
Embodiment in, we using with the homologous mycobacterium tuberculosis var bovis of bacillus tuberculosis typus humanus as illustrative gram to be detected
Positive bacteria is marked its cell wall using method of the invention.
Experimental method used in following embodiments is conventional method unless otherwise specified.
The materials, reagents and the like used in the following examples is commercially available unless otherwise specified.Such as without spy
Do not mentionlet alone it is bright, whole reagents be purchased from Sigma-Aldrich.
Agents useful for same in embodiment:
7H9 culture medium:0.94g 7H9 culture medium powder, 0.4mL glycerol, 0.1mL are added in 180ml distilled water
Tween80,121 DEG C of sterilizing 10min.Use preceding increasing microbial inoculum OADC of the addition 20mL through filtration sterilization.
OADC:0.255g NaCl, 1.5g BSA-V, 0.6g glucose, 0.016g oleic acid are added in 30mL distilled water
Sodium, 0.0012g catalase (catalase), filtration sterilization.
PBS buffer solution (10mM):Solvent is water, solute NaH2PO4、Na2HPO4, KCl and NaCl, the solute
NaH2PO4、Na2HPO4, the concentration of KCl and NaCl in the PBS buffer solution be respectively 0.24g/L, 1.42g/L, 0.2g/L and
8.0g/L;The pH value of the PBS buffer solution is 7.4.
PBSTB buffer (10mM):Solvent is water, solute NaH2PO4、Na2HPO4, KCl, NaCl, BSA and polysorbas20,
The solute NaH2PO4、Na2HPO4, the concentration of KCl, NaCl, BSA and polysorbas20 in the PBS buffer solution be respectively
0.24g/L, 1.42g/L, 0.2g/L, 8.0g/L, 0.5w/v% and 0.1v/v%.The pH value of the PBSTB buffer is 7.4.
PB buffer solution:Solvent is water, solute NaH2PO4、Na2HPO4, the solute NaH2PO4、Na2HPO4Described
Concentration in PBS buffer solution is respectively 0.24g/L and 1.42g/L.The pH value of the PB buffer is 7.4.
TCA solution:10g trichloroacetic acid is dissolved in 100mL water, with magnetic stirrer until being completely dissolved.
Combination buffer (PH 7.5):Solvent is water, solute Tris, NaCl.Described solute Tris, NaCl are in the knot
The concentration for closing buffer is respectively 2.4g/L, 2.9g/L;The pH value of the combination buffer is 7.5.
545 (the Dibenzocycl-ooctyne of dibenzazepine cyclo-octene-PEG4- fluorescein of the alkynes containing tension
(DBCO)-PEG4-Fluor545) it is purchased from Sigma-Aldrich (article No. 760773).
Mycobacterium tuberculosis var bovis (Latin entitled Mycobacterium bovis, entitled Bacillus generally in the art
Calmette–Guérin):Bacterial strain is BCG bacterial strain/BCG Pasteur 1173P2, which has pUV3583c-GFP plasmid,
GFP can be expressed.BCG bacterial strain/BCG Pasteur1173P2 building and explanation refer to Fungal
biotransformation of tanshinone results in[4+2]cycloaddition with
sorbicillinol:evidence for enzyme catalysis and increased antibacterial
Activity, Wenni He etc., Applied Microbiology and Biotechnology, 2016.
Embodiment 1 (2R, 3R, 4R, 5R, 6R) -5- acetylaminohydroxyphenylarsonic acid 2- (azido methyl) -6- (phosphono oxygroup) -3,4-
Diacetoxy-tetrahydro -2H- pyrans (6N3- AcOGlcNAc-1P) chemical synthesis
6N3- AcOGlcNAc-1P's synthesizes using nitrogen acetylglucosamine as starting material progress.Synthesis path is as follows:
Wherein, Ac is acetyl group, N3For azido group, TS is p-toluenesulfonyl, and Me is methyl.
