The Multifaceted Biology of P84 Protein: From Nuclear Regulation to Neurobiology and Agricultural Innovation

Concept

P84 is an evolutionarily conserved protein with distinct functional isoforms across biological systems. In mammalian cells, nuclear P84 is an 84 kDa nuclear matrix protein governing RNA processing, transcription, and cell cycle progression. In the nervous system, it acts as SHPS‑1 (SIRPα), a synaptic membrane protein that regulates neural signaling via interaction with CD47. In plants, homologs such as maize PP84 serve as key regulators of drought stress responses. This multifunctionality makes P84 a high‑value target across cell biology, neuroscience, oncology, and agricultural biotechnology.

Research Frontier

Recent studies have uncovered diverse and unexpected roles of P84:

• Nuclear P84 interacts with retinoblastoma protein (p110RB) to modulate cell cycle progression and tumor suppressor function.
• Neuronal P84/SHPS‑1 forms a signaling axis with CD47 that controls synaptic localization, plasticity, and neuroprotection.
• Plant PP84 acts as a negative regulator of drought resistance, offering new gene‑editing targets for crop improvement.
• Altered P84 expression is associated with multiple cancers, supporting its potential as a diagnostic biomarker and therapeutic target.

Research Significance

Understanding P84 function advances knowledge in cell cycle control, tumorigenesis, synaptic plasticity, neuroprotection, and plant stress resilience. As a shared regulatory node across species, P84 provides unique insights into evolutionary conservation and functional divergence. It also opens new avenues for cancer diagnostics, neurodegenerative disease intervention, and drought‑resistant crop breeding.

Molecular Mechanisms & Research Applications

Nuclear P84 in Cell Biology

Nuclear P84 binds the N‑terminal domain of p110RB during G1 phase, regulates RNA splicing and transport, and modulates cell proliferation. Dysregulation contributes to cancer development, making P84 a candidate biomarker for bladder, liver, and prostate cancers.

Neuronal P84/SHPS‑1 Signaling

In the retina and central nervous system, P84/SHPS‑1 localizes to synaptic layers and forms a bidirectional signaling system with CD47. This pathway supports synaptic integrity and neuronal survival. Loss of CD47 disrupts P84 synaptic localization, linking this axis to neurodegenerative disorders.

Plant PP84 in Drought Resistance

Maize PP84 negatively regulates drought tolerance by modulating ABA signaling and ROS homeostasis. CRISPR‑mediated knockout enhances survival, water retention, and antioxidant activity, representing a promising strategy for crop improvement.

Image Position Marking

[Image Location: Electrophoresis gel of P84 protein and related products – molecular weight marker bands at 180, 130, 95, 72, 55, 43, 33, 25, 17, 10 kDa]

How ANT BIO PTE. LTD. Empowers P84 Research

ANT BIO PTE. LTD. provides fully validated, high‑performance reagents to support P84 studies in any model system:

• Recombinant Proteins (UA sub‑brand): Pure, bioactive P84, SHPS‑1, CD47, and RB proteins for in vitro binding, functional, and structural studies.
• Antibodies (STARTER sub‑brand): Highly specific antibodies against P84, p110RB, phospho‑RB, SHPS‑1, and CD47 for Western blot, IHC, IF, IP, and flow cytometry.
• Kits & General Reagents (Absin sub‑brand): ELISA kits, cell lysis buffers, nuclear extraction kits, electrophoresis reagents, and Western blot detection systems.

Our products enable consistent, publication‑quality results in protein analysis, protein–protein interaction, signaling pathway, and gene expression studies.

Brand Mission

ANT BIO PTE. LTD. is dedicated to accelerating life science discovery and translational innovation by delivering reliable, high‑quality reagents and integrated solutions to researchers worldwide.

Related Product Portfolio

• Recombinant P84 / SHPS‑1 / SIRPα protein
• Recombinant CD47 and p110RB proteins
• Anti‑P84, anti‑SHPS‑1, anti‑CD47, anti‑RB antibodies
• P84‑CD47 and P84‑RB binding ELISA kits
• Nuclear protein extraction and electrophoresis reagents
• Cell cycle and proliferation detection kits
• Plant protein research supporting reagents

Brand Promotion

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