CN111909238A

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Publication number: CN111909238A
Application number: CN202010850743.3A
Authority: CN
Inventors: 谢宁宁; 黄晶晶; 鄢嫣; 张福生; 余敏
Original assignee: Institute of Agro Products Processing of Anhui Academy of Agricultural Sciences
Current assignee: Institute of Agro Products Processing of Anhui Academy of Agricultural Sciences
Priority date: 2017-06-29
Filing date: 2017-06-29
Publication date: 2020-11-10
Anticipated expiration: 2037-06-29
Also published as: CN111925411A; CN107337709A; CN112094316A; CN112094316B; CN107337709B; CN111925411B; CN111909238B

Abstract

The present invention relates to the technical field of synthetic peptides. The invention provides a high-zinc-chelation-activity zinc chelating peptide containing Ser-Cys and application thereof, wherein the high-zinc-chelation-activity zinc chelating peptide containing Ser-Cys is tripeptide containing Ser-Cys, and the amino acid sequence of the high-zinc-chelation-activity zinc chelating peptide containing Ser-Cys comprises the following components: one or two of Ala-Ser-Cys and Cys-Ser-Cys. The invention provides a novel high-zinc chelating activity zinc chelating peptide which can be used as a good intermediate of a fourth-generation zinc supplement agent and provides an ideal carrier for further developing a fourth-generation zinc supplement product with high absorption rate and high biological utilization rate.

Description

High-zinc-chelation-activity zinc chelating peptide containing Ser-Cys and application thereof

The application is divisional application with application number 201710521185.4,application date 2017, 6 and 29 and invention name "high-zinc chelating activity zinc chelating peptide and application thereof".

Technical Field

The invention relates to the technical field of synthetic peptides, in particular to a high-zinc chelating activity zinc chelating peptide containing Ser-Cys and application thereof.

Background

Zinc (Zn) is one of the essential trace elements of human body, and has been proved by research that it is an essential component of nearly 2000 transcription factors in the body, is related to the activity of more than 300 metabolic enzymes, affects the immune system and redox balance of the body, and can be used as antioxidant factor and anti-inflammatory factor in the pathological states of chronic vascular disease, cancer, neurodegenerative disease, immune disorder and senility.

Zinc Chelating Peptide (ZCP) is one of trace metal ion chelating peptides, which is ligand of zinc ion in fourth generation microelement supplement and has Zn²⁺Ion chelating activity, usually resulting from proteolysis. ZCP can react with Zn²⁺Chelating, and can be used for supplementing zinc deficiency.

The existing zinc chelating peptide sequences are mostly separated from natural proteins, such as wheat germs, casein, hazelnuts, thamnaconus modestus fish skins, shrimp meat leftovers, urechis unicinctus and rapeseed.

The journal papers that have been published are as follows: preparing, purifying and structurally analyzing yellow crystal and the like (yellow crystal, Xining, Libo. rapeseed-derived zinc chelating peptide [ J ]. Chinese food and oil science, 2016, 31 (6): 68-73) hydrolyzing rapeseed protein by adopting alkaline protease, and obtaining four zinc chelating peptides, namely Ala-Arg (AR), Asn-Ser-Met (NSM), Gly-Lys-Arg (GKR) and Glu-Pro-Ser-His (EPSH), through biochemical separation and structural identification; separation, purification, characterization and biological activity research [ J ]. south Jiangnan university 2014) of zinc chelated peptide derived from wheat germ protein obtain two peptide sequences: Asn-Ala-Pro-Leu-Pro-Pro-Pro-Leu-Lys-His (1084Da), His-Asn-Ala-Pro-Asn-Pro-Gly-Leu-Pro-Try-Ala-Ala (1221 Da); leather et al (isolation and structural Properties characterization of Casein phosphopeptide Zinc chelate peptides, China's network, website http:// www.cnki.net/kcms/detail/11.1802.TS.20170517.1315.038.html) obtained is a mixture of Casein phosphopeptide CCPs after isolation; zhang Yaru (preparation, separation and purification and property research of hazelnut chelating peptide, China's web, doctor's paper, website http:// cdmd.cnki.com.cn/Article/CDMD-10157-1016143419.htm) obtains the hazelnut chelating peptide through separation and purification, but structural sequence identification is not carried out.

