CN103483440B - Fish-source anti-freezing polypeptide and preparation method thereof - Google Patents
Fish-source anti-freezing polypeptide and preparation method thereof Download PDFInfo
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Abstract
The invention provides a fish-source anti-freezing polypeptide and a preparation method thereof. Fish skin collagen is used as a raw material which is subject to enzymolysis of papain and then separated and purified to obtain the purified specific anti-freezing polypeptide, and the amino acid complete sequence is Lys-Gly-Glu-Ala-Gly-Asp-Asn-Gly-Ala-Lys-Gly-Asp-Ala-Gly-Ser-Pro-Gly. The invention breaks through the extant research concepts and methods of the anti-freezing protein at home and abroad, avoids limitation on quantity of anti-freezing protein purified from natural living bodies and safety worries about applying the transgenic anti-freezing protein to food from the international FDA (Food and Drug Administration), and acquires the food-source-based efficient anti-freezing polypeptide, thereby laying a theoretical basis for developing the food-source-based anti-freezing polypeptide and exploring the wide application of the food-source-based anti-freezing polypeptide to food and medicines.
Description
Technical field
The present invention relates to a kind of antifreeze peptide, related more specifically to a kind of source of fish antifreeze peptide and preparation method thereof, belonged to biological technical field.
Background technology
Food and medicine product suffers the problem of ice-crystal growth and recrystallization more and more to receive the concern of people repeatedly due to the fluctuation change of envrionment temperature in low-temperature storage and transportation.The lifting repeatedly of temperature makes ice crystal constantly grow, freeze thawing and recrystallization, havoc biological cells and tissues structure and lose the due quality of product.Worldwide scientist is faced with serious challenge: how to control ice-crystal growth and recrystallization, and the ice-crystal growth realized on low temperature cold chain controls, and is the key point restricting numerous food and medicine product quality.
Antifreeze protein, also claims " ice structural protein ", is that a class is attached to ice crystal surface and suppresses the growth of ice crystal and the active protein of recrystallization.Antifreeze protein controls ice-crystal growth because it has, reduce cell injury and keep the feature of product original weave construction, quality and quality and outstanding meaning and become hot research theme.Same research also shows, the Activity of Antifreeze segment of antifreeze protein be only present in local specific polypeptides hinge domain and be not overall protein in action, even sublimed antifreeze protein, Activity of Antifreeze is often not high, still needs to probe into its active territory and improves freeze proof efficiency further.So, how to obtain the high reactivity antifreeze peptide of the compact construction of food source, just become the research direction that antifreeze protein is urgent.
Summary of the invention
In order to solve the problem, the invention provides a kind of antifreeze peptide utilizing papain enzymolysis fish source collagen albumen to prepare, Activity of Antifreeze is realized efficiently.
A kind of antifreeze peptide of the present invention is the polypeptide be made up of 17 amino acid.The aminoacid sequence of described polypeptide is: Lys-Gly-Glu-Ala-Gly-Asp-Asn-Gly-Ala-Lys-Gly-Asp-Ala-Gly-Ser-Pro-Gly.
The preparation method of antifreeze peptide provided by the invention: with the fish source collagen albumen of fish-skin, fish scale for raw material, carry out enzymolysis to it, carries out separation and purification by enzymolysis product and obtains described antifreeze peptide.
The enzymatic hydrolysis condition that the present invention further provides a kind of preparation method of described antifreeze peptide is: papoid: fish source collagen albumen=1:10-15(w/w), pH is 7.0, temperature is 35 DEG C-40 DEG C, enzymolysis time is 20-40 minute.Wherein preferred scheme is: papoid: fish source collagen albumen=1:10(w/w), pH is 7.0, temperature is 37 DEG C, enzymolysis time is 30 minutes.
The present invention also provides the step of the separation and purification of the preparation method of described antifreeze peptide to be: first enzymolysis product utilizes Sephadex G-50 gel chromatography to be separated, and elutriant is deionized water, and flow velocity is 2mL/min, and elution peak is measured under 225nm; Collect and have the peak of best Activity of Antifreeze, then be separated with Sulfopropyl-Sepadex C-25 cation-exchange chromatography, the phosphoric acid buffer of elutriant to be NaCl concentration gradient the be 0.01mol/L pH7.0 of 0-0.5 M, flow velocity is 0.5mL/min; Collect the peak with best Activity of Antifreeze, RP-HPLC-C18 RPLC is utilized further to be separated again, the separation condition of reversed-phase HPLC is as elutriant gradient elution with 10%-90% (v/v) acetonitrile solution, flow velocity is 1mL/min, collect the elution peak at 25% acetonitrile and 75 % water (v/v) places, obtain described antifreeze peptide.
