Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UNIPROT:P11021 (BiP)
 2,049 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The cDNA that encodes full-length human plasminogen (Glu1-hPg) has been expressed in Drosophila Schneider S2 cells under the influence of the Drosophila BiP protein signal sequence, which allowed the protein to be secreted into the medium. A procedure was devised for clonal selection of high-expressing cells, which were then used for large-scale expression of 10-15 mg/liter of the protein in the culture medium. The protein produced using this system was extensively characterized and contained full-length recombinant (r) Glu1-hPg plasminogen. As with human plasma Glu1-hPg, the S2-expressed protein underwent the Cl--induced transition to the tight conformation, which resulted in a weakly activatable zymogen. The addition of the ligand, epsilon-amino caproic acid, induced the relaxed conformation of r-Glu1-hPg, which was highly activatable, again in agreement with similar data for human plasma Glu1-hPg. The thermal stability of the S2-expressed r-Glu1-hPg also correlated well with that of human plasma hPg. These studies show that intact r-Glu1-hPg can be produced in high yield in Drosophila Schneider S2 cells, which possesses similar properties to its human plasma counterpart.
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PMID:Expression of human plasminogen in Drosophila Schneider S2 cells. 1033 71

The 78 kDa glucose-regulated protein (GRP78) is an endoplasmic reticulum chaperone, whose function is generally thought to be restricted to controlling the structural maturation of nascent glycoproteins. However, GRP78 also is expressed on the cell surface where it functions as a receptor for a wide variety of ligands, behaving as an autoantigen for several classes of autoantibodies. GRP78 is a signaling receptor for activated alpha2-macroglobulin, plasminogen kringle 5, and microplasminogen, and it plays a critical role in viral entry of coxsackie B, and dengue fever viruses. GRP78 is also implicated in the regulation of tissue factor procoagulant activity and functions as a receptor for angiogenic peptides via a mechanism independent of the VEGF receptor. Cell surface GRP78 is found associated with such diverse proteins as the voltage-dependent anion channel (VDAC), the major histocompatibility complex class I (MHC-I), the teratocarcinoma-derived growth factor I (Cripto), and the DnaJ-like protein MTJ-1. These associations suggest a unique GRP78 cell surface topography, which appears to be compartmentalized to respond differently to agonists that bind to its N- or C-terminal domains. Here, we discuss the significance of these associations, and the possible mechanisms involved in the transportation of GRP78 from the cytosol to the cell surface.
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PMID:GRP78: a multifunctional receptor on the cell surface. 1933 44