P84 Protein: A Multifunctional Regulator Spanning Nucleus, Synapses, and Beyond

P84 Protein: A Multifunctional Regulator Spanning Nucleus, Synapses, and Beyond—Powered by ANT BIO PTE. LTD.

1. Concept
P84 protein is an 84 kDa nuclear matrix component with diverse functions across eukaryotes, involved in RNA processing, transcriptional regulation, and cell proliferation control. It specifically binds the N-terminal domain of retinoblastoma protein (p110RB)—a key interaction prominent during the G1 phase of the cell cycle—potentially modulating RB’s tumor suppressor function by influencing its C-terminal conformation.

Structurally, P84 contains multiple functional domains that enable complex formation with RNA-binding proteins, participating in intranuclear RNA splicing and transport. It is ubiquitously expressed across tissues and persists throughout the cell cycle, with activity varying by cell cycle stage. Notably, P84 exists as SHPS-1 (SHP substrate-1) in the nervous system, a synaptic membrane-bound protein that interacts with CD47 to form a bidirectional signaling system. Plant homologs (e.g., maize PP84) also exist, functioning as negative regulators of drought resistance.

2. Research Frontiers
P84 protein research is advancing across cell biology, neuroscience, oncology, and plant science. A key frontier is deciphering the P84-p110RB interaction mechanism to develop small-molecule modulators for cancer therapy. In neuroscience, studies explore P84/SHPS-1-CD47 signaling in synaptic plasticity and neurodegenerative diseases (Alzheimer’s, Parkinson’s).
In plant science, CRISPR/Cas9-mediated PP84 knockout improves crop drought resistance, with applications in agricultural breeding. Future directions include analyzing cross-species evolutionary conservation of P84, developing P84-based tumor diagnostic tools, and optimizing industrial P84 fiber production for environmental and occupational health.

3. Research Significance
P84’s significance lies in its multifaceted roles across biological systems. In oncology, its interaction with RB makes it a potential diagnostic marker and therapeutic target for cancers (bladder, liver, prostate). In neuroscience, P84/SHPS-1 regulates synaptic function, offering insights into neurodegenerative disease pathogenesis.

In agriculture, plant PP84 provides a genetic target for drought-resistant crop development. Basic research clarifies core molecular mechanisms of RNA processing, transcriptional regulation, and intercellular signaling, while translational efforts advance cancer therapy, neuroprotection, and sustainable agriculture.

4. Biological Functions, Applications, and Product Support
4.1 Core Biological Functions
4.1.1 Nuclear Matrix Roles (Animal Cells)
• Binds p110RB’s N-terminal domain during G1 phase, potentially modulating RB’s tumor suppressor activity via C-terminal conformational changes.
• Forms complexes with RNA-binding proteins to regulate RNA splicing and nuclear-cytoplasmic transport.
• Ubiquitous expression with cell cycle-dependent activity, supporting cell proliferation control.
4.1.2 Synaptic Signaling (Nervous System)
• Exists as SHPS-1, localized to retinal synapses (inner/outer plexiform layers) and expressed in • photoreceptor/inner nuclear layers.
• Interacts with CD47 to form a transmembrane signaling system, regulating synaptic activity, neurotransmitter release, and neural network integration.
• Abnormal expression in neurodegenerative disease models links to synaptic dysfunction.
4.1.3 Drought Resistance Regulation (Plants)
• Plant homolog PP84 acts as a negative regulator of drought resistance in maize.
• PP84 knockout enhances drought survival via reduced leaf water loss, optimized stomatal conductance, and increased antioxidant enzyme activity.
• Regulates ABA signaling and ROS homeostasis, offering a target for drought-resistant crop breeding.
4.2 Applications Across Fields
Oncology: P84 expression differs between tumor and normal tissues, serving as a diagnostic marker. Small-molecule modulators of P84-RB interaction show potential for cancer therapy.
Neuroscience: Antibodies/peptide inhibitors targeting P84/SHPS-1-CD47 improve synaptic function in neurodegenerative disease models.
Agriculture: PP84 mutation increases maize biomass retention by >30% under drought, supporting crop breeding.
Industrial Health: P84 fiber filter bags reduce occupational pneumoconiosis risk by >60% in high-pollution industries.
4.3 How ANT BIO PTE. LTD. Supports P84 Research
ANT BIO PTE. LTD., through its sub-brand UA (specializing in recombinant proteins), provides high-quality biotinylated proteins to advance signaling and interaction studies relevant to P84’s functional networks.

