Recombinant Mouse Klotho (aa 35-982) Protein, CF 50 UG

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Recombinant Mouse Klotho (aa 35-982) Protein, CF 50 UG信息二维码

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产品介绍

    基本参数

    详细说明

    • Purity

      >90%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.

    • Endotoxin Level

      <0.01 EU per 1 μg of the protein by the LAL method.  

    • Activity

      Measured in a cell proliferation assay using BaF3 mouse pro‑B cells transfected with human FGF RIIIc. The ED    50 for this effect is 0.04-0.4 µg/mL in the presence of 1 µg/mL of Recombinant Human FGF‑23 (Catalog # ) and 10 µg/mL of heparin.

    • Source

      Chinese Hamster Ovary cell line, CHO-derived Ala35-Lys982 (Arg948Lys), with a C-terminal 6-His tag

    • Accession #

    • N-terminal Sequence    
      Analysis

      Ala35

    • Predicted Molecular Mass

      109.5 kDa

    • SDS-PAGE

      125-130 kDa, reducing conditions

    1819-KL

     

    Formulation Supplied as a 0.2 μm filtered solution in PBS, Glycerol and EDTA.





    Shipping The product is shipped with polar packs. 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, -70 °C as supplied.

    • 1 month, 2 to 8 °C under sterile conditions after opening.


    Background: Klotho

    Klotho, also called Klotho-alpha, is the founding member of the Klotho family within the glycosidase-1 superfamily (1, 2). Klotho is expressed in areas concerned with calcium regulation, predominantly in the kidney distal convoluted tubules, but also in the brain choroid plexus (which produces cerebrospinal fluid) and the parathyroid (1). The 1014 amino acid (aa) type I transmembrane protein contains a 34 aa signal sequence, a 948 aa extracellular domain (ECD) containing two extracellular glycosidase-like domains, a 21 aa transmembrane domain and an 11 aa intracellular domain. Within the ECD, mouse Klotho shares 95%, 87% and 87% aa identity with rat, human and equine Klotho, respectively. Although a truncated 554 aa isoform predicts a soluble 70 kDa form, the soluble form found in plasma and cerebrospinal fluid is a 130 kDa form produced by proteolytic cleavage of the glycosylated 135 kDa full-length Klotho (3, 4). A prominent intracellular 120 kDa form of Klotho is localized to endoplasmic reticulum and Golgi membranes (4). Klotho is named for the Greek goddess who spins the thread of life. The phenotype of Klotho-deficient mice resembles premature aging, including arteriosclerosis, osteoporosis, skin atrophy, infertility, emphysema and premature death (2). Conversely, excess Klotho extends lifespan (5). Klotho acts as a cofactor for interaction of FGF23 with FGF R1 (6). This interaction negatively regulates 1 alpha -hydroxylase, the rate-limiting enzyme in the synthesis of 1,25(OH)2D3 (vitamin D) (7). Klotho-deficient mice show severe hyperphosphatemia and ectopic calcification of soft tissues due to excess vitamin D (2, 7). Both Klotho and Klotho-beta are cofactors for FGF19 binding (8). Klotho also shows glucuronidase activity which activates the renal ion channel TRPV5 to reabsorb urinary calcium (9). Klotho has been reported to downregulate insulin or IGF-1 signaling in adipocytes, to bind and antagonize Wnt molecules, and to facilitate release of parathyroid hormone (10 - 12).

    • References:

      1. Nabeshima, Y. (2006) Sci. Aging Knowl. Environ. 8:pe11. 

      2. Kuro-o, M. et al. (1997) Nature 390:45. 

      3. Shiraki-Iida, T. et al. (1998) FEBS Lett. 424:6. 

      4. Imura, A. et al. (2004) FEBS Lett. 565:143. 

      5. Kurosu, H. et al. (2005) Science 309:1829. 

      6. Kurosu, H. et al. (2006) J. Biol. Chem. 281:6120. 

      7. Tsujikawa, H. et al. (2003) Mol. Endocrinol. 17:2393.

      8. Wu, X. et al. (2007) J. Biol. Chem. 282:29069.

      9. Chang, Q. et al. (2005) Science 310:490.

      10. Yamamoto, M. et al. (2005) J. Biol. Chem. 280:38029.

      11. Liu, H. et al. (2007) Science 317:803.

      12. Imura, A. et al. (2007) Science 316:1615.

    • Entrez Gene IDs:

      9365 (Human); 16591 (Mouse)

    • Alternate Names:

      EC 3.2.1; EC 3.2.1.31; KL; Klotho






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