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Consider an instance when a child with eczema scrapes a skin spot that is itchy. Invisible to the naked sight, a small hole appears. Common bacteria Staphylococcus aureus infiltrates that gap.
Numerous individuals would not be harmed by the bacteria. But in a person with a compromised skin barrier, the microbe might adhere firmly, grow, and cause an illness that is hard to treat. Staph may extend beyond the skin and prove fatal in extreme circumstances.
MRSA and other resistant strains transform what should be a manageable illness into a medical crisis that kills tens of thousands of people annually in the US alone.
Why staph bacteria adhere so strongly to human skin has been a long-standing mystery to scientists.
The solution was found in a recent study that was co-led by the physics department at Auburn University and included researchers from Belgium and the UK. According to study published in Science Advances, staph has a biological grasp that is almost unrivaled in nature and more powerful than superglue, locking onto human skin.
The key finding is that the bacteria attaches itself to a human protein called desmoglein-1 using a bacterial protein called SdrD as a grappling hook.
The two have an attraction that has never been seen before. It resists forces so strong that they are comparable to the strength of some chemical bonds. This explains why staph bacteria cling to the skin even after being scratched, cleaned, or perspired.
The most powerful non-covalent protein-protein interaction ever discovered has been this one according to the researchers.
This helps us understand why staph infections are so hard to eradicate and explains why they are so persistent.
The research also showed that calcium, which is more often associated with bone durability, is essential for enhancing this bacterial grip. In lab tests, the link between SdrD and desmoglein-1 diminished considerably when calcium levels were lowered.
Reintroducing calcium strengthened the connection even further. Patients with eczema, whose skin’s calcium balance is disturbed, should pay particular consideration to this result. These unstable levels may instead strengthen Staph’s grip on the skin rather than shield it.
The degree to which calcium enhanced the potency of this connection shocked the researchers.
In addition to stabilizing the bacterial protein, it increased the complex’s overall resistance to breaking.
This finding provides novel opportunities for fighting illnesses resistant to antibiotics. Rather of attempting to eradicate bacteria directly, which frequently leads to the development of resistance, researchers might create treatments that prevent or reduce bacterial adhesion. Staph is more likely to be removed by the immune system before infection takes hold if it is unable to adhere to the skin.
Discovering the strongest protein connection in nature not only raises the bar for biophysics but also offers a novel approach to defeating one of the most difficult diseases in medicine.
Sources:
Constance Chantraine et al. (2025). Ultra-Strong Staphylococcus aureus Adhesion to Human Skin: Calcium as a Key Regulator of Non-Covalent Interactions, Science Advances. DOI: 10.1126/sciadv.adu7457. www.science.org/doi/10.1126/sciadv.adu7457
The cling of doom: How staph bacteria latch onto human skin. https://phys.org/news/2025-09-doom-staph-bacteria-latch-human.html
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