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. 2006 May;12(5):428-31, 434.

[Correlation of epididymal protease inhibitor Eppin and Semenogelin on human ejaculated spermatozoa]

[Article in Chinese]
Zeng-Jun Wang  1 , Hong-Fei Wu, Li-Xin Qian, Di Qiao, Jian-Feng Shao, Wei Zhang, Yuan-Geng Sui, Zheng-Quan Xu
Affiliations
  • PMID: 16755874

[Correlation of epididymal protease inhibitor Eppin and Semenogelin on human ejaculated spermatozoa]

[Article in Chinese]
Zeng-Jun Wang et al. Zhonghua Nan Ke Xue. 2006 May.

Abstract

Objective: To evaluate the correlation of epididymal protease inhibitor(Eppin) and Semenogelin(Sg) on human ejaculated spermatozoa.

Methods: The experimental approaches include: (1) Immunoprecipitation of Eppin with anti-Eppin from semen; (2) Colocalization of Eppin and Sg by immunofluorescence; (3) Immunoprecipitation of rEppin and rSg;(4) Far-Western blotting of rEppin and rSg;(5) Competition of saturated 125I-rSg binding to rEppin with unlabeled Sg, and direct binding of 125I-rSg to rEppin on a blot; (6) Autoradiography of 125I-rSg with rEppin.

Results: Eppin-Sg complex present on the surface of human ejaculated spermatozoa, Cys-239 is the only cystein for rEppin binding rSg. Reduction and carboxymethylation of Cys-239 blocks binding of 125I-rEppin to rSg.

Conclusion: Our study demonstrates that Eppin and Sg bind to each other on human ejaculated spermatozoa. A disulfide linkage occurs between Sg and Eppin, indicating the specificity of binding.

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