R-Spondin 3 Antibody [Unconjugated] Summary
| Immunogen |
Chinese hamster ovary cell line CHO-derived recombinant human R-Spondin 3
Gln22-His272 Accession # Q9BXY4 |
| Specificity |
Detects human R-Spondin 3 in direct ELISAs. In direct ELISAs, less than 10% cross-reactivity with recombinant mouse R-Spondin 3 is observed.
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| Source |
N/A
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| Isotype |
IgG
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| Clonality |
Polyclonal
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| Host |
Sheep
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| Gene |
RSPO3
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| Endotoxin Note |
<0.10 EU per 1 μg of the antibody by the LAL method.
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Applications/Dilutions
| Dilutions |
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Packaging, Storage & Formulations
| Storage |
Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
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| Buffer |
Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied as a 0.2 µm filtered solution in PBS.
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| Preservative |
No Preservative
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| Concentration |
LYOPH
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| Reconstitution Instructions |
Sterile PBS to a final concentration of 0.2 mg/mL.
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Notes
Alternate Names for R-Spondin 3 Antibody [Unconjugated]
- Cristin 1
- CRISTIN1
- FLJ14440
- hPWTSR
- hRspo3
- Protein with TSP type-1 repeat
- PWTSR
- Roof plate-specific spondin-3
- RSPO3
- R-spondin 3 homolog (Xenopus laevis)
- RSpondin 3
- R-Spondin 3
- R-spondin-3
- Thrombospondin type-1 domain-containing protein 2
- thrombospondin, type I, domain containing 2
- THSD2
Background
R-Spondin 3 (RSPO3, roof plate-specific spondin 3), also called cysteine-rich and single thrombospondin domain containing-1 (Cristin 1), is an ~31 kDa secreted protein that shares ~40% amino acid (aa) identity with the other three R-Spondin family members (1, 2). All are positive modulators of Wnt/ beta -catenin signaling, but each has a distinct expression pattern (1-4). Like other R-spondins, R-Spondin 3 contains two adjacent cysteine-rich furin-like domains (aa 35-135) with one potential N-glycosylation site (aa 36), followed by a thrombospondin (TSP-1) motif (aa 147-207) and a region rich in basic residues (aa 211-269). Only the furin-like domains are needed for beta -catenin stabilization (2). Within aa 21-209, human R-Spondin 3 shares 93%, 92%, 97%, 96% and 92% aa identity with mouse, rat, equine, bovine and canine R-Spondin 3, respectively. Potential isoforms of 279 and 297 aa diverge at aa 210 and 276, respectively (5). Mouse R-Spondin 3 is critical for development of the placental labyrinthine layer, probably by promoting VEGF expression and thus vascular development (6, 7). It is also essential for expression of the placenta-specific transcription factor, Gcm1. In the mouse embryo, R‑Spondin 3 is often expressed by or located near endothelial cells (6). It is found in the roof plate, tail, somites, otic vesicles, cephalic mesoderm, truncus arteriosus, atrioventricular canal of the developing heart, and strongly but transiently in developing limbs (4, 7). R-Spondins regulate Wnt/ beta -catenin by competing with the Wnt antagonist DKK-1 for binding to the Wnt co-receptors LRP-6 and Kremen, reducing their DKK-1-mediated internalization (8, 9). Reports differ on whether R-Spondins bind LRP-6 directly (8-10). R-Spondin 3 has also been identified as an oncogene (11).