Therefore, the research and development of the zinc chelating peptide with higher zinc chelating activity has very important significance, and an ideal carrier can be provided for further developing a fourth-generation zinc supplement product with high absorption rate and high biological utilization rate.

Disclosure of Invention

In view of the problems in the prior art, the present invention aims to provide a zinc chelating peptide with high zinc chelating activity, wherein the zinc chelating peptide is tripeptide, tetrapeptide, pentapeptide or hexapeptide containing Cys.

Preferably, the zinc chelating peptide is a tripeptide or tetrapeptide containing Cys.

Preferably, the zinc chelating peptide is a Cys-containing tripeptide.

Preferably, the zinc chelating peptide is a tripeptide, tetrapeptide, pentapeptide or hexapeptide containing both Cys and Ser.

Preferably, the zinc chelating peptide is a tripeptide containing both Cys and Ser.

Preferably, the amino acid sequence of the zinc chelating peptide comprises one or more of Ala-Cys-His (ACH), His-Ala-Cys-His (HACH), Glu-Ala-Cys-His (EACH), Asp-Ala-Cys-His (DACH), Ala-Ser-Cys (ASC), Cys-Ser-Cys (CSC), Cys-Ser-Ala (CSA), Ser-Ala-Cys (SAC), Cys-His-Ser (CHS), His-Cys-Ser (HCS), Ser-Cys-His (SCH), Ser-His-Cys (SHC).

Preferably, the amino acid sequence of the zinc chelating peptide comprises one or more of Ala-Ser-Cys (ASC), Cys-Ser-Cys (CSC), Cys-Ser-Ala (CSA), Ser-Ala-Cys (SAC), Cys-His-Ser (CHS), His-Cys-Ser (HCS), Ser-Cys-His (SCH), Ser-His-Cys (SHC).

Preferably, the amino acid sequence of the zinc chelating peptide comprises one or more of Ser-Cys-His (SCH), Ala-Ser-Cys (ASC), Cys-Ser-Cys (CSC), Ser-His-Cys (SHC).

Preferably, the zinc chelating peptide is synthesized by a solid phase synthesis method.

The invention also aims to provide the application of the high-zinc-chelating-activity zinc chelating peptide in preparing a zinc supplement agent intermediate.

Based on the theoretical basis of polypeptide and metal ion chelation, through continuous design, screening and a large number of detection tests, the applicant discovers that when 2-6 peptides contain Cys (C), the zinc chelation activity is high, and the activity is not influenced by Cys (C) in a peptide sequence, particularly, tripeptides (preferably ASC, CSC, CSA, SAC, CHS, HCS, SCH and SHC) containing Cys (C) or Cys (C) and Ser (S) have excellent zinc chelation activity, so that the limitation that the existing zinc chelating peptide is low in bioabsorption and utilization rate is broken through, the peptide can be used as a good intermediate of a fourth-generation zinc supplement agent, and an ideal carrier is provided for further developing a fourth-generation zinc supplement product with high absorption rate and high biological utilization rate.

Drawings

FIG. 1 is a mass spectrum of Ala-Cys-His (ACH) zinc chelating peptide;

FIG. 2 is a high performance liquid chromatogram of Ala-Cys-His (ACH) zinc chelating peptide;

FIG. 3 is a mass spectrum of His-Ala-Cys-His (HACH) zinc chelating peptide;

FIG. 4 is a high performance liquid chromatogram of His-Ala-Cys-His (HACH) zinc chelating peptide;

FIG. 5 is a mass spectrum of Glu-Ala-Cys-His (EACH) zinc chelating peptide;

FIG. 6 is a high performance liquid chromatogram of Glu-Ala-Cys-His (EACH) zinc chelating peptide;

FIG. 7 is a mass spectrum of Asp-Ala-Cys-His (DACH) zinc chelating peptide;

FIG. 8 is a high performance liquid chromatogram of Asp-Ala-Cys-His (DACH) zinc chelating peptide;

FIG. 9 is a mass spectrum of Ala-Ser-Cys (ASC) zinc chelating peptide;

FIG. 10 is a high performance liquid chromatogram of Ala-Ser-Cys (ASC) zinc chelating peptide;

FIG. 11 is a Cys-Ser-Cys (CSC) zinc chelating peptide mass spectrum;

FIG. 12 is a high performance liquid chromatogram of Cys-Ser-Cys (CSC) zinc chelating peptide;

