Recombinant Human GLI4 Protein: Handling & Usage Protocol

Recombinant Human GLI4 Protein is a zinc finger transcription factor involved in the Hedgehog signaling pathway, produced recombinantly for use in biochemical, cell-based, and structural biology research applications.

Product Name

Recombinant Human GLI4 Protein

SKU

rp369356

Protein Family

GLI family zinc finger transcription factors

Biological Role

Transcriptional regulator in the Hedgehog signaling pathway

Source Organism

Human (Homo sapiens)

Application

Biochemical assays, protein interaction studies, transcription factor research

Background and Biological Significance of GLI4

GLI4 (GLI Family Zinc Finger 4) is a member of the GLI family of Krüppel-like zinc finger transcription factors, which serve as downstream effectors of the Hedgehog (Hh) signaling pathway. The Hedgehog pathway plays critical roles in embryonic development, tissue patterning, stem cell maintenance, and has been implicated in various cancers when dysregulated.

GLI4 contains multiple C2H2-type zinc finger domains that mediate sequence-specific DNA binding. Although GLI4 is the least studied member of the GLI family compared to GLI1, GLI2, and GLI3, emerging research suggests it may participate in transcriptional regulatory networks relevant to development and oncogenesis. Recombinant Human GLI4 Protein enables researchers to investigate its biochemical properties, binding partners, and transcriptional activities in controlled in vitro systems.

Reconstitution and Storage Instructions

Reconstitution: Briefly centrifuge the vial prior to opening to pellet any lyophilized material that may have adhered to the cap or sides. Reconstitute the protein in sterile, high-purity water or an appropriate buffer (e.g., phosphate-buffered saline, pH 7.4, supplemented with a carrier protein such as 0.1% BSA to enhance stability) to a working concentration suitable for your assay. Allow the reconstituted solution to equilibrate at room temperature for 5–10 minutes with gentle mixing. Avoid vigorous vortexing, which may cause protein denaturation.

Storage: Store the lyophilized protein at –20°C or –80°C upon receipt. Once reconstituted, prepare single-use aliquots to minimize repeated freeze-thaw cycles, which can reduce activity and increase aggregation. Reconstituted protein should be stored at –80°C for long-term use or at 4°C for short-term use (typically within 1 week). Refer to the specific Certificate of Analysis (CoA) supplied with your lot for confirmed storage conditions and expiry.

Note: Specific reconstitution volumes, buffer compositions, and stability data should be confirmed against the product-specific CoA. Flag for supplier verification if not provided.

Experimental Applications and Assay Guidelines

Recombinant Human GLI4 Protein is suitable for a range of in vitro research applications, including but not limited to:

• Protein–Protein Interaction Studies: GLI4 can be used as bait or prey in pull-down assays, co-immunoprecipitation experiments, or surface plasmon resonance (SPR) to identify and characterize binding partners within the Hedgehog signaling cascade.
• Electrophoretic Mobility Shift Assays (EMSA): The zinc finger DNA-binding domains of GLI4 make it amenable to EMSA experiments to characterize its DNA-binding specificity and affinity for GLI-consensus sequences.
• Biochemical Activity Assays: Recombinant GLI4 can be used to study post-translational modifications, enzymatic processing, or as a substrate/target in kinase or ubiquitination assays relevant to Hedgehog pathway regulation.
• Antibody Validation: The protein can serve as a positive control antigen for validating GLI4-specific antibodies in Western blot, ELISA, or immunofluorescence workflows.

Optimal working concentrations should be determined empirically for each assay system. Include appropriate positive and negative controls in all experiments.

Quality Control and Purity Considerations

Recombinant Human GLI4 Protein from Aladdin Scientific (rp369356) is manufactured under controlled conditions to ensure consistent lot-to-lot quality. Key quality attributes typically assessed for recombinant proteins include:

• Purity: Assessed by SDS-PAGE and/or HPLC; confirm purity percentage from the CoA supplied with your specific lot.
• Identity: Confirmed by mass spectrometry or N-terminal sequencing to verify the correct amino acid sequence of the expressed GLI4 construct.
• Endotoxin Level: Determined by Limulus Amebocyte Lysate (LAL) assay; low endotoxin is essential for cell-based assays to prevent confounding inflammatory responses.
• Biological Activity: Where applicable, functional assays may be used to confirm the protein adopts its correct fold and is capable of relevant interactions.

