名称：重组人Nesfatin-1

Synonyms：Nucleobindin 2

Accession：P80303

GeneID：4925

Source：Escherichia coli.

Molecular Weight：Approximately 9.6 kDa, a single non-glycosylated polypeptide chain containing 82 amino acids.

Quantity：20μg/100μg/1000μg

AA Sequence：VPIDIDKTKV QNIHPVESAK IEPPDTGLYY DEYLKQVIDV LETDKHFREK LQKADIEEIK SGRLSKELDL VSHHVRTKLD EL

Purity：> 95 % by SDS-PAGE and HPLC analyses.

Biological Activity：Fully biologically active when compared to standard. The biological activity is tested by in vivo assay using healthy wild type male mice (C57BL/6J).

Physical Appearance：Sterile Filtered White lyophilized (freeze-dried) powder.

Formulation：Lyophilized from a 0.2 μm filtered concentrated solution in PBS, pH 7.4.

Endotoxin：Less than 1 EU/μg of rHuNesfatin-1 as determined by LAL method.

Reconstitution：We recommend that this vial be briefly centrifuged prior to opening to bring the contents to the bottom. Reconstitute in sterile distilled water or aqueous buffer containing 0.1 % BSA to a concentration of 0.1-1.0 mg/mL. Stock solutions should be apportioned into working aliquots and stored at ≤ -20 °C. Further dilutions should be made in appropriate buffered solutions.

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.

Reference：1. Yang M, Zhang Z, Wang C, et al. 2012. Diabetes, 61: 1959-68.
2. Xia ZF, Fritze DM, Li JY, et al. 2012. Am J Physiol Gastrointest Liver Physiol, 303: G570-7.
3. Cowley MAandGrove KL. 2006. Cell Metab, 4: 421-2.
4. Pan W, Hsuchou H, Kastin AJ. 2007. Peptides, 28: 2223-8.

Background：Nesfatin is a metabolic polypeptide and is the N-terminal region of the precursor protein, Nucleobindin2 (encoded by NUCB2 gene). It is a naturally occurring protein and originally identified as a hypothalamic neuropeptide. Additionally, Nesfatin can be found in other areas of brain, and in pancreatic isletsβ-cells, gastric endocrine cells and adipocytes. It is responsible for regulating appetite and production of body fat. Excess nesfatin-1 in the brain leads to a loss of appetite, less frequent hunger, a 'sense of fullness', and a drop in body fat and weight. A lack of nesfatin-1 in the brain leads to an increase of appetite, more frequent episodes of hunger, an increase of body fat and weight, and the inability to 'feel full'.

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