FIG. 13 is a Cys-Ser-Ala (CSA) zinc chelating peptide mass spectrum;

FIG. 14 is a Cys-Ser-Ala (CSA) Zinc chelating peptide HPLC chromatogram;

FIG. 15 is a Ser-Ala-Cys (SAC) zinc chelating peptide mass spectrum;

FIG. 16 is a high performance liquid chromatogram of Ser-Ala-Cys (SAC) zinc chelating peptide;

FIG. 17 is a Cys-His-Ser (CHS) zinc chelating peptide mass spectrum;

FIG. 18 is a Cys-His-Ser (CHS) zinc chelating peptide high performance liquid chromatogram;

FIG. 19 is a His-Cys-Ser (HCS) zinc chelating peptide mass spectrum;

FIG. 20 is a high performance liquid chromatogram of His-Cys-Ser (HCS) zinc chelating peptide;

FIG. 21 is a Ser-Cys-His (SCH) zinc chelating peptide mass spectrum;

FIG. 22 is a high performance liquid chromatogram of Ser-Cys-His (SCH) zinc chelating peptide;

FIG. 23 is a Ser-His-Cys (SHC) Zinc chelating peptide mass spectrum;

FIG. 24 is a high performance liquid chromatogram of Ser-His-Cys (SHC) zinc chelating peptide.

Detailed Description

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited thereto.

EXAMPLE 1 chemical Synthesis of Zinc chelating peptides

12 chemically synthesized peptides were obtained by chemical synthesis, namely: Ala-Cys-His (ACH), His-Ala-Cys-His (HACH), Glu-Ala-Cys-His (EACH), Asp-Ala-Cys-His (DACH), Ala-Ser-Cys (ASC), Cys-Ser-Cys (CSC), Cys-Ser-Ala (CSA), Ser-Ala-Cys (SAC), Cys-His-Ser (CHS), His-Cys-Ser (HCS), Ser-Cys-His (SCH), Ser-His-Cys (SHC).

The preparation process of the polypeptide is as follows: the polypeptide is prepared by adopting an Apex396 type polypeptide synthesizer and is synthesized by an Fmoc solid phase synthesis method. The amino acids are connected in sequence from the C end to the N end according to the characteristics of different peptide sequences. Firstly, connecting a first amino acid to an insoluble support resin through a section of acid-sensitive linker, removing an Fmoc protecting group by using piperidine, and then connecting a second Fmoc protected amino acid by using a preactivation method or a one-pot method; after the target sequence was attached, the peptide chain was eluted from the resin with TFA to give the crude product.

The synthesized polypeptide is purified by a high performance liquid chromatograph, the purity of the synthesized polypeptide reaches more than 90 percent, and the structure of the synthesized polypeptide is identified by a mass spectrometer.

Example 2 Activity assay of chemically synthesized peptides

Dissolving the synthetic peptide with deionized water to obtain 40mg/mL solution, adding 50uL synthetic peptide solution into 96-well plate, and adding 50uL ZnCl solution with concentration of 0.5mg/mL₂Reacting the solution at 37 ℃ for 3 h; deionized water was used as a blank control, and reduced glutathione was used as a positive control.

After the chelation reaction is finished, firstly adding 140uL of borate buffer solution (pH8.8-9.0) into micropores of a 96-well plate, then adding 60uL of zinc reagent, standing for 10min, detecting absorbance at 630nm by using an enzyme-labeling instrument, and calculating the chelation rate according to the following formula:

zinc (II) chelation rate (%) (C sample-C blank)/(total-C blank) × 100

Wherein, the sample C, blank C and total C are the zinc contents of the peptide-zinc (II) chelate, rapeseed protein hydrolysate, ZnCl2 and rapeseed protein hydrolysate mixed solution, respectively, and the final activity value is a relative value with respect to the positive control. The positive control value was 1.

The results of the activity assay for 22 chemically synthesized peptides are shown in Table 1.

Table 122 bars of chemically synthesized peptides and results of detection of their zinc chelation activity

As can be seen from Table 1, the 22 chemically synthesized peptides are roughly divided into two types according to the amino acid types, the first type of peptides do not comprise Cys (C), the second type of peptides comprise Cys (C), and the zinc chelating activity of the synthesized peptides containing Cys (C) is far higher than that of the synthesized peptides not comprising Cys (C), the activity is not influenced by the position of Cys (C) in the sequences, and the synthesized peptides have high zinc chelating activity; furthermore, in the synthetic peptide containing Cys (C), tripeptide containing Cys (C) and Ser (S) has more excellent zinc chelating activity; among them, Ser-Cys-His (SCH) has the highest zinc chelating activity.