Always review the CoA accompanying each lot before use. If specific quality data are required and not provided, contact Aladdin Scientific technical support for additional documentation.

Safety, Handling Precautions, and Disposal

General Precautions: Recombinant Human GLI4 Protein is intended for research use only (RUO) and is not approved for diagnostic, therapeutic, or veterinary use. Handle all recombinant proteins using standard laboratory biosafety practices appropriate for Biosafety Level 1 (BSL-1) reagents, unless otherwise indicated by your institutional biosafety officer.

Personal Protective Equipment (PPE): Wear appropriate PPE including laboratory coat, gloves, and eye protection when handling this protein. Avoid skin and eye contact with the reconstituted solution.

Disposal: Dispose of all protein solutions and contaminated materials in accordance with local, institutional, and national regulations governing biological and chemical waste. Autoclave or treat with appropriate disinfectant before disposal if required by your institution.

Spill Management: In the event of a spill, absorb the solution with an appropriate absorbent material and decontaminate the affected area with a suitable disinfectant (e.g., 70% ethanol or 10% bleach).

Frequently asked questions

What is the recommended reconstitution buffer for Recombinant Human GLI4 Protein?

Sterile phosphate-buffered saline (PBS, pH 7.4) supplemented with a carrier protein such as 0.1% BSA is generally recommended to maintain protein stability and minimize adsorption to tube surfaces. Always refer to the Certificate of Analysis (CoA) provided with your specific lot for confirmed reconstitution instructions, as conditions may vary by formulation.

How should I store Recombinant Human GLI4 Protein to maintain activity?

The lyophilized protein should be stored at –20°C or –80°C. After reconstitution, aliquot the protein into single-use volumes and store at –80°C for long-term use. Avoid repeated freeze-thaw cycles, as these can lead to loss of protein activity and increased aggregation. Short-term storage at 4°C (up to 1 week) is acceptable for actively ongoing experiments.

What applications is Recombinant Human GLI4 Protein validated for?

Recombinant Human GLI4 Protein is suitable for use in protein–protein interaction studies, electrophoretic mobility shift assays (EMSA) to assess DNA-binding activity, biochemical assays investigating post-translational modifications, and as a positive control antigen for antibody validation workflows including Western blot and ELISA. Optimal concentrations should be determined empirically for each application; consult the CoA for any application-specific validation data.

Is Recombinant Human GLI4 Protein suitable for cell-based assays?

Recombinant GLI4 Protein may be used in cell-based assay contexts; however, endotoxin levels must be confirmed to be sufficiently low to avoid confounding inflammatory responses in cell culture. Check the endotoxin specification on the CoA and perform appropriate controls. For intracellular applications, a delivery reagent or transfection strategy may be required.

Who should I contact if I have technical questions about this product?

For technical support regarding Recombinant Human GLI4 Protein (rp369356), please contact the Aladdin Scientific technical support team via the contact information provided on the Aladdin Scientific website. Our technical team can assist with reconstitution guidance, application optimization, and documentation requests such as additional CoA or safety data sheets.

References

1. Ruiz i Altaba A, Sánchez P, Dahmane N. Gli and hedgehog in cancer: tumours, embryos and stem cells. Nat Rev Cancer. 2002;2(5):361–372. doi:10.1038/nrc803
2. Hui CC, Angers S. Gli proteins in development and disease. Annu Rev Cell Dev Biol. 2011;27:513–537. doi:10.1146/annurev-cellbio-092910-154048
3. Ingham PW, McMahon AP. Hedgehog signaling in animal development: paradigms and principles. Genes Dev. 2001;15(23):3059–3087. doi:10.1101/gad.938601

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.