In order to realize such scheme, the concrete steps that the present invention takes are as follows:
(1) optimization of gelatin enzymatic hydrolysis condition
The enzyme that this technology adopts and fish (fish-skin, fish scale) collagen protein are purchased from Sigma biological reagent company (Chinese Shanghai, enzyme 600u/mg alive).Adopt experiment of single factor, respectively three enzymolysis factors are investigated, be respectively hydrolysis temperature 35 DEG C, 37 DEG C, 40 DEG C, 45 DEG C and 50 DEG C, enzymolysis time 10,20,30,40 and 60 minutes and enzyme-fish source collagen albumen proportioning 1:100,1:50,1:20,1:15 and 1:10 w/w.Take 1.65 grams of fish source collagen protein dissolutions in 6ml Mili-Q water, then use 2mol/L NaOH by its pH regulator to 7.0.First this solution water-bath is heated to and needs temperature, then add the enzyme of respective amount again by different enzyme-substrate proportionings, start reaction according to the predetermined reaction times.Then go out enzyme 10 minutes again in boiling water bath, centrifugal 10 minutes of 1000rpm again after cooling.After supernatant collection, respectively its Activity of Antifreeze is measured, to determine optimum enzymolysis condition.The enzymatic hydrolysis condition obtaining the enzymolysis solution with maximum Activity of Antifreeze is: pH is 7.0, temperature is 37 DEG C, enzymolysis time is 30 minutes, enzyme-substrate proportioning is 1:10.
(2) separation of enzymolysis product, purifying
First under optimum enzymolysis condition, carry out enzymolysis, the enzymolysis product obtained first is separated through Sephadex G-50 gel chromatography (long 100cm, diameter 2.6cm), and elutriant is deionized water, and flow velocity is 2mL/min, and elution peak is measured under 225nm.Collect the peak with best Activity of Antifreeze, use Sulfopropyl-Sepadex C-25 cation-exchange chromatography (long 55cm again, diameter 2.0cm) be separated, the phosphoric acid buffer of elutriant to be NaCl concentration gradient the be 0.01mol/L pH7.0 of 0-0.5 M, flow velocity is 0.5mL/min.Collect the peak with best Activity of Antifreeze, RP-HPLC RPLC is utilized further to be separated again, the separation condition of reversed-phase HPLC is that flow velocity is 1mL/min, obtains highly purified specificity antifreeze peptide with 10-90% acetonitrile solution as elutriant.
(3) test of Activity of Antifreeze
The present invention, according to the standard of international antifreeze protein Activity determination, sets up Activity of Antifreeze detection system.Activity of Antifreeze adopts the provide protection of detection antifreeze peptide to low temperature freeze thawing bacterium to test.
(4) determined amino acid sequence
Utilize protein sequencer (Applied Biosystems Model 476A, Perkin Elmer Co. MA, U.S.A) overall amino acid sequence that measures specificity antifreeze peptide is: Lys-Gly-Glu-Ala-Gly-Asp-Asn-Gly-Ala-Lys-Gly-Asp-Ala-Gly-Ser-Pro-Gly.
The present invention is only present in special peptide chain structure territory instead of overall protein theoretical basis in action based on the Activity of Antifreeze segment of antifreeze protein, to come from fish source collagen albumen for starting material, be conceived to be controlled by the cutting condition of papoid, be cut into the active polypeptide with specific peptide chain length and structural domain composition, and Activity of Antifreeze is realized efficiently.The present invention is that exploitation is based on the antifreeze peptide of food source and explore its widespread use based theoretical in food, medicine.
Accompanying drawing explanation
The CLC-HPLC-C18 color atlas of Fig. 1 purifying collagen of fish skin antifreeze peptide;
The specificity antifreeze peptide of Fig. 2 purifying is to the low-temperature protection effect of bulgaricus ccm; Wherein, A, B in figure represent respectively do not add specificity antifreeze peptide sample bulgaricus ccm, add 0.5%(w/w) the bulgaricus growth situation map of specificity antifreeze peptide sample.
Embodiment
Antifreeze peptide of the present invention is the polypeptide be made up of 17 amino acid.The overall amino acid sequence of described polypeptide is: Lys-Gly-Glu-Ala-Gly-Asp-Asn-Gly-Ala-Lys-Gly-Asp-Ala-Gly-Ser-Pro-Gly.