10.35g is added to methyl in 10.00g nitrogen acetylglucosamine (0.045mol) (being purchased from Sigma, article No. A3286)
Benzene sulfonyl chloride (0.054mol) is stirred to react overnight with 300ml pyridinium dissolution.45ml acetic anhydride (0.528mol) reaction is added
6h is spin-dried for pyridine with oil pump, then uses 1M hydrochloric acid and saturated sodium bicarbonate extracting and washing respectively.Merge organic phase, uses anhydrous slufuric acid
Sodium is dry.After being spin-dried for, compound (mobile phase is separated using column phase flash chromatography:Ethyl acetate/petroleum ether=2:1) syrup is obtained
Shape compound 6c (12.00g, yield 70%).To addition 4.00g sodium azide in 10.00g compound 6c (0.026mol)
(0.059mol) is dissolved in 150ml dimethylformamide, and 65 DEG C are heated to reflux 12h, uses saturated sodium-chloride and acetic acid second after being spin-dried for again
Ester extraction, is dried, filtered with anhydrous sodium sulfate, is spin-dried for, and separates compound (mobile phase using column phase flash chromatography:Ethyl acetate/
Petroleum ether=1:1) compound 6d (7.20g, yield 75%), is obtained.Sodium methoxide/methanol (1M) is added and adjusts pH to 9, at room temperature
After reacting 3h, H is used+Ion exchange resin neutralizes, and filters, is spin-dried for, obtains compound as white solid 6e (4.40g, yield
93%).In 10ml reaction system, to addition 112mg ATP (20mM) and 7.5mg N- in 54.1mg compound 6e (22mM)
1- kinases (NahK) (0.75mg/mL) of acetylaminohexose;Buffer is 100mM Tris-HCl (MgCl containing 10mM2),
pH9.0;Reaction temperature is 37 DEG C, reaction time 12h.It boils 5min and stops reaction, 12000g is centrifuged 5min, collects supernatant
Gel column is crossed after outstanding inspissation contracting, compound 6f (64mg, yield 90%) is obtained, with anisaldehyde chromogenic reagent.By 100mg chemical combination
Object 6f (0.31mmol) is dissolved to 10ml pyridine, and acetic anhydride (0.92mmol) reaction 6h is slowly added dropwise under ice bath, dissolves after being spin-dried for
It in methylene chloride, is successively washed using 1M hydrochloric acid and saturated sodium bicarbonate, merging organic phase is simultaneously dry with anhydrous sodium sulfate.It is spin-dried for
Afterwards, compound (mobile phase is separated using column phase flash chromatography:Ethyl acetate/methanol=1:1) compound as white solid 6 is obtained
(95mg, yield 75%), i.e. 6N3- AcOGlcNAc-1P, shown in structural formula such as formula (I).
6 Structural Identification of compound is as follows:1H NMR(500MHz,D2O):δ=5.38 (dd, 1H, J=7.1Hz, 3.2Hz, H-
1), 5.23 (t, 1H, J=9.5Hz), 5.07 (t, 1H, J=9.7Hz), 4.23 (dd, 2H, J=21.05,10.55Hz), 3.64-
3.56(m,1H),3.39-3.36(m,1H),2.01(s,3H),1.95(s,3H),1.90(s,3H).HRESIMS Caled for
C12H19N4O10P(M-H)-:409.0826;found m/z 409.0749.
The extraction of 2 mycobacterium tuberculosis peptide glycan of embodiment
In order to prove that formula (I) compound can be inserted into the peptide glycan of cell wall through bacterial metabolism, we are by formula (I)
Compound is incubated for jointly with mycobacterium tuberculosis var bovis, extracts its peptide glycan, or discharge monosaccharide with bacteriolyze enzymatic treatment, then use
HPLC-MS analyzes the ingredient of peptide glycan or monosaccharide.Wherein, lysozyme can act on the N- acetyl of peptide glycan molecule in specific manner
β-Isosorbide-5-Nitrae glycosidic linkage between muramic acid and N-acetyl-glucosamine is allowed to fracture and obtains monosaccharide.
(1) BCG bacterium is inoculated in respectively in two bottles of 2L glycerol alanine culture mediums, 37 DEG C are slightly shaken 10 days, keep BCG bacterium raw
It grows to mid-log phase.The formula (I) of the acquisition of embodiment 1 of final concentration of 160 μ g/mL is added in wherein one bottle of cell culture
Compound (experimental group), another bottle are added without any compound as negative control (control group), continue culture 7 days.
(2) bacterium of culture is centrifuged with 12000g revolving speed, and is rinsed with PBS buffer solution, 100 DEG C of high temperature are boiled inactivation.
With 0.22 μm of membrane filtration, bacterial cell is separated with culture medium, obtain 9g bacterial cell (weight in wet base), with 4.5ml TSE (10mM
Tris-HCl, 150mM NaCl and 1mM EDTA) cell is resuspended, 4 DEG C of high pressures of instrument (JNBIO-Mini) are crushed with cryogenic high pressure
(1500bar) is broken, will be centrifuged 20min in 4 DEG C, 2500g through broken cell suspending liquid, removes unbroken cell and broken
Piece collects supernatant, in 4 DEG C, 27000g, is centrifuged 1h, obtains cell wall.
