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 PDF

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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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李学兵
丁超
孙欢
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Institute of Microbiology of CAS
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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

A method of the gram-positive bacterium of label survival and its cell wall
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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CN114423773A (en) * 2019-07-25 2022-04-29 西纳福克斯股份有限公司 Synthesis of 6-azido-6-deoxy-2-N-acetyl-hexosamine-nucleoside diphosphate
CN111733102A (en) * 2020-06-30 2020-10-02 东南大学 Gram-positive bacterium surface modification method based on tyrosinase catalysis and application thereof
CN111733102B (en) * 2020-06-30 2023-08-18 东南大学 Tyrosinase catalysis-based gram-positive bacterium surface modification method and application thereof
CN114790435A (en) * 2021-01-25 2022-07-26 山东大学 Bacillus subtilis engineering strain for synthesizing click-reaction glycosaminoglycan skeleton and construction method and application thereof
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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