PFK Enzyme Dual Role in Metabolism and Cell Cycle

Key Highlights

• Phosphofructokinase (PFK Enzyme) shows a dual role beyond glycolysis
• The Pfk2 subunit binds and unwinds mRNA, influencing protein synthesis
• Direct link identified between cellular metabolism and cell cycle progression
• Findings may reshape understanding of cell proliferation and disease pathways

How Does the PFK Enzyme Regulate Cell Division Beyond Metabolism?

A new study led by the University of Surrey reveals that the well-known metabolic enzyme phosphofructokinase (PFK) plays a second, unexpected role in regulating cell division. Traditionally recognized as a key regulator of glycolysis, PFK has now been shown to influence cell cycle progression through RNA interaction.

In Saccharomyces cerevisiae, the PFK Enzyme consists of two subunits, Pfk1 and Pfk2. While both contribute to energy metabolism, researchers discovered that Pfk2 functions independently as an RNA-binding protein, interacting with more than 800 messenger RNAs (mRNAs). Notably, Pfk2 can unwind double-stranded RNA, a property typically associated with RNA helicases.

What Happens When Pfk2 Function Is Disrupted?

Experimental findings demonstrated that yeast cells lacking Pfk2 exhibited delayed growth, increased cell size, and impaired transition from G1 to S phase—a critical checkpoint in cell division.

Further analysis using polysome profiling revealed reduced translation of key regulatory proteins, such as:

• CLN3 (G1 cyclin initiating cell division)
• BUB3 (spindle checkpoint regulator)

Importantly, restoring a glycolysis-deficient version of Pfk2 reversed these defects. This confirms that Pfk2’s role in cell cycle regulation is independent of its metabolic function.

A Molecular Relay Between Energy Status and Cell Proliferation

The study proposes a “molecular relay switch” model:

• Under low-energy conditions, the PFK enzyme prioritizes glycolysis
• Under high energy availability, Pfk2 shifts to an RNA-regulatory role, promoting translation of cell cycle genes

This dual functionality establishes a direct mechanistic link between metabolism and cell proliferation, offering new insights into diseases characterized by dysregulated cell growth, including cancer.

For healthcare professionals and researchers, these findings highlight a critical paradigm shift: metabolic enzymes may have hidden regulatory roles impacting gene expression and cell division.

Why This Matters for Clinical Research and Therapeutics

Understanding the dual role of PFK could influence future research in:

• Cancer biology and tumor progression
• Targeted therapies regulating cell cycle control
• Metabolic disorders with proliferative components

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This discovery opens the door to exploring non-canonical functions of enzymes, potentially identifying new therapeutic targets in oncology and molecular medicine.

Source:

University of Surrey