(3) after the dodecyl sodium sulfate (SDS) of 8w/v% is added into cell wall, boiling water bath boils 10min, is cooled to
After room temperature, 12000r/min is centrifuged 15min and collects precipitating.It is washed repeatedly with PBS buffer solution until being precipitated to non-foam.It will obtain
Precipitating be added to 0.lmol/L, pH value 7.8 PB buffer solution (trypsase containing 3mg/ml) in handle 3h, then will
Mixed liquor collects supernatant in 3000r/min centrifugation 5min.Gained supernatant 12000r/min centrifugation 15min is collected into precipitating.
(4) the resulting precipitating TCA solution of 10g/dL last in step (3) is resuspended, it is cold after 90 DEG C of water-bath 20min
But to room temperature.12000r/min is centrifuged 15min, collects precipitating, is washed with distilled water three times.
(5) precipitating that step (4) obtain is resuspended with ether, 12000r/min is centrifuged 15min again after standing 30min, receives
Collection precipitating, is dehydrated, 70 DEG C of dryings with dehydrated alcohol, obtains peptide glycan.
(6) bacterium in the PBS of 3.5ml by step (1) culture dilutes, ultrasonotomography.Mutanolysin (is bought from Sa
Grace chemical technology Co., Ltd, article No.:A07M9901) (purchase is dissolved to 500 from magnificent Boulder hundred million, article No. CL6951) with lysozyme
In the Tris-HCl (0.5mM, pH6.5) of μ l, its final concentration is made to be respectively 150 μ g/ml and 100 μ g/ml, then and ultrasonotomography
The fragment of acquisition is slowly mixed together, and incubates 4h at 37 DEG C.Sample is heated 5 minutes at 90 DEG C, lysozyme and bacteriolyze enzyme-deactivating will be become.
(7) it is carried out using appearance situation of the HPLC-MS to the monosaccharide of step (5) peptide glycan obtained and step (6) acquisition
Detection.
HPLC condition is as follows:Using Nova-Pak C18 (3.9 × 150mm, 4 μm) chromatographic column, with 20mM triethylamine-acetic acid
It (pH4.0) is mobile phase, flow velocity 0.5mL/min, Detection wavelength 260nm, column temperature is room temperature.
Fig. 1 is the HPLC map of experimental group peptide glycan.Fig. 2 is 6- azido methyl-N- Acetylglucos in experimental group monosaccharide
The LC-MS map of amine.Fig. 3 is the LC-MS map of N-acetyl-glucosamine in experimental group.Experimental group is extracted it can be seen from Fig. 1-3
Peptide glycan can find two obvious peaks in monosaccharide molecule amount range:Nitrogen acetylglucosamine (Glc-NAc, M=221.08) and
6- azido methyl-N-acetyl-glucosamine (6N3- GlcNAc, M=246.10).
Fig. 4 is the HPLC map of BCG bacterium peptide glycan in control group.Fig. 5 is the LC-MS figure of nitrogen acetylglucosamine in control group
Spectrum.By Figure 4 and 5 it is found that when formula (I) compound that embodiment 1 obtains is not added in the medium, the BCG bacterium institute cultivated
The peptide glycan of extraction only finds an obvious peak in monosaccharide molecule amount range:N-acetyl-glucosamine (Glc-NAc, M=
221.08), without 6N3The peak of-GlcNAc.
The compound of the provable formula of result above (I) can be inserted into peptide glycan.
The label of 3 Mycobacterium tuberculosis cell wall of embodiment
(i) prepare two bottles of 2L glycerol alanine culture mediums, what one bottle of embodiment 1 that final concentration of 160 μ g/mL is added obtained
The compound (experimental group) of formula (I), another bottle are added without any compound as negative control (control group), it is raw will to be in logarithm
Long-term mycobacterium tuberculosis (BCG bacterium) is inoculated in above-mentioned culture medium respectively, and 37 DEG C are cultivated 14 days, obtains cell culture fluid.
(ii) cell suspension that collection step (i) obtains, 12000g centrifugation, obtains the precipitating of the cell;It is used after centrifugation
PBSTB buffer rinses bacterium precipitating 3 times.
(iii) cell in the precipitating obtained with 4w/v% formaldehyde to step (ii) fixes 20min, then uses PBSTB
Buffer rinses three times.
(iv) it is incubated at room temperature to step (iii) through adding 10mM DBCO-PEG4-Fluor545 in fixed cell
1.5h, so that red fluorescence marker to be coupled to the peptide glycan in bacterium.
(v) detectable marker is detected using Laser Scanning Confocal Microscope.
