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Active Granzyme K (GZMK)

GZM-K; TRYP2; PRSS; Serine Protease,Granzyme 3; Tryptase II; Fragmentin-3; Granzyme-3; NK-tryptase-2

ACTIVITY TEST

Granzyme K is a member of the granzyme family of the serine proteases found specifically in the cytotoxic granules of cytotoxic T lymphocytes (CTL) and natural killer (NK) cells. Human granzyme K is synthesized as a precursor (264 residues) with a signal peptide (residues 124), a propeptide (residues 25-26) and a mature chain (residues 27-264). The purified recombinant human Granzyme K consists of residues 27 to 264 which activity was measured by its ability to cleaves a thioester substrate Z-Lys-SBzl•HCl. The reaction was performed in 0.05 M Tris, 0.15 M NaCl, 0.01% Triton X-100, pH 8.0 (assay buffer), initiated by addition 50 μL of various concentrations of GZMK (diluted by assay buffer) to 50 µL of 1.2 mM substrate and DTNB mixture. The final well serves as a negative control with no GZMK, replace with 50 μL assay buffer. Incubated at 25℃ for 5min, then read at a wavelength of 405 nm. The specific activity of recombinant human Granzyme K is >220 pmol/min/µg.

USAGE

Reconstitute in 10mM PBS (pH7.4) to a concentration of 0.1-1.0 mg/mL. Do not vortex.

STORAGE

Avoid repeated freeze/thaw cycles. Store at 2-8°C for one month. Aliquot and store at -80°C for 12 months.

STABILITY

The thermal stability is described by the loss rate. The loss rate was determined by accelerated thermal degradation test, that is, incubate the protein at 37°C for 48h, and no obvious degradation and precipitation were observed. The loss rate is less than 5% within the expiration date under appropriate storage condition.

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Magazine Citations
Immunobiology. Granzyme M and K release in human experimental endotoxemia science:S0171298516300225
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