Biotechnology Bulletin ›› 2021, Vol. 37 ›› Issue (3): 261-270.doi: 10.13560/j.cnki.biotech.bull.1985.2020-0724

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Preparation and Multi-purpose Validation of Sperm-specific Protein Cabs1 Polyclonal Antibody

PENG Li-zhong1(), ZHANG Peng2, ZHOU Wen-wen1, ZENG Xu-hui1, ZHANG Xiao-ning1,2()   

  1. 1. Medical School,Institute of Reproductive Medicine,Nantong University,Nantong 226019
    2. Institute of Life Science,Nanchang University,Nanchang 330031
  • Received:2020-06-11 Online:2021-03-26 Published:2021-04-02
  • Contact: ZHANG Xiao-ning E-mail:1429895286@qq.com;zhangxn@ntu.edu.cn

Abstract:

This study aims to prepare anti-mouse Cabs1(calcium-binding and spermatid-specific protein 1)polyclonal antibody contributing to further analyze the Cabs1 functions in the regulation of spermiogenesis and sperm function in mice. The mouse Cabs1 gene coding sequence was optimized based on the codon degeneracy and usage bias. Next,the recombinant expression vector ET-30a(+)/Cabs1 was constructed to express recombinant protein. The recombinant protein was subcutaneously immunized New Zealand white rabbit to produce serum,and the Cabs1 polyclonal antibody was obtained by affinity and purification. Western blot and immunofluorescence experiments verified the application value of antibodies. As results,polyclonal antibodies with high titer and specificity for Cabs1 were obtained,and the results by Western blot and immunofluorescence experiments revealed that Cabs1 protein of the mouse began to be expressed in elongating spermatid and mainly located in the acrosome and the flagellar principal piece. This antibody also could be used to immunological recognition for human Cabs1. In addition,our Cabs1 antibody also recognized naturally un-denatured Cabs1 protein,suggesting that this antibody could be employed to identify and study the interaction complexes of Cabs1. In conclusion,the prepared antibody solves the problem that the commercial Cabs1 antibodies cannot recognize the mouse Cabs1 protein.

Key words: spermiogenesis, sperm function, Cabs1, prokaryotic expression, polyclonal antibody