• Detect activated (GTP-bound) Cdc42 protein in cell and tissue lysates
• Assay of choice when lysate quantity is limiting, e.g., primary cell cultures
• Study Cdc42 signaling pathways
• Screen for Cdc42 activation inhibitors

Kit contents (24 - 96 assays: strip-wells allow single or multiple assays per run)

• 96 well Cdc42-GTP binding plate
• Anti Cdc42 antibody
• Secondary detection HRP labeled antibody
• Cdc42 control protein (constitutively active Cdc42)
• 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 Cdc42 G-LISA® assay isolates active Cdc42/Rac (GTP-bound form) using the Cdc42/Rac-binding domain (PBD) of an effector protein coupled to a 96-well strip plate. The bound Cdc42 is then detected and quantified using a colorimetric ELISA-based method and a Cdc42-specific antibody.

Key characteristics

• Quantitative assay
• Detection sensitivity: Linear between 20 pg – 3 ng of activated Cdc42
• Detection specificity: Cdc42
• Input requirements: 10 – 50 µg of cell or tissue lysate per assay
• Timeframe: Approximately 3 hours