Preparation method is as follows:
With fish source collagen albumen for raw material, papoid is used to carry out enzymolysis to it, and according to the standard of international antifreeze protein Activity determination, set up Activity of Antifreeze detection system, optimize its enzymatic hydrolysis condition, the enzymatic hydrolysis condition obtaining the enzymolysis solution with maximum Activity of Antifreeze is: enzymolysis pH is 7.0, temperature is 37 DEG C, enzymolysis time is 30 minutes, enzyme-substrate proportioning is 1:10; Under optimum enzymolysis condition, carry out enzymolysis, the enzymolysis product obtained first is separated through Sephadex G-50 gel chromatography (long 100cm, diameter 2.6cm), and elutriant is deionized water, and flow velocity is 2mL/min, and elution peak is measured under 225nm.Collect the peak with best Activity of Antifreeze, use Sulfopropyl-Sepadex C-25 cation-exchange chromatography (long 55cm again, diameter 2.0cm) be separated, the phosphoric acid buffer of elutriant to be NaCl concentration gradient the be 0.01mol/L pH7.0 of 0-0.5M, flow velocity is 0.5mL/min.Collect the peak with best Activity of Antifreeze, utilize RP-HPLC-C18 RPLC (long 15cm, diameter 0.8cm) be further separated again, the separation condition of reversed-phase HPLC is as gradient eluent with 10-90% acetonitrile solution, flow velocity is 1mL/min, the mixed solution of self-contained 10% acetonitrile of elutriant and 90% water (v/v) starts, mixed solution to 90% acetonitrile and 10% water (v/v) terminates, carry out gradient elution, collect the elution peak at 25% acetonitrile and 75 % water (v/v) places, obtain highly purified specificity antifreeze peptide.
Lyophilize obtains antifreeze peptide of the present invention, is the polypeptide be made up of 17 amino acid.The overall amino acid sequence of described polypeptide is: Lys-Gly-Glu-Ala-Gly-Asp-Asn-Gly-Ala-Lys-Gly-Asp-Ala-Gly-Ser-Pro-Gly.
The instrument that the present invention adopts, detection means are as follows:
The Activity of Antifreeze detection system preparing antifreeze peptide of the present invention, adopts low temperature freeze thawing bacterium, detects and adds antifreeze peptide to the growth protecting effect after the freeze thawing of bacterium low temperature.The bulgaricus ccm of activation to be inoculated in liquid nutrient medium 37 DEG C, seed liquor, as seed liquor, is inoculated in new liquid nutrient medium with the ratio of 1:100 by 130r/min shaking table overnight incubation, and 37 DEG C, 130r/min shaking table is cultured to OD
600about=1.0.Get the sterilized centrifuge tube of some 1.5mL, adding concentration degerming is after filtration 250 μ g/mL testing sample 900 μ L, by bacterium liquid dilution 10
4doubly, draw 100 μ L and be added in testing sample, mixing, coating, be inverted in incubator for 37 DEG C and cultivate 18h, meter colony number.Remaining sample-bacterium liquid mixed solution is placed in-20 DEG C of subzero treatment 24h, take out melt and be coated with, in incubator 37 DEG C be inverted cultivate 18h, count colony number, often group do two parallel, then calculate the survival rate of bulgaricus ccm.Separately do the survival rate of the bulgaricus ccm not adding specificity antifreeze peptide for contrast.
The multiple separation and purification means such as application Sephadex G-50 molecular sieve, Sepharose SP C-25 ion-exchange chromatography, RP-HPLC RPLC, dialysis, realize the high efficiency separation purifying of the special antifreeze peptide of remarkable activity.
Protein sequencer (Applied Biosystems Model 476A, Perkin Elmer Co. MA, U.S.A) is utilized to measure the overall amino acid sequence of specificity antifreeze peptide.
In order to understand content of the present invention, Characteristic further, hereby exemplify following examples:
embodiment 1
Take 1.65 grams of collagen of fish skin to be dissolved in 6ml Mili-Q water, then use 2mol/L NaOH by its pH regulator to 7.0.First this solution water-bath is heated to 37 DEG C, the ratio being then 1:10 according to enzyme-substrate proportioning again adds the enzyme of respective amount, and enzymolysis time is 30 minutes.Then go out enzyme 10 minutes in boiling water bath, and centrifugal 10 minutes of 14000rpm again after cooling, collects supernatant liquor for subsequent use.
