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Human epididymis expression sperm binding protein HEL-72, encoding gene and application thereof

A HEL-72, protein-binding technology, applied in the fields of biotechnology and medicine, can solve the problem of little known protein function, and achieve the effect of less side effects

Inactive Publication Date: 2010-06-09
李建远
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are about 200 secreted proteins in the epididymis that interact with sperm and participate in sperm maturation, but little is known about the functions of these proteins

Method used

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  • Human epididymis expression sperm binding protein HEL-72, encoding gene and application thereof
  • Human epididymis expression sperm binding protein HEL-72, encoding gene and application thereof
  • Human epididymis expression sperm binding protein HEL-72, encoding gene and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1. Preparation of Human Epididymis Expressed Protein HEL-72 Using Genetic Engineering Technology

[0040] Gene cloning and sequence analysis

[0041] Large-scale sequencing and screening of the human epididymis cDNA library constructed in our laboratory was performed to obtain expressed sequence tags (EST), and electronic cloning was performed using the Unigene database to obtain the full-length cDNA of human HEL-72. Using Expasy Translate tool (http: / / us.expasy.orghttp: / / us.expasy.org), InterProScan (http: / / www.ebi.ac.uk / Tools / http: / / www.ebi.ac. uk / Tools / ) and Protein roteinblast (http: / / www.ncbi.nlm.nih.gov / BLAST / http: / / www.ncbi.nlm.nih.gov / BLAST / ) etc. to predict the peptide sequence of HEL-72 and assumed functions. SignalP (http: / / www.cbs.dtu.dkhttp: / / www.cbs.dtu.dk), PSORTII and WoLFPSORT (http: / / psort.nibb.ac.jp) and other software analyzes and predicts the signal peptide of the protein and intracellular localization. ProfileScan (http: / / myhits.isb-sib...

Embodiment 2

[0045] Example 2. Preparation of anti-HEL-72 polyclonal antiserum

[0046] Polyclonal antibodies were prepared by immunizing BALB / C mice with recombinant HEL-72 protein. Briefly, each mouse was injected with 50 μg of recombinant protein and the same amount of complete Freund's adjuvant (CFA) on day 1. Then on the 15th, 30th and 45th days, 25 μg of recombinant protein and the same amount of incomplete Freund's adjuvant (IFA) were injected to boost the immunization. On the 60th day, blood was collected from the eyeball, and the serum was separated to analyze the titer and specificity of the antibody by ELASA and western blot. ELISA analysis showed that the antibody titer reached 1:10000. Western blot showed good specificity for both recombinant protein and native HEL-72 extracted from human epididymis fluid.

Embodiment 3

[0047] Example 3. Study on Human HEL-72mRNA Tissue Expression Profile

[0048] In order to determine the expression pattern of HEL-72, semi-quantitative RT-PCR was used to analyze the expression difference of HEL-72 gene in human epididymis head, body, tail, testis, heart, liver, spleen, lung, kidney, stomach and other tissues. Use TRIzol (Tiangen, Beijing, China) to extract total RNA, 1ug ​​total RNA uses 20UAMV reverse transcriptase (Promega) and 0.3ugoligod T 18 (Promega) was reverse transcribed into cDNA. Then, 2ul of the synthesized cDNA was amplified by PCR using gene-specific primers. 20ul reaction system contains: 2ul10×PCR buffer (with MgCl 2 ), 2ul dNTP Mix (10mmol / L), 1ul each primer ul (25umol / L), 1ul TaqDNA polymerase (2.5U / ul), 2ulcDNA template and 11ulddH 2 O. The program of PCR reaction was: 94°C, 10min; 94°C, 1min; 54°C (for HEL-72) / 49°C (β-actin) for 30s; 72°C, 1min (35 cycles); 72°C extension for 7min. The expression of β-actin was used as an internal r...

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Abstract

The invention belongs to the field of biotechnology and medicine, and discloses a new human epididymis specific expression sperm binding protein HEL-72 as well as preparation and application thereof. The invention discloses an amino acid sequence of the HEL-72 protein and provides a recombination expression carrier carrying the DNA sequence for encoding the protein. The protein is located in the primary segment and tail segment at the tail part of a mature sperm. A RT-PCR result shows that the gene is lowly expressed in the epididymis, highly expressed in the tissues of testis, kidney and stomach, and is negative in the heart and liver. A band of about 30 KD is detected in the corpus epididymidis part with Western blot. The HEL-72 protein can be used as a target protein for researching and developing immunity contraceptive as well as clinical diagnosis and treatment for male sterility. A method for detecting a corresponding gene or protein based on development of the HEL-72 protein can be widely used for the research field of reproductive medicine.

Description

technical field [0001] The invention belongs to the field of biotechnology and medicine. Specifically, the present invention relates to a new human epididymis expressing sperm-binding protein HEL-72 and its coding gene and application Background technique [0002] The development of human beings in this century is facing two serious problems: on the one hand, the global population is rapidly expanding and is expected to reach 9 billion in 2050; on the other hand, according to the World Health Organization survey, about 15% of couples are infertile The problem is that the incidence of infertility in developed countries has soared in the past 10 years, and it can be as high as 30% in developed countries in Europe, of which male factors account for about half. The World Health Organization predicts that with the increase of environmental pollution and sexually transmitted diseases and other pathogenic factors, infertility will become the third major disease after tumors and ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07K14/47C12N15/12C12N15/63C12N5/10C07K16/18A61K38/17A61K31/7088A61K48/00G01N33/68C12Q1/68A61P15/16A61P31/00A61P35/00
Inventor 李建远
Owner 李建远
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