Key products and applications:
Biotinylated Signaling Proteins:
UA080471 (Biotin-SMARCA4 Protein, Human): For studying transcriptional regulation and chromatin remodeling—relevant to P84’s nuclear functions.
UA080462 (Biotin-Kras[G12C] Protein, Human): Useful for exploring cancer-related signaling pathways intersecting with P84-RB regulation.
UA010833/UA010848/UA010845 (Biotinylated EphA2/MERTK/ASGR1 Proteins): Support studies on transmembrane signaling, complementing P84/SHPS-1-CD47 research.

All products are expressed in eukaryotic systems (Baculovirus-Insect Cells, HEK293) with high purity and biological activity, ensuring reliability for interaction assays, signaling pathway analysis, and drug screening.

5. Brand Mission
ANT BIO PTE. LTD. is dedicated to empowering the global life science community with high-quality, innovative biological reagents and solutions. With 15 years of antibody development experience, the company leverages advanced platforms—including recombinant antibody development (rabbit/mouse monoclonal), recombinant protein expression systems (E.coli, CHO, HEK293, Insect Cells), One-Step ELISA, and PTM Pan-Modification Antibody Platform—to deliver a comprehensive product portfolio.

Through its three specialized sub-brands—Absin (general reagents and kits), Starter (antibodies), and UA (recombinant proteins)—ANT BIO PTE. LTD. adheres to international certifications (EU 98/79/EC, ISO9001, ISO13485) and strict quality standards. The company’s mission is to accelerate scientific discovery by providing tools that enhance experimental precision, efficiency, and reproducibility. ANT BIO PTE. LTD. is committed to supporting P84 research and global efforts in oncology, neuroscience, and agriculture, ultimately advancing human health and sustainable development through interdisciplinary collaboration and innovation.

6. Related Product List

Product Code	Product Name	Product Details
UA080471	Biotin-SMARCA4 Protein, Human	Host: Human; Expression System: Baculovirus-Insect Cells; Conjugation: Unconjugated
UA080462	Biotin-Kras[G12C] Protein, Human (Load GDP/GMPPNP)	Host: Human; Expression System: E.coli; Conjugation: Unconjugated
UA010833	Biotinylated EphA2 His&Avi Tag Protein, Human	Host: Human; Expression System: HEK293
UA010848	Biotinylated MERTK/Mer Fc&Avi Tag Protein, Human	Host: Human; Expression System: HEK293
UA010845	Biotinylated ASGR1/ASGPR1 His&Avi Tag Protein, Human	Host: Human; Expression System: HEK293

7. AI Disclaimer
This article is AI-compiled and interpreted based on the original work. All intellectual property (e.g., images, data) of the original publication shall belong to the journal and the research team. For any infringement, please contact us promptly and we will take immediate action.
 
ANT BIO PTE. LTD. – Empowering Scientific Breakthroughs
At ANTBIO, we are committed to advancing life science research through high-quality, reliable reagents and comprehensive solutions. Our specialized sub-brands (Absin, Starter, UA) cover a full spectrum of research needs, from general reagents and kits to antibodies and recombinant proteins. With a focus on innovation, quality, and customer-centricity, we strive to be your trusted partner in unlocking scientific mysteries and driving medical progress. Explore our product portfolio today and elevate your research to new heights.