Be separated by supernatant liquor Sephadex G-50 gel chromatography (long 100cm, diameter 2.6cm), elutriant is deionized water, and flow velocity is 2mL/min, and elution peak is measured under 225nm, collects the elution peak with best Activity of Antifreeze.
The elution peak with best Activity of Antifreeze of Sephadex G-50 gel chromatography separation is carried out again to next step separation, with Sulfopropyl-Sepadex C-25 cation-exchange chromatography (long 55cm, diameter 2.0cm) be separated, the phosphoric acid buffer of elutriant to be NaCl concentration gradient the be 0.01mol/L pH7.0 of 0-0.5M, flow velocity is 0.5mL/min.Collect each peak sample and measure Activity of Antifreeze, the sample obtaining best Activity of Antifreeze utilizes RP-HPLC-C18 RPLC to carry out further separation and purification again.The mixed solution of self-contained 10% acetonitrile of elutriant and 90% water (v/v) starts, mixed solution to 90% acetonitrile and 10% water (v/v) terminates, and carries out gradient elution, collects the elution peak at 25% acetonitrile and 75 % water (v/v) places, obtain highly purified specificity antifreeze peptide of the present invention, as shown in Figure 1.ZP2 peak is the chromatographic peak of this specificity antifreeze peptide.
In Fig. 2; the survival rate that with the addition of the bulgaricus ccm of the specificity antifreeze peptide (Fig. 2 B) of 0.5% (w/w) is 88.5%; compared with contrast (Fig. 2 A), the specificity antifreeze peptide of visible purifying has the ability of very strong bacterium low-temperature protection.
Protein sequencer (Applied Biosystems Model 476A, Perkin Elmer Co. MA, U.S.A) is utilized to measure the aminoacid sequence of specificity antifreeze peptide to the specificity antifreeze peptide of purifying.The overall amino acid sequence of described polypeptide is: Lys-Gly-Glu-Ala-Gly-Asp-Asn-Gly-Ala-Lys-Gly-Asp-Ala-Gly-Ser-Pro-Gly.
Sequence table
<110> University of Fuzhou
<120> source of fish antifreeze peptide and preparation method thereof
<160> 1
<210> 1
<211> 17
<212> PRT
<213> artificial sequence
<400> 1
Lys Gly Glu Ala Gly Asp Asn Gly Ala Lys Gly Asp Ala Gly Ser Pro
1 5 10 15
Gly
Claims (1)
1. an antifreeze peptide, is characterized in that: the aminoacid sequence of described polypeptide is: Lys-Gly-Glu-Ala-Gly-Asp-Asn-Gly-Ala-Lys-Gly-Asp-Ala-Gly-Ser-Pro-Gly.
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| CN107629113B (en) * | 2017-11-02 | 2023-09-15 | 中国海洋大学 | Method for identifying Pacific cod skin collagen |
| CN107759663B (en) * | 2017-11-02 | 2023-06-30 | 中国海洋大学 | Method for identifying nile tilapia skin collagen |
| CN112167314B (en) * | 2020-09-10 | 2022-06-21 | 长沙沃霖农副产品开发有限公司 | Seafood fresh-keeping method |
| CN112641084A (en) * | 2021-01-15 | 2021-04-13 | 平顶山天晶植物蛋白有限责任公司 | Preparation method of antifreeze soybean protein isolate |
| CN113717251B (en) * | 2021-08-24 | 2023-06-02 | 华中农业大学 | Grass carp scale high-activity antifreeze polypeptide and preparation method thereof |
| CN115043909B (en) * | 2022-06-20 | 2024-07-12 | 福州大学 | Globefish skin antifreeze peptide and preparation method and application thereof |
Citations (1)
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|---|---|---|---|---|
| CN101921311A (en) * | 2010-09-10 | 2010-12-22 | 福州大学 | Anti-freeze polypeptide prepared by enzymolysis of cow leather collagen through papain |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101921311A (en) * | 2010-09-10 | 2010-12-22 | 福州大学 | Anti-freeze polypeptide prepared by enzymolysis of cow leather collagen through papain |
Non-Patent Citations (3)
| Title |
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| 天然抗冻多肽的制备、分离及细菌低温保护活性研究;赵珺 等;《福州大学学报( 自然科学版)》;20130228;第41卷(第1期);121-126 * |
| 鲨鱼皮明胶多肽的纯化与生物活性研究;江勇 等;《中国食品学报》;20130531;第13卷(第5期);53-61 * |
| 鲨鱼皮明胶水解肽的制备、分离纯化与抗氧化活性研究;江勇 等;《中国食品学报》;20120331;第12卷(第3期);28-33 * |
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