Example 3 Mass Spectrometry and high Performance liquid chromatography analysis of synthetic peptides

Measuring 12 synthetic peptides by a Voyager-DEPRO type mass spectrometer to obtain a mass spectrogram, wherein mass spectrum parameters are as follows: a positive electrode mode, manual centralized control; the accelerating voltage is 20000V; the collection mass range is 300-2000Da, the number of laser projections is 50/frequency spectrum, the laser intensity is 2753, and the laser frequency is 3.0 HZ. The chromatographic conditions of the high performance liquid chromatography are as follows: the analytical column is Agela (250X 4.6mmI.D.) C18; the detection wavelength is 220 nm; gradient of 30-45% for 15 min; mobile phase a was 0.05% TFA + 2% CH₃CN, mobile phase B0.05% TFA + 90% CH₃CN。

The mass spectrograms of the 12 zinc chelating peptides are shown in figure 1, figure 3, figure 5, figure 7, figure 9, figure 11, figure 13, figure 15, figure 17, figure 19, figure 21 and figure 23, and the high performance liquid chromatograms are shown in figure 2, figure 4, figure 6, figure 8, figure 10, figure 12, figure 14, figure 16, figure 18, figure 20, figure 22 and figure 24.

As shown, the single peak retention time (min) of liquid chromatography for ACH, HACH, EACH, DACH, ASC, CSC, CSA, SAC, CHS, HCS, SCH, SHC is: 10.085, 7.001, 4.283, 4.140, 5.464, 5.464, 6.910, 8.569, 6.004, 8.965, 10.780, 9.582; the peak areas are respectively 98.87%, 98.92%, 99.54%, 99.31%, 99.12%, 99.14%, 96.14%, 98.35%, 95.27%, 98.64%, 99.63% and 98.32%; the primary mass spectrograms M/Z of ACH, HACH, EACH, DACH, ASC, CSC, CSA, SAC, CHS, HCS, SCH, SHC are fig. 1(329.12+1), fig. 3(466.17+1), fig. 5(458.16+1), fig. 7(444.14+1), fig. 9(279.0889+1), fig. 11(311.0610+1), fig. 13(279.0889+1), fig. 15(279.0889+1), fig. 17(345.1107+1), fig. 19(345.1107-1), fig. 21(345.1107+1), fig. 23(345.1107-1), respectively. The results show that the synthetic peptide has accurate structure and high purity.

In conclusion, the zinc chelating peptide disclosed by the invention has excellent zinc chelating activity, breaks through the limitation of low bioabsorption and utilization rate of the existing zinc chelating peptide, and suggests that the peptide can be used as a good intermediate of a fourth-generation zinc supplement agent, so that an ideal carrier is provided for further developing a fourth-generation zinc supplement product with high absorption rate and high biological utilization rate.

It should be understood that the detailed description of the invention is merely illustrative of the invention and is not intended to limit the invention to the specific embodiments described. It will be appreciated by those skilled in the art that the present invention may be modified or substituted equally as well to achieve the same technical result; as long as the use requirements are met, the method is within the protection scope of the invention.

Claims

1. The high-zinc-chelation-activity zinc-chelation peptide containing Ser-Cys is characterized in that the high-zinc-chelation-activity zinc-chelation peptide containing Ser-Cys is tripeptide containing Ser-Cys.

2. The high zinc chelating activity zinc chelating peptide containing Ser-Cys as claimed in claim 1, wherein the amino acid sequence of the high zinc chelating activity zinc chelating peptide containing Ser-Cys comprises: one or more of Ala-Ser-Cys and Cys-Ser-Cys.

3. The high zinc chelating activity zinc chelating peptide containing Ser-Cys as claimed in claim 1, wherein the high zinc chelating activity zinc chelating peptide containing Ser-Cys is synthesized by solid phase synthesis.

4. Use of the high zinc chelating activity zinc chelating peptide containing Ser-Cys according to any one of claims 1 to 3 in the preparation of an intermediate of a zinc supplementing agent.