Recombinant Human GATA4 Protein: Production & Usage Protocol

Recombinant Human GATA4 Protein is a critical zinc-finger transcription factor reagent used to study cardiac morphogenesis, cardiomyocyte differentiation, and related gene regulatory networks in vitro and in vivo.

Product Name

Recombinant Human GATA4 Protein

SKU

rp377060

Protein Family

GATA transcription factor family (zinc-finger)

Primary Application

Cardiac development, stem cell differentiation, transcription factor studies

Recommended Storage

-80°C for long-term storage; avoid repeated freeze-thaw cycles

Host/Expression System

Refer to product datasheet for expression system details

Background and Biological Significance of GATA4

GATA4 is a member of the GATA family of zinc-finger transcription factors, which bind to the consensus DNA sequence (A/T)GATA(A/G) through two highly conserved zinc-finger domains. In humans, GATA4 plays an indispensable role in cardiac morphogenesis, cardiomyocyte survival, and the regulation of genes involved in heart development. Loss-of-function mutations in GATA4 are associated with congenital heart defects, underscoring its importance as a research target.

Beyond cardiac biology, GATA4 is implicated in gonadal development, hepatogenesis, and pancreatic cell differentiation. Recombinant Human GATA4 Protein (rp377060) provides researchers with a well-defined, ready-to-use reagent for dissecting these pathways in cell-based assays, protein–DNA interaction studies, and biochemical experiments.

Reconstitution and Storage Protocol

Upon receipt, briefly centrifuge the vial before opening to consolidate the lyophilized or liquid protein. Follow the specific reconstitution instructions provided on the product datasheet for rp377060, as buffer composition and volume may vary by lot.

• Reconstitution buffer: Use the buffer specified on the datasheet (typically sterile PBS or Tris-based buffer with carrier protein such as BSA to stabilize the protein).
• Reconstitution volume: Add the recommended volume of reconstitution buffer slowly along the wall of the vial. Do not vortex; gently pipette to mix.
• Aliquoting: Prepare single-use aliquots immediately after reconstitution to prevent activity loss from repeated freeze-thaw cycles.
• Short-term storage: Store reconstituted protein at 4°C if use is planned within 48 hours.
• Long-term storage: Store aliquots at -80°C. Avoid repeated freeze-thaw cycles, as this can significantly reduce protein activity and integrity.

Note: Always refer to the specific lot datasheet supplied with rp377060 for exact reconstitution volumes and recommended storage conditions, as formulations may be updated.

Experimental Applications and Working Concentrations

Recombinant Human GATA4 Protein is suitable for multiple research applications. The following guidance reflects general best practices for recombinant transcription factor proteins; always optimize conditions empirically for your specific assay system.

• Electrophoretic Mobility Shift Assay (EMSA): GATA4 can be used to assess DNA-binding activity to GATA consensus sequences. Typical protein concentrations range from 50–500 ng per reaction; titrate to determine optimal binding conditions.
• Protein–Protein Interaction Studies (Co-IP, Pull-down): Use at concentrations appropriate for the detection method. Include appropriate negative controls (e.g., irrelevant recombinant protein) in each experiment.
• Cell-Free Transcription Assays: Recombinant GATA4 can supplement cell-free systems to study transcriptional activation of cardiac target genes such as ANF, BNP, and alpha-MHC.
• Western Blot Standard: Use as a positive control or molecular weight marker for GATA4 detection (~50 kDa expected; confirm with datasheet).

Working concentrations should be empirically optimized. Refer to published literature and the product datasheet for starting-point recommendations specific to rp377060.

Quality Control and Handling Precautions

To ensure experimental reproducibility and data integrity when working with Recombinant Human GATA4 Protein, observe the following quality control measures and handling precautions:

• Purity verification: Confirm protein purity by SDS-PAGE prior to critical experiments. The expected purity and molecular weight are specified on the rp377060 datasheet.
• Activity testing: Where possible, include a functional activity assay (e.g., EMSA with a known GATA4 target sequence) to confirm lot-to-lot consistency.
• Carrier protein: Some formulations include BSA as a stabilizer. Account for BSA when designing protein quantification assays (Bradford or BCA) and downstream experiments.
• Sterile technique: Handle the protein under sterile conditions if it will be used in cell culture experiments. Use low-protein-binding tubes and pipette tips to minimize adsorption losses.
• Avoid detergents: Do not add SDS or other denaturing detergents unless specifically required. Denaturants will abolish native protein activity.
• Endotoxin levels: For cell-based assays, verify endotoxin levels (listed on the datasheet) are within acceptable limits to prevent confounding inflammatory responses.

Frequently asked questions

What is the recommended reconstitution buffer for Recombinant Human GATA4 Protein (rp377060)?

The recommended reconstitution buffer is specified on the product datasheet supplied with each lot of rp377060. Typically, sterile PBS or a Tris-based buffer supplemented with a carrier protein such as BSA is used to maintain protein stability. Always consult the lot-specific datasheet before reconstituting.

How should Recombinant Human GATA4 Protein be stored to maintain activity?

For long-term storage, aliquot the reconstituted protein and store at -80°C. Avoid repeated freeze-thaw cycles, as they can significantly reduce protein activity and structural integrity. If use is planned within 48 hours, the reconstituted protein may be stored at 4°C.

What experimental applications is Recombinant Human GATA4 Protein validated for?

Recombinant Human GATA4 Protein is suitable for applications including EMSA (to study DNA-binding to GATA consensus sequences), protein–protein interaction assays (Co-IP and pull-down), cell-free transcription assays, and as a positive control in Western blotting. Optimal working concentrations should be determined empirically for each application.

Why is it important to check endotoxin levels when using GATA4 protein in cell-based assays?

High endotoxin levels in recombinant protein preparations can activate Toll-like receptor 4 (TLR4) signaling in mammalian cells, triggering inflammatory responses that may confound experimental results. Verifying that endotoxin levels are within acceptable limits (as stated on the datasheet) is essential for generating reliable cell-based data.

Can Recombinant Human GATA4 Protein be used to study cardiac differentiation of stem cells?

GATA4 is a well-established transcription factor in cardiac lineage specification and cardiomyocyte differentiation. Recombinant Human GATA4 Protein may be used in biochemical and cell-free assays to study GATA4-mediated transcriptional programs relevant to cardiac differentiation. For direct cell reprogramming or overexpression experiments, researchers typically use gene delivery approaches rather than exogenous recombinant protein; consult the primary literature for appropriate experimental design.

References

1. Molkentin JD, et al. Cooperative activation of atrial natriuretic factor gene expression by GATA-4 and Nkx2-5. J Biol Chem. 1994;269(24):16967-16975.
2. Pikkarainen S, et al. GATA transcription factors in the developing and adult heart. Cardiovasc Res. 2004;63(2):196-207.
3. Ieda M, et al. Direct reprogramming of fibroblasts into functional cardiomyocytes by defined factors. Cell. 2010;142(3):375-386.

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