Recombinant Human Plexin B3 Protein, CF

Catalog # Availability Size / Price Qty
4958-PC-050
R&D Systems Recombinant Proteins and Enzymes
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Recombinant Human Plexin B3 Protein, CF Summary

Product Specifications

Purity
>90%, by SDS-PAGE under reducing conditions and visualized by silver stain
Endotoxin Level
<0.10 EU per 1 μg of the protein by the LAL method.
Activity
Measured by its binding ability in a functional ELISA. Immobilized rhPlexin B3 at 5 µg/mL can bind rhTHBS-2 (Catalog # 1635-T2) with an apparent KD < 10 nM.
Source
Mouse myeloma cell line, NS0-derived human Plexin B3 protein
His45-Gln1255 (Glu1156Asp), with a C-terminal 6-His tag
Accession #
N-terminal Sequence
Analysis
His45
Predicted Molecular Mass
129.6 kDa
SDS-PAGE
150-160 kDa, reducing conditions

Product Datasheets

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4958-PC

Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.

4958-PC

Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution Reconstitute at 100 μg/mL in sterile PBS.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.
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Background: Plexin B3

Plexin B3 is a type I transmembrane glycoprotein that belongs to the Plexin B subfamily of semaphorin receptors (1, 2). Human Plexin B3 contains a 44 amino acid (aa) signal sequence, a 1211 aa extracellular domain (ECD), a 21 aa transmembrane domain, and a 633 aa cytoplasmic domain that includes features common to other Plexins, such as an LRR (C1) and LRF (C2) domain, and a PDZ motif common to B Plexins (1). The PDZ motif is thought to be involved in RhoA activation and axonal growth cone collapse downstream of semaphorin engagement (3). The human Plexin B3 ECD shares 81%, 81%, 83% and 75% aa identity with mouse, rat, bovine and canine Plexin B3, respectively. It contains a sema domain and a Plexin-semaphorin-integrin (PSI) or Met-related sequence (MRS) domain, each of which contains a potential proteolytic cleavage site (2). Detection of 160 and 140 kDa species along with the full-length 260 kDa Plexin B3 in homogenates of human neocortex indicates that proteolytic processing may occur in vivo (2). The ECD also contains four glycine/proline-rich IPT/TIG domains, which are immunoglobulin-like domains found in Plexins, transcription factors, and the scatter factor receptors Met and Ron. B Plexins, including Plexin B3, can interact with Met and Ron, activating these receptors upon semaphorin engagement (4, 5). Plexin B3 and its identified ligand, the transmembrane semaphorin Sema5A, are both expressed during differentiation and migration of central nervous system oligodendrocytes (5 - 7). However, the developmental functions of Sema5A are likely independent of Plexin B3, which is not significantly expressed prenatally (8). In turn, Plexin B3 may exhibit Sema5A-independent activity, as homophilic interactions of sema domains are reported to stimulate neurite outgrowth of postnatal cerebellar neurons (2).

References
  1. Negishi, M. et al. (2005) Cell. Mol. Life Sci. 62:1363.
  2. Hartwig, C. et al. (2005) BMC Neurosci. 6:53.
  3. Swiercz, J.M. et al. (2002) Neuron 35:51.
  4. Conrotto, P. et al. (2004) Oncogene 23:5131.
  5. Artigiani, S. et al. (2004) EMBO Rep. 5:710.
  6. Goldberg, J.L. et al. (2004) J. Neurosci. 24:4989.
  7. Worzfeld, T. et al. (2004) Eur. J. Neurosci. 19:2622.
  8. Fiore, R. et al. (2005) Mol. Cell. Biol. 25:2310.
Entrez Gene IDs
5365 (Human); 140571 (Mouse); 363517 (Rat)
Alternate Names
PLEXB3; Plexin B3; plexin-B3; PLEXR; PLXN6; PLXNB3

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