As a result as shown in figs 6-8.
Fig. 6 is the fluorescence photo of the label of experimental group BCG bacterium cell wall under 100 times of mirrors.As shown in Figure 6, wherein (1) be
The form of the BCG bacterium observed under light field;(2) for the channel FITC as a result, display BCG bacterium expression GFP (absorption peak 395nm,
Emission peak 509nm) distribution;It (3) is the channel TXRED as a result, display Fluor545 (absorption peak 545nm, emission peak 567nm)
Distribution;It (4) is the stacking chart of (1)-(3).It can be seen that BCG bacterium surface there are red fluorescence (Fig. 6 (3)), illustrate formula (I)
Compound is by pass flag on the cell wall of mycobacterium tuberculosis.
Fig. 7 is the enlarged drawing (100 times of amplification factor) of a bacterium in Fig. 6.Wherein, (1) is the BCG observed under light field
The form of bacterium;It (2) is the channel FITC as a result, point of the GFP (absorption peak 395nm, emission peak 509nm) of display BCG bacterium expression
Cloth;It (3) is the channel TXRED as a result, the distribution of display Fluor545 (absorption peak 545nm, emission peak 567nm);(4) it is (1)-
(3) stacking chart.It can be seen that GFP and Fluor545 common location, illustrate that the compound of formula (I) is divided by pass flag in tuberculosis
On the cell wall of branch bacillus.
Fig. 8 is the fluorescence photo that control group BCG bacterium cell wall marks under 100 times of mirrors.As shown in Figure 8, wherein (1) be bright
The form of the BCG bacterium observed off field;It (2) is the channel FITC as a result, GFP (absorption peak 395nm, the hair of display BCG bacterium expression
Penetrate peak 509nm) distribution;It (3) is the channel TXRED as a result, showing Fluor545 (absorption peak 545nm, emission peak 567nm)
Distribution;It (4) is the stacking chart of (1)-(3).It can be seen that illustrating that cell wall is not labeled without any signal in figure (3).
Above-described embodiment demonstrates the full acetylated N- of analog-nitrine modification of peptide glycan synthesis precursor GlcNAc-1P
Acetylglucosamine -1- phosphoric acid can be utilized by the GlmU enzyme of mycobacterium tuberculosis itself, and Mycobacterium tuberculosis cell has been arrived in metabolism
On wall, so as to be used to realize the label to the Mycobacterium tuberculosis cell wall of survival.
Claims (4)
1. a kind of method that the gram-positive bacterium to survival is marked, described method includes following steps:
(i) the full acetylated N-acetyl-glucosamine -1- phosphoric acid that nitrine modification is added in gram-positive bacterium culture medium, will remove from office
Gram-positive bacteria is inoculated in the culture medium and cultivates the gram-positive bacterium, obtains bacterial cultures;
(ii) bacterial cultures that collection step (i) obtains obtains the sediment of the bacterial cultures by processing;
(iii) bacterium in the sediment obtained to step (ii) is fixed;
(iv) detectable marker of alkynyl or triaryl phosphine is connected with through adding in fixed bacterium to step (iii), from
And the marker is coupled to the peptide glycan in the bacterium;
(v) detectable marker is detected.
2. the full acetylated N-acetyl-glucosamine -1- phosphoric acid of nitrine modification is used for the cell wall to the gram-positive bacterium of survival
The purposes being marked, wherein the azido for the full acetylated N-acetyl-glucosamine -1- phosphoric acid modified by the nitrine and company
The bio-orthogonal reaction of the alkynyl or triaryl phosphine that are connected to detectable marker is realized to the gram-positive bacterium of survival
The label of cell wall.
3. the full acetylated N-acetyl-glucosamine -1- phosphoric acid of nitrine modification in the sample comprising bacterium for specifically marking
The purposes of the gram-positive bacterium of survival, wherein the full acetylated N-acetyl-glucosamine -1- phosphoric acid modified by the nitrine
Azido and the alkynyl or triaryl phosphine that are connected to detectable marker bio-orthogonal reaction it is blue to the leather of survival to realize
The label of the cell wall of family name's positive bacteria.
4. a kind of for detecting the kit of the gram-positive bacterium of survival, wherein the kit includes nitrine modification
Full acetylated N-acetyl-glucosamine -1- phosphoric acid and the detectable marker for being connected with alkynyl or triaryl phosphine.
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CN114790435B (en) * | 2021-01-25 | 2023-11-17 | 山东大学 | Bacillus subtilis engineering strain for synthesizing clickable glycosaminoglycan skeleton and construction method and application thereof |
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