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SRP0246 Sigma

LKB1/MO25/STRAD Active human

recombinant, expressed in baculovirus infected insect cells, ≥70% (SDS-PAGE)

Synonym: STK11, Serine/threonine kinase 11



Related Categories Active Kinases, Cell Biology, Cell Signaling and Neuroscience, Kinase/Phosphatase Biology, Serine/Threonine Kinase Biology,
recombinant   expressed in baculovirus infected insect cells
assay   ≥70% (SDS-PAGE)
form   aqueous solution
mol wt   mol wt 49 kDa (LKB1)
  mol wt 66 kDa (MO25)
  mol wt 74 kDa (STRAD)
NCBI accession no.   NM_000455 (STK11)
  NM_001003787 (STRAD)
  NM_016289 (MO25)
shipped in   dry ice
storage temp.   −70°C
Gene Information   human ... STK11(6794)



Useful for the study of enzyme kinetics, screening inhibitors, and selectivity profiling.

Preparation Note

Thaw on ice. Upon first thaw, briefly spin tube containing enzyme to recover full content of the tube. Aliquot enzyme into single use aliquots. Store remaining undiluted enzyme in aliquots at -70°C. Note: Enzyme is very sensitive to freeze/thaw cycles.

Physical form

Formulated in 25 mM Tris-HCl, pH 8.0, 100 mM NaCl, 0.05% Tween-20, 50% glycerol and 3 mM DTT.

Biochem/physiol Actions

Liver kinase B1 (LKB1), also known as serine/threonine kinase 11 (STK11), is a serine/threonine kinase that regulates cell polarity and functions as a tumor suppressor protein. LKB1 regulates the activity of adenosine monophosphate-activated protein kinase (AMPK), promoting the suppression of growth and proliferation under energetically unfavorable conditions. Mouse protein-25 (MO25) or calcium binding protein 39 (CAB39) is a scaffolding protein which modulates the activities of STE20 family protein kinases. The MO25a isoform is part of the LKB1 tumor suppressor complex. STE20-related kinase adaptor α (STRAD) is a pseudokinase. It forms a heterotrimeric complex with LKB1 and MO25. The LKB1/MO25/STRAD complex modulates the metabolism, proliferation and cellular polarity of human intestinal epithelial cells.

General description

The product is a complex of human Liver kinase B1 (LKB1), also known as serine/threonine kinase 11 (STK11) (GenBank Accession No. NM_000455; amino acids 2-433, with N-terminal His-tag), mouse protein- 25 (MO25) or calcium binding protein 39 (CAB39) (GenBank Accession No. NM_016289; amino acids 2-341, with N-terminal GST-tag) and STE20-related kinase adaptor alpha (STRAD) (GenBank Accession No. NM_001003787).

Price and Availability

All labs need water
Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 


Certificate of Analysis

Protocols & Articles


Oncogenes and Tumor Suppressors Reprogram Metabolism

Proliferating cells require the biosynthesis of structural components for biomass production and for genomic replication. This requires a reprogramming of the metabolic pathways to ensure nutrients s...
Keywords: Aerobic, Antitumor agents, Apoptosis, Biofiles, Cancer, Citric Acid Cycle, Degradations, Environmental, Events, Gene expression, Glycolysis, Growth factors, Metabolic Pathways, Metabolism, Metabolites, Nucleotide Synthesis, PAGE, Pentose phosphate pathway, Phosphorylations, Support

Peer-Reviewed Papers


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