A kind of peptide inhibitor, its preparation method and application
A technology of peptide inhibitors and inhibitors, applied in the field of biomedicine, can solve the problems of complicated preparation steps and difficult industrial production, and achieve the effect of reducing toxic effects
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experiment example 1
[0051] Preparation of Experimental Example 1 Peptide Inhibitor API 1
[0052] The peptide-like inhibitor API 1 of the present invention is synthesized by a solid-phase subunit synthesis method, the method comprising the following steps:
[0053] (1) Add 2M bromoacetic acid and 3.2M N,N'-diisopropylcarbodiimide (DIC) to Rink amide AM resin (substitution level 0.3mmol / g), react at 37°C for 30min, and the resin end Amino acylation;
[0054] (2) Add 2M primary amine and react at 37°C for 90 minutes, and replace the bromine atom by nucleophilic displacement reaction to complete the synthesis of a subunit;
[0055] (3) Steps (1) and (2) are repeated until the synthesis of the remaining subunits is completed;
[0056] (4) After the synthesis is completed, the side chain protecting group is removed, and API 1 is cracked from the resin with 95% trifluoroacetic acid, 2.5% ultrapure water, and 2.5% triisopropylsilane for future use.
[0057] The molecular formula of the prepared API 1...
experiment example 2
[0061] Experimental Example 2 Changes in the morphology of β-amyloid polypeptide Aβ1-42 aggregates by peptide inhibitor API 1
[0062] The β-amyloid polypeptide Aβ1-42 was dissolved in phosphate buffer and incubated with the peptoid inhibitor API 1 at constant temperature and shaking at 37°C for 48 hours, and the effect of API 1 on the aggregation morphology of Aβ1-42 was observed by atomic force microscopy. influences. The characterization of the influence of API1 on the aggregation morphology of Aβ1-42 comprises the following steps:
[0063] (1) Dissolving Aβ1-42 in phosphate buffer solution with pH 7.2 to make a 20 μM solution;
[0064] (2) API 1 and Aβ1-42 were mixed equimolarly, dissolved in phosphate buffer solution with pH 7.2 to prepare a mixed buffer solution, the concentrations were 200 μM and 20 μM respectively, and co-incubated at 37°C for 24 hours;
[0065] (3) Add the mixed solutions obtained in steps (1) and (2) dropwise onto flat substrates such as mica and s...
experiment example 3
[0067] Experimental Example 3 Aggregation Inhibitory Effect of Peptide Inhibitor API 1 on Aβ1-42 Polypeptide
[0068] The specific steps for detecting the aggregation inhibitory effect of the peptide inhibitor API 1 of the present invention on the Aβ1-42 polypeptide using ThT fluorescence technology are as follows:
[0069] (1) Prepare 20 μM Aβ1-42 solution, Aβ1-42:API 1=1:1, 1:5 and 1:10 mixed buffer;
[0070] (2) adding THT fluorescent dye to the solution configured in step (1);
[0071] (3) Test the mixed solutions obtained in step (2) respectively. Select a specific excitation wavelength and emission wavelength, and reflect the aggregation degree of Aβ1-42 in the solution by testing the fluorescence intensity at the emission wavelength.
[0072] The experimental condition is 37°C, and the test is performed every 15 minutes. The results are as follows: figure 2 As shown, API 1:Aβ1-42=1:1, 1:5, and 1:10 respectively gradually strengthened the aggregation inhibitory effect...
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