Cell permeable peptide hPP3 and usage thereof

A technology of penetrating peptides and cells, applied in the field of biomedicine, to achieve the effect of small possibility, few unsafe factors and broad application prospects

Active Publication Date: 2013-09-18
深圳真实生物医药科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It has also been reported that application of TAT drug-c...

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  • Cell permeable peptide hPP3 and usage thereof
  • Cell permeable peptide hPP3 and usage thereof
  • Cell permeable peptide hPP3 and usage thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1, CPP primary structure, secondary structure analysis, prediction and identification of new human-derived CPP:

[0033] 1. Analyze the secondary structure of the cell-penetrating peptide hPP3 obtained in the present invention, using the online analysis program of emboss (for the analysis program, please refer to the webpage: http: / / emboss.bioinformatics.nl / cgi-bin / emboss / pepwheel On-line analysis of the wheel structure of peptides; http: / / emboss.bioinformatics.nl / cgi-bin / emboss / help / garnier at Wire Analyze secondary structures (helices, folds, etc.). The schematic diagram of the wheel structure of hPP3, the schematic diagrams of the helical and folded structures are as follows image 3 and Figure 4 shown.

[0034] In order to facilitate the study of the cell transmembrane function of hPP3:

[0035] Chemically synthesized green fluorescently labeled hPP3:

[0036] Lys-Pro-Lys-Arg-Lys-Arg-Arg-Lys-Lys-Lys-Gly-His-Gly-Trp-Ser-Arg-FITC (hPP3-FITC);

[0037...

Embodiment 2

[0092] Example 2, hPP3 has little effect on cell viability

[0093] (1) Culture cells ECV-304 and HepG2 in the logarithmic growth phase at 1×10 4 The seeding density of each cell / well was inoculated in a 96-well plate for routine culture, 100 μl per well, and 3 replicate wells were set up for each cell, and cultured at 37°C;

[0094] (2) In the logarithmic growth phase, the culture medium was replaced with serum-free RPMI-1640 medium, and the culture was continued for 1 hour;

[0095] (3) Replace with serum-free RPMI-1640 culture medium with hPP3 concentration gradients of 10 μM, 20 μM, 30 μM, 40 μM and 50 μM, and continue to culture for 24 hours;

[0096] (4) After the incubation time is over, add 100 μl of PBS to each well to wash, 2 min×3 times;

[0097] (5) Add 80 μl serum-containing normal culture medium and 20 μl MTT (mother solution concentration 5 mg / ml, ie 0.5% MTT) solution to each well, continue to incubate at 37°C for 4 hours, and aspirate the culture medium af...

Embodiment 3

[0101] Example 3. Construction of pET15b-hPP3-GFP plasmid, expression and purification of fusion protein and research on its transmembrane efficacy

[0102] 3.1 Construction and identification of pET15b-hPP3-GFP recombinant plasmid

[0103] (1) Design two single-stranded cDNAs encoding hPP3, with Nde I and Xho I restriction sites on both sides, and submit them to Shanghai Shenggong Company to synthesize single-stranded oligonucleotide chains, and then combine the two single-stranded DNAs Add an equal amount into the aqueous solution, and cool naturally to room temperature at 95°C for 5 minutes to complete the annealing to form a complementary double-stranded DNA fragment (hPP3); at the same time, a pair of primers were designed using pEGFP (purchased from Clontech) as a template and obtained by PCR GFP protein gene fragment, with Xho I and BamH I restriction sites on both sides, purified PCR product for future use;

[0104] (2) Perform double digestion with BamH I / Nde I res...

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Abstract

The invention belongs to the field of biomedicine and relates to a human original cell permeable peptide hPP3 and usage thereof. The cell permeable peptide hPP3 provided by the invention has a cell membrane permeation function, thereby being capable of carrying such large molecules as protein to enter a plurality kind of cells in a transmembrane manner; since the peptide segment is derived from human protein, the possibility of causing human body immune response is small, the potential insecurity factors are relatively small, so that the hPP3 can serve as a transmembrane transport carrier having brilliant development prospect of such bioactive molecules as protein, polypeptide, and the hPP3 can be used as an intracellular drug transport carrier.

Description

technical field [0001] The invention relates to the field of biomedicine, in particular to a cell-penetrating peptide and its application. Background technique [0002] With the completion of the Human Genome Project and the rise of proteomics, more and more biomolecules such as proteins, polypeptides, and nucleic acids are found to be likely to become therapeutic drugs. However, unlike traditional drugs, these therapeutic molecules have low stability in the body, and it is difficult for molecules that need to function in cells to enter cells, which limits their promotion and application as drugs. Therefore, it is an urgent problem to develop an economical and safe carrier system that can effectively carry these therapeutic biomacromolecules into target cells. [0003] In recent years, non-viral drug delivery vehicles have been placed with high hopes due to their safety, low toxicity, and low immune response. So far, the most commonly used methods for introducing biomacrom...

Claims

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Application Information

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IPC IPC(8): C07K7/08C07K19/00C12N15/63C12N5/10C12N1/15C12N1/19C12N1/21C12N7/01A61K47/42
Inventor 柳长柏邹黎黎杨英桂吴江锋马节兰
Owner 深圳真实生物医药科技有限公司
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