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Protein disulfide isomerase homolog PDILT is required for quality control of sperm membrane protein ADAM3 and male fertility

Tokuhiro, K.; Ikawa, M.; Benham, AM.; Okabe, M.

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Authors

K. Tokuhiro

M. Ikawa

M. Okabe



Abstract

A disintegrin and metalloproteinase 3 (ADAM3) is a sperm membrane protein critical for both sperm migration from the uterus into the oviduct and sperm primary binding to the zona pellucida (ZP). Here we show that the testis-specific protein disulfide isomerase homolog (PDILT) cooperates with the testis-specific calreticulin-like chaperone, calsperin (CALR3), in the endoplasmic reticulum and plays an indispensable role in the disulfide-bond formation and folding of ADAM3. Pdilt−/− mice were male infertile because ADAM3 could not be folded properly and transported to the sperm surface without the PDILT/CALR3 complex. Peculiarly we find that not only Pdilt−/−, but also Adam3−/−, spermatozoa effectively fertilize eggs when the eggs are surrounded in cumulus oophorus. These findings reveal that ADAM3 requires testis-specific private chaperones to be folded properly and that the principle role of ADAM3 is for sperm migration into the oviduct but not for the fertilization event. Moreover, the importance of primary sperm ZP binding, which has been thought to be a critical step in mammalian fertilization, should be reconsidered.

Citation

Tokuhiro, K., Ikawa, M., Benham, A., & Okabe, M. (2012). Protein disulfide isomerase homolog PDILT is required for quality control of sperm membrane protein ADAM3 and male fertility. Proceedings of the National Academy of Sciences, 109(10), 3850-3855. https://doi.org/10.1073/pnas.1117963109

Journal Article Type Article
Publication Date Mar 6, 2012
Deposit Date Mar 7, 2012
Publicly Available Date May 1, 2012
Journal Proceedings of the National Academy of Sciences
Print ISSN 0027-8424
Electronic ISSN 1091-6490
Publisher National Academy of Sciences
Peer Reviewed Peer Reviewed
Volume 109
Issue 10
Pages 3850-3855
DOI https://doi.org/10.1073/pnas.1117963109

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