Researchers turn soil bacterial protein into potent cancer cell killer

By combining a bacterial protein with a fatty acid, the researcher Aftab Nadeem and his team have created a tumor‑killing complex that targets cancer cells and shuts down their energy production.
Photo Credit: Ingrid Söderbergh

Scientific Frontline: Extended "At a Glance" Summary: Engineered Bacterial Proteins for Colorectal Cancer Therapy

The Core Concept: Researchers have engineered a novel tumor-killing complex, designated NheA-O, by combining a naturally occurring soil bacterial protein with a fatty acid to target and destroy colorectal cancer cells.

Key Distinction/Mechanism: Unlike traditional chemotherapy, which often triggers severe side effects and tumor resistance, NheA-O bypasses standard cellular survival mechanisms. It operates as a guided molecular missile that binds to the cancer cell membrane, disrupts mitochondrial energy production, and induces ferroptosis—a fatal, lipid-based chemical reaction that permanently shuts down the cell's energy supply.

Major Frameworks/Components: 

• NheA-O Complex: An engineered synthesis of a bacterial protein and a fatty acid (oleate) specifically designed to attach to cancer cell membranes.
• Ferroptosis Induction: The triggering of a specific, non-apoptotic form of cell death driven by the accumulation of damaging lipid peroxides.
• β-catenin-GPX4 Axis Inhibition: The precise biological pathway disrupted by the NheA-O complex, which neutralizes the tumor's built-in protective and survival systems.
• Mitochondrial Disruption: The targeted collapse of the cancer cell's internal energy generation infrastructure.

Branch of Science: Molecular Biology, Oncology, Biochemistry, and Microbiology.

Future Application: The research establishes a foundational strategy for developing nature-inspired cancer therapeutics. The immediate next steps involve advancing the NheA-O protein-lipid complexes into more sophisticated biological testing environments, including intestinal organoids and in vivo mouse cancer models, to evaluate systemic safety and clinical viability.

Why It Matters: Colorectal cancer remains one of the leading causes of cancer-related mortality worldwide, heavily complicated by treatment-resistant tumors. This discovery provides a fundamentally new mechanism to break through established tumor defenses, offering a potential lifeline for patients who no longer respond to conventional chemotherapy.

NheA‑O (highlighted in magenta) binds to the cell membrane of colorectal cancer cells.
Image Credit: Aftab Nadeem

Researchers at Umeå University have turned a protein from soil bacteria into a potential new weapon against colorectal cancer. A study published in Cell Death Discovery shows how an engineered bacterial protein can trigger a unique form of cancer cell death. 

"It is like finding a new key to unlock a tumor's defenses" 

“This discovery shows that we can take proteins from naturally occurring bacteria and engineer them to attack one of the deadliest and most treatment‑resistant cancers,” says Aftab Nadeem, researcher at the Department of Molecular Biology at Umeå University and lead author of the study. “It is like finding a new key to unlock a tumor's defenses.” 

Colorectal cancer is one of the leading causes of cancer‑related deaths worldwide. Although treatments such as chemotherapy are available, they often cause severe side effects, and many tumors eventually become resistant. 

The research focuses on ferroptosis, a form of cell death caused by damaging fat‑based chemical reactions inside cancer cells. By combining a bacterial protein with a fatty acid, the researchers created a tumour‑killing complex called NheA‑O. The complex acts like a guided missile, attaching to the cancer cell membrane and disrupting the cell’s energy production in the mitochondria. 

Breaking cancer’s defenses 

What makes the discovery unique is that the complex can bypass the cancer cell’s normal survival mechanisms. In colorectal cancer, tumor cells often rely on a built‑in protective system that prevents them from dying. The study shows that NheA‑O can break through this protection and trigger the collapse of the cancer cells. 

“Without energy, the cancer cell cannot survive. We were surprised to see how efficiently NheA‑O attaches to the cancer cell and shuts down its energy supply,” says Naeem Ullah, who recently finished his position as postdoctoral researcher at the Department of Molecular Biology at Umeå University. He is the first author of the study. 

Aftab Nadeem uses a high-resolution Leica SP8 confocal microscope to observe how NheA-O (shown in green) attacks and destroys colon cancer cells.
Photo Credit: Ingrid Söderbergh

Test in more complex models 

The research was carried out using advanced biochemical methods and cell culture models of colorectal cancer. The next step will be to test the safety and effectiveness of the protein‑lipid complexes in more complex biological systems, such as intestinal organoids and mouse cancer models. 

Although clinical use is still several years away, the findings point to a new strategy for developing cancer therapies inspired by molecules found in nature. 

Published in journal: Cell Death Discovery

Title: Bacterial protein-oleate complexes induce ferroptosis-like cell death in colorectal cancer cells by disrupting cell membranes and inhibiting the β-catenin-GPX4 axis

Authors: Naeem Ullah, Abdelbasset Yabrag, Amjad Ali, and Aftab Nadeem

Source/Credit: Umeå University | Ingrid Söderbergh

Reference Number: mbio042226_01

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