H5041
Cystatin C human
recombinant, expressed in HEK 293 cells, HumanKine®, suitable for cell culture
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About This Item
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biological source
human
Quality Level
recombinant
expressed in HEK 293 cells
Assay
≥95% (SDS-PAGE)
form
lyophilized powder
potency
≤5 μM IC50
quality
endotoxin tested
mol wt
dimer 12-13 kDa (non-glycosylated)
packaging
pkg of 10 μg
storage condition
avoid repeated freeze/thaw cycles
technique(s)
cell culture | mammalian: suitable
impurities
≤1 EU/mg
UniProt accession no.
storage temp.
−20°C
Gene Information
human ... CYTC(1471)
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General description
HumanKine human Cystatin C is expressed as a non-glycosylated monomer in human HEK 293 cells. Cystatin C belongs to the cystatin superfamily. Two isoforms (pI = 7.8, 9.2) of native Cystatin C are found in human urine differentiated by the elimination of small basic peptides or amino acids from the N-terminal end of the protein. This protein is coded by a housekeeping gene, CST3 located on human chromosome 20p11.21 and is generated by nucleated cells.
Application
Cystatin C human has been used as a standard in western blot assay. It has also been used to study its effect on the endopeptidase activity of activated Trichobilharzia regenti isoform of cathepsin B1 peptidase (TrCB1).
Biochem/physiol Actions
Cystatin C is an inhibitor of cysteine proteases including cathepsin B which has been identified as the most important β-amyloid-degrading enzyme. Measurement of cystatin C in serum is replacing creatinine as an indicator of kidney function (glomerular filtration rate, GFR). Studies show its role in predicting new-onset or deteriorating cardiovascular disease. It also seems to play a role in brain disorders involving amyloid, such as Alzheimer′s disease. Cystatin C inhibits transforming growth factor β signaling in normal and cancer cells.
Physical form
Lyophilized from a 0.2 μm filtered solution of 1×PBS
Analysis Note
The inhibitory function of cystatin c on papain′s protease activity was measured by a colorimetric assay using L-BAPA as substrate. IC50 value was measured at 5 to 20 μg/mL (0.3 to 1.5 μM) with a range of 1.56 μg/mL to 50 μg/mL cystatin C in presence of 0.55 μM papain and 0.44 μM L-BAPA.
Legal Information
HumanKine is a registered trademark of Proteintech Group, Inc. and Humanzyme, Inc
Storage Class Code
11 - Combustible Solids
WGK
WGK 3
Flash Point(F)
Not applicable
Flash Point(C)
Not applicable
Certificates of Analysis (COA)
Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.
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Assessment of glomerular filtration rate in acute and chronic settings
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Indian journal of nephrology, 23(3), 180-183 (2013-07-03)
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Assessing kidney function
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Cystatin C Antagonizes Transforming Growth Factor $\beta$ Signaling in Normal and Cancer Cells11Start-up fund from the National Jewish Medical and Research Center and by a grant from the Elsa U. Pardee Foundation to W. Schiemann.
Sokol JP and Schiemann WP
Molecular Cancer Research, 2, 183-195 (2004)
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Under normal conditions, the function of catalytically active proteases is regulated, in part, by their endogenous inhibitors, and any change in the synthesis and/or function of a protease or its endogenous inhibitors may result in inappropriate protease activity. Altered proteolysis
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