Recombinant Human HP1BP3 Protein: Handling & Usage Protocol

Recombinant Human HP1BP3 Protein is a research-grade chromatin-associated protein designed to support investigations into heterochromatin organization, gene silencing, and epigenetic regulatory mechanisms.

Product Name

Recombinant Human HP1BP3 Protein

SKU

rp371635

Species Origin

Human (Homo sapiens)

Protein Class

Chromatin-associated / Heterochromatin binding protein

Application

Chromatin biology, epigenetics, gene regulation research

Format

Recombinant protein (lyophilized or liquid; confirm with datasheet)

Storage

Store at -20°C or -80°C; avoid repeated freeze-thaw cycles (confirm with datasheet)

Background: HP1BP3 and Its Biological Role

HP1BP3 (Heterochromatin Protein 1 Binding Protein 3) is a nuclear protein that associates with heterochromatin protein 1 (HP1) family members, playing a critical role in chromatin compaction, gene silencing, and maintenance of heterochromatin structure. It contains chromobox-interacting domains that facilitate its recruitment to HP1-enriched genomic regions, thereby contributing to transcriptional repression and genome stability.

HP1BP3 has been implicated in processes including cellular senescence, DNA damage response, and regulation of repetitive elements within the genome. Its interaction with HP1 isoforms (HP1α, HP1β, HP1γ) positions it as a key scaffold protein within higher-order chromatin architecture. Research into HP1BP3 function is relevant to cancer biology, aging, and epigenetic inheritance.

Reconstitution and Handling Procedure

Materials Required: Sterile deionized water or reconstitution buffer as specified in the product datasheet, low-binding microcentrifuge tubes, ice, and pipettes.

1. Equilibrate: Allow the vial to equilibrate to room temperature (approximately 15–25°C) for 10–15 minutes before opening to minimize condensation-related contamination.
2. Reconstitute: Add the volume of sterile deionized water or the recommended buffer (as indicated on the product-specific datasheet) directly to the lyophilized cake. Gently pipette up and down; do not vortex vigorously.
3. Dissolve: Allow the solution to stand on ice for 5–10 minutes, then gently mix by inversion or slow rotation until fully dissolved.
4. Centrifuge: Briefly centrifuge (1,000–2,000 × g, 30 seconds) to collect all material from the vial walls.
5. Aliquot: Prepare single-use aliquots to avoid repeated freeze-thaw cycles, which can compromise protein activity and integrity.

Note: Always consult the product-specific datasheet supplied with SKU rp371635 for definitive reconstitution volume, buffer composition, and concentration specifications.

Storage and Stability Guidelines

Short-term storage (up to 1 month): Store reconstituted protein at 4°C if the entire volume will be used within one month. Addition of a carrier protein such as 0.1% BSA may enhance stability during short-term refrigerated storage.

Long-term storage: For extended storage, freeze aliquots at -20°C or preferably -80°C. Lyophilized protein, if stored desiccated at -20°C, may be stable for 12 months or more from the date of manufacture.

Avoid:

• Repeated freeze-thaw cycles (limit to ≤3 cycles maximum).
• Exposure to direct light, which can degrade sensitive protein epitopes.
• Storage at room temperature for extended periods.

Disclaimer: Confirm exact stability data and expiry information with the certificate of analysis (CoA) provided with rp371635.

Recommended Applications and Experimental Tips

Recombinant Human HP1BP3 Protein is suitable for use in a range of in vitro and biochemical research applications, including but not limited to:

• Protein–protein interaction studies: Co-immunoprecipitation (Co-IP) or pull-down assays to map interactions between HP1BP3 and HP1 family members or other chromatin-associated partners.
• Biochemical assays: ELISA-based binding assays, surface plasmon resonance (SPR), or isothermal titration calorimetry (ITC) to characterize binding affinities.
• In vitro chromatin assembly: Reconstitution of chromatin complexes to study the role of HP1BP3 in higher-order chromatin folding.
• Antibody validation: Use as a positive control antigen for Western blot, dot blot, or ELISA when validating HP1BP3-specific antibodies.
• Functional enzyme or activity assays: Investigating the effect of HP1BP3 on chromatin remodeling complexes in cell-free systems.

Tip: Optimize protein concentration empirically for each assay format. Start with a concentration range of 0.1–1 µg per reaction and titrate accordingly. Confirm suitability of the protein for each specific application in your experimental system.

Quality Control and Purity Considerations

Recombinant Human HP1BP3 Protein (rp371635) is manufactured under controlled conditions and subjected to quality control testing prior to release. Typical quality assessments for recombinant proteins of this class may include:

• Purity analysis: SDS-PAGE with Coomassie staining or silver staining to assess purity (typical target ≥85–95%; confirm with CoA).
• Identity verification: Western blot using an HP1BP3-specific antibody or mass spectrometry confirmation.
• Endotoxin testing: LAL (Limulus Amebocyte Lysate) assay to confirm endotoxin levels are within acceptable limits for cell-based assays.
• Bioactivity testing: Functional assays confirming binding to HP1 family proteins or chromatin substrates where applicable.

Always refer to the Certificate of Analysis (CoA) provided with each lot of rp371635 for actual measured values. Reported QC data may vary by lot.

Frequently asked questions

What is the recommended reconstitution buffer for Recombinant Human HP1BP3 Protein?

The reconstitution buffer and volume are specified in the product datasheet accompanying SKU rp371635. As a general guideline for recombinant nuclear proteins, sterile deionized water or a physiological buffer (e.g., PBS pH 7.4) is commonly used. Always follow the product-specific datasheet for definitive instructions.

How should I store Recombinant Human HP1BP3 Protein to maintain its activity?

For long-term storage, aliquot the protein and store at -80°C to avoid repeated freeze-thaw cycles. For short-term use within one month, storage at 4°C with a carrier protein (e.g., 0.1% BSA) is acceptable. Refer to the Certificate of Analysis (CoA) for lot-specific stability data.

What applications is Recombinant Human HP1BP3 Protein validated for?

Recombinant Human HP1BP3 Protein is suitable for protein–protein interaction studies (Co-IP, pull-down), ELISA-based binding assays, in vitro chromatin assembly, and antibody validation as a positive control antigen. Confirm specific application suitability with the product datasheet for rp371635.

How many freeze-thaw cycles can Recombinant Human HP1BP3 Protein tolerate?

It is generally recommended to limit freeze-thaw cycles to no more than three for recombinant proteins. To minimize degradation, prepare single-use aliquots at the time of reconstitution. Exceeding the recommended number of freeze-thaw cycles may result in reduced protein activity or aggregation.

Can Recombinant Human HP1BP3 Protein be used in cell-based assays?

Use in cell-based assays depends on endotoxin levels and protein purity, both of which are specified in the product CoA. If endotoxin levels are within acceptable limits and the protein formulation is suitable, cell-free functional assays and potentially cell-based experiments may be feasible. Verify suitability with the lot-specific CoA and datasheet for rp371635.

References

1. Lomberk G, Wallrath L, Urrutia R. The Heterochromatin Protein 1 family. Genome Biology. 2006;7(7):228. doi:10.1186/gb-2006-7-7-228
2. Cholewa-Waclaw J, et al. The role of epigenetic mechanisms in the regulation of gene expression in the nervous system. Journal of Neuroscience. 2016;36(45):11427-11434.
3. Aladdin Scientific. Product Datasheet: Recombinant Human HP1BP3 Protein, SKU rp371635. Aladdin Scientific.

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