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bioRxiv · 10.1101/315713

Discovery of a human testis-specific protein complex TEX101-DPEP3 and selection of its disrupting antibodies

Schiza, C.·Korbakis, D.·Panteleli, E.·Jarvi, K.·Drabovich, A. P.·Diamandis, E. P.
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Abstract

TEX101 is a testis-specific protein expressed exclusively in male germ cells and is a validated biomarker of male infertility. Studies in mice suggest that TEX101 is a cell-surface chaperone which regulates, through protein-protein interactions, the maturation of proteins involved in spermatozoa transit and oocyte binding. Male TEX101-null mice are sterile. Here, we identified by co-immunoprecipitation-mass spectrometry the interactome of human TEX101 in testicular tissues and spermatozoa. The testis-specific cell-surface dipeptidase 3 (DPEP3) emerged as the top hit. We further validated the TEX101-DPEP3 complex by using hybrid immunoassays. Combinations of antibodies recognizing different epitopes of TEX101 and DPEP3 facilitated development of a simple immunoassay to screen for disruptors of TEX101-DPEP3 complex. As a proof-of-a-concept, we demonstrated that anti-TEX101 antibody T4 disrupted the native TEX101-DPEP3 complex. Disrupting antibodies may be used to study the human TEX101-DPEP3 complex, and to develop modulators for male fertility.\n\nNon-standard abbreviations

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Schiza, C., Korbakis, D., Panteleli, E., Jarvi, K., Drabovich, A. P., Diamandis, E. P.. 2018-05-07. Discovery of a human testis-specific protein complex TEX101-DPEP3 and selection of its disrupting antibodies. https://doi.org/10.1101/315713

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