• Detect activated (GTP-bound) Ras protein in cell and tissue lysates
• Assay of choice when lysate quantity is limiting, e.g., primary cell cultures
• Study Ras signaling pathways
• Screen for Ras activation inhibitors

Kit contents (96 assays: strip-wells allow single or multiple assays per run)

• 96-well Ras-GTP binding plate
• Anti-Pan Ras antibody
• Secondary detection HRP-labeled antibody
• Ras control protein (constitutively active H-Ras)
• Cell lysis buffer- optimized for maintenance of GTP-bound GTPases
• Binding buffer
• Wash buffer
• Antigen-presenting buffer
• Antibody dilution buffer
• HRP colorimetric detection reagents A & B
• HRP stop solution
• Precision Red advanced protein assay reagent
• Protease inhibitor cocktail
• Strip holder

Equipment & materials required

• Cell lysates
• Cell scraper for harvesting cells
• Concentrated sulfuric acid (1 ml)
• Liquid nitrogen for snap freezing lysates
• Orbital microplate shakers (min 200 rpm) one at 4°C and one at room temperature
• Multiwell pipette
• Microplate spectrophotometer (490 nm)

The Ras G-LISA® assay isolates active Ras (GTP-bound form) using the Ras-binding domain (RBD) of an effector protein coupled to a 96-well strip plate. The bound Ras is then detected and quantified using a colorimetric ELISA-based method.

Key characteristics

• Quantitative assay
• Detection sensitivity: Linear between 50 pg – 2 ng of activated Ras
• Detection specificity: N-Ras, H-Ras, K-Ras (can be adapted to specific Ras isotypes)
• Input requirements: 10 – 50 µg of cell or tissue lysate per assay (e.g., primary cell cultures)
• Timeframe: Approximately 3 hours