Human KRAS Protein, His Tag

The protein has a predicted molecular mass of 21.8 kDa after removal of the signal peptide. The apparent molecular mass of KRAS-His is approximately 15-25 kDa due to glycosylation. This gene, a Kirsten ras oncogene homolog from the mammalian ras gene family, encodes a protein that is a member of the small GTPase superfamily. A single amino acid substitution is responsible for an activating mutation. The transforming protein that results is implicated in various malignancies, including lung adenocarcinoma, mucinous adenoma, ductal carcinoma of the pancreas and colorectal carcinoma. Alternative splicing leads to variants encoding two isoforms that differ in the C-terminal region.