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Vol. 15, Issue 11, 5012-5020, November 2004
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* Department of Biochemistry and Molecular Biology, Oregon Health and Science University, School of Medicine, Portland, OR 97239-3098;
Vollum Institute, Oregon Health and Science University, School of Medicine, Portland, OR 97239-3098; and
Department of Cell and Developmental Biology, Oregon Health and Science University, School of Medicine, Portland, OR 97239-3098
Submitted August 6, 2004;
Revised August 27, 2004;
Accepted August 30, 2004
Monitoring Editor: Carl-Henrik Heldin
Pro bone morphogenetic protein-4 (BMP-4) is initially cleaved at a consensus furin motif adjacent to the mature ligand domain (the S1 site), and this allows for subsequent cleavage at an upstream motif (the S2 site). Previous studies have shown that S2 cleavage regulates the activity and signaling range of mature BMP-4, but the mechanism by which this occurs is unknown. Here, we show that the pro- and mature domains of BMP-4 remain noncovalently associated after S1 cleavage, generating a complex that is targeted for rapid degradation. Degradation requires lysosomal and proteosomal function and is enhanced by interaction with heparin sulfate proteoglycans. Subsequent cleavage at the S2 site liberates mature BMP-4 from the prodomain, thereby stabilizing the protein. We also show that cleavage at the S2, but not the S1 site, is enhanced at reduced pH, consistent with the possibility that the two cleavages occur in distinct subcellular compartments. Based on these results, we propose a model for how cleavage at the upstream site regulates the activity and signaling range of mature BMP-4 after it has been released from the prodomain.
Present address: Department of Microbiology and Immunology, University of British Columbia, #300-6174 University Blvd., Vancouver, British Columbia, Canada V6T 1Z3.
|| Corresponding author. E-mail address: christia{at}ohsu.edu.
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