膜杰作
Star Staining
分子别名（Synonym）
GTPase Kras,K-Ras 2,Ki-Ras,c-K-ras,c-Ki-ras,KRAS2,RASK2,C-K-RAS,CFC2,K-RAS2A,K-RAS2B,K-RAS4A,K-RAS4B,KI-RAS,KRAS1,KRAS2,NS,NS3,RASK2,KRAS
表达区间及表达系统（Source）
Human KRAS (2-185,G12D), His Tag (KRS-H51H4) is expressed from E. coli cells. It contains AA Thr 2 - Cys 185 (Accession # P01116-2 (G12D)).
Request for sequence
蛋白结构（Molecular Characterization）
This protein carries a polyhistidine tag at the N-terminus
The protein has a calculated MW of 23.0 kDa. The protein migrates as 25-27 kDa under reducing (R) condition (SDS-PAGE).
内毒素（Endotoxin）
Less than 1.0 EU per μg by the LAL method.
纯度（Purity）
>95% as determined by SDS-PAGE.
>90% as determined by SEC-MALS.
制剂（Formulation）
Lyophilized from 0.22 μm filtered solution in 50mM Tris,500mM NaCl pH7.3 with trehalose as protectant.
Contact us for customized product form or formulation.
重构方法（Reconstitution）
Please see Certificate of Analysis for specific instructions.
For best performance, we strongly recommend you to follow the reconstitution protocol provided in the CoA.
存储（Storage）
For long term storage, the product should be stored at lyophilized state at -20°C or lower.
Please avoid repeated freeze-thaw cycles.
This product is stable after storage at:
- -20°C to -70°C for 12 months in lyophilized state;
- -70°C for 3 months under sterile conditions after reconstitution.
电泳（SDS-PAGE）
Human KRAS (2-185,G12D), His Tag on SDS-PAGE under reducing (R) condition. The gel was stained with Coomassie Blue. The purity of the protein is greater than 95%.
SEC-MALS
The purity of Human KRAS (2-185,G12D), His Tag (Cat. No. KRS-H51H4) is more than 90% and the molecular weight of this protein is around 24-34 kDa verified by SEC-MALS.
Report
活性（Bioactivity）
The specific activity of KRAS was determined to be > 300 pmol/min/mg in a GTPase-Glo assay using GTP solution substrate (QC tested).
Protocol
背景（Background）
KRAS (Kirsten rat sarcoma 2 viral oncogene homolog) gene is a proto-oncogene that encodes a small GTPase transductor protein called KRAS. KRAS is also known as Ki-Ras, c-K-ras and
c-Ki-ras. Ras proteins bind GDP/GTP and possess intrinsic GTPase activity. Plays an important role in the regulation of cell proliferation, promoting oncogenic events by inducing transcriptional silencing of tumor suppressor genes (TSGs) in colorectal cancer (CRC) cells in a ZNF304-dependent manner. RAS is one of the most frequently mutated oncogenes in human cancer but the frequency and distribution of RAS gene mutations are not uniform. In details, mutation of glycine 12 (G12) causes RAS activation by interfering with GAP binding and GAP-stimulated GTP hydrolysis. The reference shows the pathway may as a potential therapy targets.
