Recombinant Human Interleukin-12

Synonyms Natural killer cell stimulatory factor chain 2, NKSF2, Cytotoxic lymphocyte maturation factor 40 kDa subunit, CLMF p40

Accession P29459

GeneID 3592

Source CHO

Molecular Weight Approximately 75 kDa, consisting of a 306 amino acid residue p40 subunit and a 197 amino acid residue p35 subunit.

Quantity 2µg/10µg

AA Sequence p35Subunit :RNLPVATPD PGMFPCLHHS QNLLRAVSNM LQKARQTLEF YPCTSEEIDH EDITKDKTST VEACLPLELT KNESCLNSRE TSFITNGSCL ASRKTSFMMA LCLSSIYEDL KMYQVEFKTM NAKLLMDPKR QIFLDQNMLA VIDELMQALN FNSETVPQKS SLEEPDFYKT KIKLCILLHA FRIRAVTIDR VMSYLNASp4 0Subunit:I WELKKDVYVV ELDWYPDAPG EMVVLTCDTP EEDGITWTLD QSSEVLGSGK TLTIQVKEFG DAGQYTCHKG GEVLSHSLLL LHKKEDGIWS TDILKDQKEP KNKTFLRCEA KNYSGRFTCW WLTTISTDLT FSVKSSRGSS DPQGVTCGAA TLSAERVRGD NKEYEYSVEC QEDSACPAAE ESLPIEVMVD AVHKLKYENY TSSFFIRDII KPDPPKNLQL KPLKNSRQVE VSWEYPDTWS TPHSYFSLTF CVQVQGKSKR EKKDRVFTDK TSATVICRKN ASISVRAQDR YYSSSWSEWA SVPCS

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

Biological Activity Fully biologically active when compared to standard. The ED50 as determined by a cell proliferation assay using PHA-activated human T lymphoblasts is less than 0.05 ng/ml, corresponding to a specific activity of > 2.0 × 107 IU/mg.

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 rHuIL-12 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.

Usage This material is offered by Shanghai PrimeGene Bio-Tech for research, laboratory or further evaluation purposes. NOT FOR HUMAN USE.

Reference 1. Yoon C, Johnston SC, Tang J, et al. 2000. EMBO J. 19:3530-41.

2. Oppmann B, Lesley R, Blom B, et al. 2000. Immunity. 13:715-25.

Background Interleukin-12 (IL-12), also known as NKSF or CLMF, is a pleiotropic cytokine originally identified in the medium of activated human B lymphoblastoid cell lines. The p40 subunit of IL-12 has been shown to have extensive amino acid sequence homology to the extracellular domain of the human IL-6 receptor while the p35 subunit shows distant but significant sequence similarity to IL-6, G-CSF, and chicken MGF. These observations have led to the suggestion that IL-12 might have evolved from a cytokine/soluble receptor complex. Human and murine IL-12 share 70 % and 60 % amino acid sequence homology in their p40 and p35 subunits, respectively. IL-12 apparently shows species specificity with human IL-12 reportedly showing minimal activity in the murine system.