Related Experiment Video
Updated: Jun 29, 2025
07:08
Fully Processed Recombinant KRAS4b: Isolating and Characterizing the Farnesylated and Methylated Protein
Published on: January 16, 2020
5.7K
Production of Isotopically Labeled KRAS4b
Troy Taylor1, William Gillette2
1NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD, USA.
Methods in Molecular Biology (Clifton, N.J.)
|April 3, 2024
Summary
This study presents efficient methods for producing isotopically labeled proteins, crucial for structural biology and drug development. Optimized protocols yield high-purity labeled KRAS4b, enabling advanced multi-isotope and site-specific labeling strategies.
Area of Science:
- Proteomics
- Structural Biology
- Drug Development
Background:
- Isotopically labeled proteins are essential tools in structural biology and targeted drug development.
- Advancements in protein labeling are driven by the need for complex multi-isotope labeling strategies.
Purpose of the Study:
- To develop reliable and efficient methods for producing isotopically labeled KRAS4b.
- To enable various labeling strategies, including multi-isotope and site-specific labeling.
Main Methods:
- High-level soluble KRAS4b expression combined with optimized isotope incorporation protocols.
- Modification of fermentation medium during the weaning process to improve growth with deuterium.
- Achieved nearly 100% nitrogen-15 (15N) incorporation.
Main Results:
- Yields of 1.3-24.6 mg/L (median 6.4 mg/L) of isotopically labeled KRAS4b were achieved.
- Fermentation time was reduced from 5 days to 3 days by optimizing growth parameters with deuterium.
- Methods are compatible with both multi-isotope and site-specific labeling.
Conclusions:
- The developed methods provide a reliable and efficient approach for producing isotopically labeled proteins.
- These advancements facilitate complex labeling strategies for structural biology and drug development applications.
