Glypican 1 (GPC1) Active Protein

The Glypicans (glypiated proteoglycans) are a small multigene family of GPI-linked proteoglycans that play a key role in growth factor signaling (1, 2, 3, 4). There are currently six known mammalian Glypicans. They all share a common-sized protein core of 60-70kD, an N-terminus which likely forms a compact globular domain, 14 conserved cysteines that form multiple intrachain disulfide bonds, and a number of C-terminal N- and O-linked carbohydrate attachment sites. Based on exon organization and the location of O-linked glycosylation sites, at least two subfamilies of Glypicans are known. One subfamily contains Glypicans 1, 2, 4 and 6, while another subfamily contains Glypicans 3 and 5 (3, 5). Mouse Glypican 1 (GPC-1) is synthesized as a 557 amino acid (aa) preproprecursor that contains a 23 aa signal sequence, a 506 aa mature segment, and a 28 aa C-terminal prosegment (6, 7). There are two potential N-linked, and four potential O-linked sites for glycosylation or glycanation. There is at least one heparan sulfate (HS) modification on GPC-1 that contributes to a native molecular weight of approximately 110kD (8, 9). Mature mouse GPC-1 shares 91% and 98% aa identity with mature human and rat GPC-1, respectively. There are two potential splice variants of mouse GPC-1. The first is truncated and shows a seven amino acid substitution for the first 294 amino acids; the second reveals an alternate start site at Met73 (10, 11). Cells known to express GPC-1 include neurons, smooth and skeletal muscle cells, keratinocytes, osteoblasts, Schwann cells, immature dendritic cells, and tumor, plus tumor-associated vascular endothelial cells (8, 9, 12-15). The function of GPC-1 is complex and varied. As a proteoglycan, it appears to make use of its HS adduct to impact select growth factor activity (16). GPC-1 accomplishes its co-receptor role by having juxtramembrane HS attachment sites and a flexible, GPI-linkage (17). Recent data suggests GPC-1 and sulfation enzymes may collaborate to regulate FGF signaling. HS modules that are rich in 2-O- and 6-O- sulfate upregulate FGF-2 activation of FGFR1c (18). Similarly, FGF-1 requires both 2-O- and 6-O-sulfation to bind to FGFR2c and 3c. By contrast, FGF-1 requires no sulfation to bind to FGFR2b, and FGF-8b needs only 6-O-sulfation to activate FGFR3c. Thus, many FGF receptor isoform specific effects may be attributed to an interaction between Glypican family members and the cell sulfation system (19).

A DNA sequence encoding the mature mouse Glypican 1 (Asp 24-Ser 529; Accession # Q9QZF2) was fused to a six-hisidine tag at the C-terminus. The protein was expressed in a mouse myeloma cell line, NS0.
Calculated molecular mass of 56.4kD. As a result of glycosylation, the recombinant protein migrates as an ~ 57-62kD protein in SDS-PAGE under reducing conditions.

Small volumes of GPC1 active protein vial(s) may occasionally become entrapped in the seal of the product vial during shipment and storage. If necessary, briefly centrifuge the vial on a tabletop centrifuge to dislodge any liquid in the container`s cap. Certain products may require to ship with dry ice and additional dry ice fee may apply.

MBS637259 is an active protein targeting GPC1. Also known as Glypican 1, Recombinant, Mouse (Glypiated Proteoglycan 1). Host: Recombinant Mouse.