Recombinant Human MuSK His-tag Protein, CF Summary
Leu24-Thr495, with a C-terminal 6-His tag
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.
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.
|Formulation||Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose.|
|Reconstitution||Reconstitute at 500 μg/mL in 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.
2 μg/lane of Recombinant Human MuSK His-tag Protein (Catalog # 10189-MK) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 62-75 kDa.
Musk (muscle-specific kinase) is a 53 kDa type I transmembrane (TM) protein belonging to the receptor tyrosine kinase family (1). It contains a 472 aa extracellular domain (ECD), a 21 aa transmembrane domain, and a 353 cytoplasmic domain (1). Within the ECD, Human Musk shares 91% and 92% aa sequence identity with mouse Musk and rat Musk, respectively. It is found in the postsynaptic membrane of skeletal muscle motor endplates (2). Human Musk has multiple isoforms. One contains deletions at residues 307‑394 and 454‑461, while a second is a short soluble form that contains residues 120‑209 plus a unique 24 aa C‑terminal tail (3). Musk binds the heparin sulfate proteoglycan Agrin to promote acetylcholine receptor clustering. It has also been found to bind with low-density lipoprotein receptor-related protein 4 (LRP4) (4), Wnt ligands (5), Biglycan (6), and ColQ (7). Recent studies have showed that Musk does not bind Agrin directly, but enhanced the MuSK-LRP4 interaction (7, 8). When Agrin binds to the N-Terminal region of LRP4, this promotes the association of LRP4 and Musk, which then stimulates Musk kinase activity (9, 10).
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- Nasrin, F. et al. (2014) Sci. Rep. 4:6841.
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- Otsuka, K. et al (2015) Scientific Reports. 5:13928.
- Zhang, B. et al. (2008) Neuron 60:285.
- Zhang, W. et al. (2011) J Biol Chem. 286(47):40624.
- Burden, S.J. et al. (2017) CSH Perspectives Biol. 5:a009167.
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