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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Pizzo, Salvatore V. Wang, Fang Ray, Rupa Gonzalez-gronow, Mario |
| Description | Author Affiliation: Gonzalez-Gronow M ( Department of Pathology, Duke University Medical Center, Durham, North Carolina 27710, USA. gonza002@mc.duke.edu) |
| Abstract | The voltage-dependent anion channel (VDAC), a major pore-forming protein in the outer membrane of mitochondria, is also found in the plasma membrane of a large number of cells where in addition to its role in regulating cellular ATP release and volume control it is important for maintaining redox homeostasis. Cell surface VDAC is a receptor for plasminogen kringle 5, which promotes partial closure of the channel. In this study, we demonstrate that VDAC binds tissue-type plasminogen activator (t-PA) on human neuroblastoma SK-N-SH cells. Binding of t-PA to VDAC induced a decrease in K(m) and an increase in the V(max) for activation of its substrate, plasminogen (Pg). This resulted in accelerated Pg activation when VDAC, t-PA, and Pg were bound together. VDAC is also a substrate for plasmin; hence, it mimics fibrin activity. Binding of t-PA to VDAC occurs between a t-PA fibronectin type I finger domain located between amino acids Ile(5) and Asn(37) and a VDAC region including amino acids (20)GYGFG(24). These VDAC residues correspond to a GXXXG repeat motif commonly found in amyloid ß peptides that is necessary for aggregation when these peptides form fibrillar deposits on the cell surface. Furthermore, we also show that Pg kringle 5 is a substrate for the NADH-dependent reductase activity of VDAC. This ternary complex is an efficient proteolytic complex that may facilitate removal of amyloid ß peptide deposits from the normal brain and cell debris from injured brain tissue. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 1 |
| Volume Number | 288 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2013-01-04 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cell Membrane Metabolism Plasminogen Tissue Plasminogen Activator Voltage-Dependent Anion Channels Amino Acids Chemistry Apoptosis Brain Cell Line, Tumor Chromatography Fibrinolysin Fibrinolysis Hot Temperature Kinetics Models, Genetic Protein Binding Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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