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- W2439944338 abstract "Post-translational modifications in proteins play a major functional role. Post-translational modifications affect the way proteins interact with each other, bind nucleotides, and localize in cellular compartments. Given the importance of post-translational modifications in protein biology, development of methods to produce post-translationally modified proteins for biochemical and biophysical studies is timely and significant. At the same time, obtaining post-translationally modified proteins in bacterial expression systems is often problematic. Here, we describe a novel recombinant approach to prepare human K-Ras 4B, a protein that is post-translationally farnesylated, proteolytically cleaved, and methylated in its C-terminus. K-Ras 4B is a member of the Ras subfamily of small GTPases and is of interest because it is frequently mutated in human cancer. The method relies on separate production of two structural domains-the N-terminal catalytic domain and the C-terminal peptide chemically modified with S-farnesyl-L-cysteine methyl ester. After the two domains are prepared, they are ligated together using the transpeptidase enzyme, sortase. Our procedure starts with the use of the plasmid of K-Ras 4B catalytic domain containing the sortase recognition sequence. After this, we describe the bacterial expression and purification steps used to purify K-Ras 4B and the preparation of the conjugated C-terminal peptide. The procedure ends with the sortase-mediated ligation technique. The produced post-translationally modified K-Ras 4B is active in a number of assays, including a GTP hydrolysis assay, Raf-1 binding assay, and surface plasmon resonance-based phospholipid binding assay." @default.
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- W2439944338 date "2013-12-26" @default.
- W2439944338 modified "2023-10-09" @default.
- W2439944338 title "A Novel Method for the Production of Fully Modified K-Ras 4B" @default.
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- W2439944338 doi "https://doi.org/10.1007/978-1-62703-791-4_2" @default.
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