Abstract
The angiotensin-converting enzyme (ACE) is a key regulator of blood pressure. It is known to cleave small peptides, such as angiotensin I and bradykinin and changes their biological activities, leading to upregulation of blood pressure. Here we describe a new activity for ACE: a glycosylphosphatidylinositol (GPI)-anchored protein releasing activity (GPIase activity). Unlike its peptidase activity, GPIase activity is weakly inhibited by the tightly binding ACE inhibitor and not inactivated by substitutions of core amino acid residues for the peptidase activity, suggesting that the active site elements for GPIase differ from those for peptidase activity. ACE shed various GPI-anchored proteins from the cell surface, and the process was accelerated by the lipid raft disruptor filipin. The released products carried portions of the GPI anchor, indicating cleavage within the GPI moiety. Further analysis by high-performance liquid chromatography–mass spectrometry predicted the cleavage site at the mannose-mannose linkage. GPI-anchored proteins such as TESP5 and PH-20 were released from the sperm membrane of wild-type mice but not in Ace knockout sperm in vivo. Moreover, peptidase-inactivated E414D mutant ACE and also PI-PLC rescued the egg-binding deficiency of Ace knockout sperms, implying that ACE plays a crucial role in fertilization through this activity.
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Acknowledgements
We thank K. Ohishi and Y. Tashima for technical assistance, T. Baba for providing anti-TESP5 antibody and P. Primakoff for providing anti-PH-20 antibody. We are also grateful to V.W. Keng and D.G. Myles for the critical reading of the manuscript. This work was supported by grants from the Osaka Medical Research Foundation for Incurable Diseases and the Ministry of Education, Science, Sports, and Culture of Japan.
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Supplementary information
Supplementary Fig. 1 (download PDF )
Detection of GPIase activity in testicular germ cells. (PDF 56 kb)
Supplementary Fig. 2 (download PDF )
Lack of Gpi-pld expression in the mouse testicular germ cell. (PDF 104 kb)
Supplementary Fig. 3 (download PDF )
Proteomics analysis of the purified 100-kDa protein. (PDF 37 kb)
Supplementary Fig. 4 (download PDF )
The testicular isoform of wild-type (ACE-WT) and peptidase-inactivated mutants (ACE-E414D and ACE-H413K, H417K) were produced and purified as described in Methods. (PDF 48 kb)
Supplementary Fig. 5 (download PDF )
PLAP substrate produced and purified as described in Methods. (PDF 30 kb)
Supplementary Fig. 6 (download PDF )
ACE-S results in shedding of DAF from K562 cell surface. K562 cells were treated with filipin and then with 1.0 μM ACE-S as described in the Methods. (PDF 53 kb)
Supplementary Fig. 7 (download PDF )
Pups born from knockout sperm pretreated with wild-type Ace-t. (PDF 75 kb)
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Kondoh, G., Tojo, H., Nakatani, Y. et al. Angiotensin-converting enzyme is a GPI-anchored protein releasing factor crucial for fertilization. Nat Med 11, 160–166 (2005). https://doi.org/10.1038/nm1179
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DOI: https://doi.org/10.1038/nm1179
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