What Is GK5 and Why Does It Matter?

GK5, also known as germinal center kinase 5 (GCK-V) or MAP4K5, is a member of the mammalian sterile-20 (STE20)-like serine/threonine kinase superfamily, specifically classified within the MAP4K (mitogen-activated protein kinase kinase kinase kinase) subgroup. These kinases serve as upstream regulators in mitogen-activated protein kinase (MAPK) signaling cascades, particularly in stress-response and apoptotic pathways.

GK5 contains a characteristic N-terminal kinase catalytic domain and a C-terminal regulatory region. By phosphorylating downstream substrates, GK5 participates in the modulation of cellular responses to extracellular stimuli, including cytokines and environmental stressors. Understanding GK5 function is relevant to research areas such as immune cell signaling, apoptosis regulation, and potentially cancer biology.

Biochemical Properties of Recombinant Human GK5 Protein

Recombinant Human GK5 Protein (SKU: rp367952) is produced using recombinant DNA technology to yield a well-defined, reproducible kinase reagent suitable for in vitro research applications. As a recombinant protein, it enables researchers to study GK5 enzymatic activity, substrate specificity, and inhibitor interactions under controlled laboratory conditions.

Key biochemical attributes include its serine/threonine kinase activity, dependence on ATP as a phosphate donor, and the requirement for divalent cations (such as Mg²⁺ or Mn²⁺) as cofactors for catalytic activity — properties common to the MAP4K family. Researchers should consult the official product datasheet (referenced as absea#PP-9164) for confirmed molecular weight, purity specifications, formulation details, and recommended reconstitution buffers, as these parameters are critical for experimental reproducibility.

Research Applications

Recombinant Human GK5 Protein is suitable for a range of in vitro biochemical and cell biology research applications, including:

• Kinase activity assays: Measuring phosphorylation of specific peptide or protein substrates to characterize GK5 enzymatic function and determine kinetic parameters.
• Inhibitor screening: Evaluating small-molecule inhibitors for selectivity and potency against GK5 in drug discovery pipelines targeting MAPK-related pathways.
• Protein–protein interaction studies: Identifying binding partners within the MAP4K signaling network using pull-down or co-immunoprecipitation approaches with recombinant GK5 as bait.
• Structural biology: Supporting crystallography or cryo-EM studies to elucidate GK5 three-dimensional structure and catalytic mechanism.
• Antibody validation: Serving as a positive control antigen for validating anti-GK5 antibodies used in Western blot, ELISA, or immunofluorescence experiments.

Always refer to the product datasheet for validated application-specific conditions and recommended concentrations.

Handling, Storage, and Quality Considerations

To maintain the activity and integrity of Recombinant Human GK5 Protein, researchers should observe the following general best practices for recombinant kinase proteins:

• Storage: Store at the temperature specified on the product datasheet (typically −20 °C or −80 °C for long-term storage). Avoid repeated freeze–thaw cycles, which can reduce kinase activity.
• Reconstitution: Follow the datasheet instructions for reconstitution buffer composition and protein concentration to ensure optimal solubility and activity.
• Aliquoting: Prepare single-use aliquots upon first thaw to minimize activity loss.
• Assay conditions: Include appropriate positive and negative controls in all kinase assays to ensure data quality and experimental reproducibility.

Specific purity, formulation, and quality-control data (e.g., SDS-PAGE, activity verification) are provided in the official product datasheet. Contact Aladdin Scientific technical support for application-specific guidance.