KRAS Isoform B Coupled Nucleotide Exchange Assay Kit

Catalog #

78583

$1,355 *

Size: 384 reactions

Qty

Bulk/Custom

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*US Pricing only. For international pricing, please contact your local distributor.

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Description

The KRAS IsoformB Coupled Nucleotide Exchange Assay Kit is designed for screening and profiling of KRAS IsoformB antagonists/inhibitors by monitoring the binding of an effector protein such as the Ras binding domain of Raf1, (RBD-cRaf) to KRAS. With this kit, a few simple steps on a microtiter plate are required for nucleotide exchange detection. First, a sample containing GDP-loaded KRAS Isoform B is incubated with SOS1 and GTP for the nucleotide exchange. Next, RBD-cRAF is added and incubated for the
effector-RAS binding. Then, acceptor and donor beads are added and incubated for detection followed by reading the Alpha-counts.

SOS1(son of sevenless)is a guanine nucleotide exchange factor that facilitates the exchange of GDP for GTP. GDP-loaded KRAS Isoform B is in an inactive state and does not interact with the Ras-binding domain (RBD) of cRAF. SOS1 assists in the release of GDP from KRAS Isoform B so that GTP can occupy the nucleotide binding pocket. This results in a conformational change in KRAS IsoformB that permits its binding to RBD-cRAF. The KRAS IsoformB Coupled Nucleotide Exchange Assay Kit utilizes GST-tagged RBD-cRAF and His-tagged KRAS Isoform B to assay binding of KRAS to RBD-cRAF in the Alpha assay. Glutathione acceptor and Ni chelate donor beads are brought into proximal range by the binding of KRAS and RBD-cRAF, enabling the energy transfer from the donor to acceptor beads after laser excitation.

Figure 1: Illustration of the assay principle.

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Product Data Gallery

Nucleotide exchange of KRAS IsoformB.

Effect of KRAS inhibitors on the nucleotide exchange of KRAS Isoform B.

Product Info

Storage and Usage

Citations

Assay Kit Format

AlphaLISA®

Supplied As

The KRAS IsoformB Coupled Nucleotide Exchange Assay Kit comes in a convenient 384-well format, with enough purified recombinant GDP-loaded KRAS Isoform B, GTP, exchange factor SOS1, an effector protein RBD-cRAF, assay buffer and additives for 400 reactions.

Materials Required But Not Supplied

Name	Ordering Information
AlphaLISA® Glutathione acceptor beads, 5 mg/ml	PerkinElmer #AL109C
AlphaScreen® Nickel Chelate donor beads, 5 mg/ml	PerkinElmer #AS101D
Optiplate - 384	PerkinElmer #6007290
AlphaScreen® microplate reader
Adjustable micropipettor and sterile tips

Format

Catalog #	Name	Amount	Storage
101522	GDP-loaded KRAS Isofrom B,His-Tag*	5 µg	-80°C
101573	SOS1, FLAG-Tag*	50 µg	-80°C
100519	RBD-cRAF, GST-Tag*	5 µg	-80°C
79861-2	GTP (10 mM)	0.5 ml	-20°C
	RBD-RAS Binding Buffer(Incomplete)	2 x 3 ml	-20°C
	DTT (0.5 M)	2 x 200 µl	-20°C
79311	3x Immuno Buffer 1	4 ml	-20°C

*The concentration of the protein is lot-specific and will be indicated on the tube

UniProt #

P01116

Background

High levels of wild-type KRAS cause a slowing of cell replication and growth, and increased apoptosis. This can be induced by cellular stress, certain types of radiation, chemical signals, and other prompts. Wild-type KRAS may also protect against mutant KRAS over-activation by dimerizing with mutant KRAS protein.

The study of differences in the behavior of the wild-type and mutated forms of KRAS is especially important since KRAS mutations are responsible for more than 30% of human cancers. Compounds that affect the nucleotide exchange (GDP to GTP) reaction provide a novel approach to the inhibition of tumor cell growth in KRAS-driven tumors. In 2021, the Food and Drug Administration granted approval for use of AMG510 (Sotorasib), a potent KRAS G12C inhibitor for non-squamous non-small cell lung cancer.

Storage/Stability

This assay kit will perform optimally for up to 6 months from date of receipt when the materials are stored as directed.

Applications

Screen small molecule inhibitors or antagonists that affect KRAS Isoform B nucleotide-binding status in
high throughput (HTS) applications.
Counter-screen for the compounds that affect mutated forms of KRAS

Shipping Temperature

-80°C

Contraindications

Green and blue dyes, such as Trypan Blue, absorb light in the AlphaScreen® signal emission range (520-620 nm). Avoid the use of the potent singlet oxygen quenchers such as sodium azide (NaN3) or metal ions (Fe2+, Fe3+, Cu2+, Zn2+ and Ni2+). The presence of >1% RPMI 1640 culture medium leads to a signal reduction due to the presence of excess biotin and iron in this medium. MEM, which lacks these components, does not affect AlphaScreen® assays.

Warnings

Avoid freeze/thaw cycles

Disclaimers and Limitations

BPS Bioscience assay kits are validated using the listed components according to our specific protocol. Any deviations to kit components or protocols, such as using different proteins, cell/tissue lysates, or buffers (including using the same component from other commercial sources) will void any warranties on the performance of the assay kit and is not recommended.

End-users should immediately report any issues to [email protected] upon receipt of the kit, such as missing components, damaged vials, no dry ice, etc.

Scientific Category

Cell Signaling Pathway

Regulatory Status

Research Use Only

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KRAS Isoform B Coupled Nucleotide Exchange Assay Kit

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