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Anti-SERINC5 antibody and application thereof

An antibody and monoclonal antibody technology, applied in the field of molecular biology, can solve problems such as lack of and hinder research progress, and achieve the effect of accelerating research progress

Active Publication Date: 2018-12-04
THE THIRD PEOPLES HOSPITAL OF SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lack of SERINC5-specific monoclonal antibodies, especially those that can be used for flow cytometry detection, has hindered the progress of researchers in revealing the antiviral function of SERINC5.

Method used

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  • Anti-SERINC5 antibody and application thereof
  • Anti-SERINC5 antibody and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1 Screening of the polypeptide immunogen of SERINC5

[0049] SERINC5 (GENBANK ACCESSION: NM_001174072) is a nine-transmembrane protein, and it is not yet possible to prepare a purified protein. Therefore, the strategy of preparing monoclonal antibodies is to immunize mice with peptides.

[0050] The extracellular region of SERINC5 includes the amino terminal and 4 extracellular loops, of which the amino terminal contains 35 amino acids; the first extracellular loop contains 14 amino acid residues and contains 1 glycosylation site; the second extracellular loop The loop contains 21 amino acid residues and contains 1 glycosylation site; the third extracellular loop contains only 7 amino acids; the fourth extracellular loop consists of 53 amino acid residues and has no glycosylation site . The amino terminal and the fourth extracellular loop region of SERINC5 contain more amino acid residues and no glycosylation sites, making it easier to screen out suitable polyp...

Embodiment 2

[0054] Embodiment 2 Preparation of anti-human SERINC5 monoclonal antibody

[0055] 1. Immunization of animals

[0056] The KLH-coupled polypeptide (SEQ ID NO:9) was dissolved in distilled water to prepare a concentration of 1 mg / ml as an immunogen, and 100 μl of the immunogen and complete Freund's adjuvant (Sigma-Aldrich) were mixed and shaken to form a water-in-oil emulsion . For the first immunization, 6-8 week-old BALB / c mice were subcutaneously injected with 200 μl of immunogen / adjuvant mixture. After the initial immunization, a half-dose booster immunization was carried out at the 3rd week and 6th week respectively, and blood was collected at the 8th week, and the antibody titer was analyzed by ELISA.

[0057] 2. Cell Fusion

[0058] Two weeks after the last booster immunization, the mice were sacrificed, spleen cells were taken, mixed with SP2 / 0 cells (purchased from ATCC, product number: CRL-1581) at a ratio of 10:1, centrifuged and washed with PEG1450 (Sigma -Aldri...

Embodiment 3

[0061] Example 3 Detection of cell surface SERINC5 by flow cytometry

[0062] Take 100 μl of the culture supernatant of the hybridoma cells 4D4.6, 4D4.8, 4D4.11, and 5H4.1 screened in Example 2, and mix with 1×10 6 A 293T cell and 293T-SERINC5 cell (293T cell line stably expressing human SERINC5) (the above two cell lines were preserved by the Institute of Liver Diseases, Shenzhen Third People's Hospital) were incubated at room temperature for 10 minutes, washed with PBS and centrifuged. 0.2 μl of fluorescent secondary antibody AF647-Anti mouse IgG (H+L) (Invitrogen, Cat. No. A-21237), incubated at room temperature in the dark for 10 minutes, washed with PBS, and flow cytometry to detect the fluorescent signal on the cell surface. It was found that 4D4.6, 4D4.8, and 4D4.11 can recognize SERINC5 molecules on the cell surface, while 5H4.1 can only recognize polypeptides, but not SERINC5 molecules on the cell surface ( Figure 4 , the gray peak in the figure is the result of the...

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Abstract

The invention relates to an anti-SERINC5 antibody and application thereof. Specifically, the invention provides an anti-SERINC5 antibody and functional fragment, a nucleotide, a carrier, a monoclonalantibody, a kit and application thereof in detection of SERINC5 protein or polypeptide sequence shown as SEQIDNO:9. At the same time, the invention also provides a preparation method of the monoclonalantibody and a preparation method of a monoclonal antibody hybridoma cell line. The antibody and functional fragment prepared by the method provided by the invention can be effectively used for reaction with SERINC5 protein, like flow cytometry detection of SERINC5 molecules on cell surfaces and SERINC5 expressed in combination with cells, study of virus amplification mechanism, etc., thus providing an effective research tool for studying the antiviral mechanism of SERINC5, being conducive to accelerating the research progress in the field, and providing a new idea for further development ofnovel HIV protein Nef targeted AIDS drugs.

Description

technical field [0001] The invention relates to the field of molecular biology, in particular to an anti-SERINC5 antibody and application thereof. Background technique [0002] Serine integration factor (SERINC) is a membrane protein with 5 members in its family. Among them, SERINC5 is the latest natural immune molecule against HIV, which can block the virus from infecting new cells, thereby significantly reducing human immunodeficiency virus. (HIV) infectivity. SERINC5 protein has a great influence on virus infectivity and can reduce the infectivity of HIV virions by more than 100 times. HIV encodes a regulatory protein Nef to resist SERINC5. The ability of HIV to inhibit the SERINC protein has a profound effect on the cells it infects. Disrupting this mechanism of inhibition of SERINC allows the SERINC5 protein to inactivate the virus, which is a very powerful strategy for the treatment of HIV and similar viruses that express the Nef protein. . [0003] In addition to ...

Claims

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Application Information

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IPC IPC(8): C07K16/18C12N15/13C12N15/85C12N5/20G01N33/68G01N33/577
CPCC07K16/18C12N15/02C12N15/85G01N33/577G01N33/68
Inventor 程林唐娴王辉陈志伟何云
Owner THE THIRD PEOPLES HOSPITAL OF SHENZHEN
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