NDLI: Binding of Procollagen C-Proteinase Enhancer-1 (PCPE-1) to Heparin/Heparan Sulfate

Content Provider	PubMed Central
Author	Weiss, Tali Ricard-blum, Sylvie Laura, Moschcovich Wineman, Eitan Shlomit, Mesilaty Kessler, Efrat
Abstract	Procollagen C-proteinase enhancer-1 (PCPE-1) is an extracellular matrix (ECM) glycoprotein that can stimulate procollagen processing by procollagen C-proteinases (PCPs) such as bone morphogenetic protein-1 (BMP-1). The PCPs can process additional extracellular protein precursors and play fundamental roles in developmental processes and assembly of the ECM. The stimulatory activity of PCPE-1 is restricted to the processing of fibrillar procollagens, suggesting PCPE-1 is a specific regulator of collagen deposition. PCPE-1 consists of two CUB domains that bind to the procollagen C-propeptides and are required for PCP enhancing activity, and one NTR domain that binds heparin. To understand the biological role of the NTR domain, we performed surface plasmon resonance (SPR) binding assays, cell attachment assays as well as immunofluorescence and activity assays, all indicating that the NTR domain can mediate PCPE-1 binding to cell surface heparan sulfate proteoglycans (HSPGs). The SPR data revealed binding affinities to heparin/HSPGs in the high nanomolar range and dependence on calcium. Both 3T3 mouse fibroblasts and human embryonic kidney cells (HEK-293) attached to PCPE-1, an interaction that was inhibited by heparin. Cell attachment was also inhibited by an NTR-specific antibody and the NTR fragment. Immunofluorescence analysis revealed that PCPE-Flag binds to mouse fibroblasts and heparin competes for this binding. Cell-associated PCPE-Flag stimulated procollagen processing by BMP-1 several fold. Our data suggest that through interaction with cell surface HSPGs, the NTR domain can anchor PCPE-1 to the cell membrane, permitting pericellular enhancement of PCP activity. This points to the cell surface as a physiological site of PCPE-1 action.
Related Links	http://dx.doi.org/10.1074/jbc.m110.141366
Ending Page	33874
Page Count	8
Starting Page	33867
File Format	PDF
ISSN	00219258
e-ISSN	1083351X
Journal	The Journal of Biological Chemistry
Issue Number	44
Volume Number	285
Language	English
Publisher	American Society for Biochemistry and Molecular Biology
Publisher Date	2010-10-29
Access Restriction	Open
Rights Holder	American Society for Biochemistry and Molecular Biology
Subject Keyword	Cell Biology Biochemistry Molecular Biology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry Molecular Biology

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