Bacterial enzyme’s toroidal structure dismantles collagen’s triple helix: structural biology reveals evolutionary adaptation in microbial decomposition

Indigenous knowledge systems often frame microbial decomposition as part of a reciprocal relationship with the environment, rather than a mechanistic puzzle to be solved. The Māori concept of *whakapapa* (genealogy) extends to microorganisms, recognizing their ancestral role in ecological cycles, including collagen breakdown. Traditional leather tanning practices in West Africa and South Asia, which rely on microbial fermentation, may have inadvertently selected for collagen-degrading enzymes similar to those now being studied in lab settings.

The study of collagen-degrading enzymes dates back to the 19th century, with early observations of microbial digestion in rotting leather and gelatin. The discovery of bacterial collagenases in the 1960s was pivotal for medical applications, such as treating gas gangrene, yet the toroidal structure of these enzymes remained uncharacterized until now. Historical parallels exist in the study of extremophiles, where Indigenous communities in Andean or Himalayan regions have long used microbial processes in food preservation, predating Western scientific inquiry.

Toroidal (donut-shaped) structures appear in diverse cultural and biological contexts, from traditional basket-weaving patterns in Native American cultures to the mycelial networks of fungi, which decompose collagen-rich substrates like wood. In Ayurveda, the concept of *srotas* (channels) mirrors the toroidal enzyme’s central pore, suggesting a cross-cultural recognition of cyclical, flow-based systems in nature. The enzyme’s design also parallels the *mandala* in Hindu and Buddhist traditions, symbolizing cyclical processes of creation and destruction.

The enzyme’s toroidal structure, with a central pore that threads collagen strands, represents a novel mechanism for enzymatic specificity, challenging the lock-and-key model of protein interactions. This discovery aligns with recent advances in cryo-electron microscopy, which have enabled high-resolution imaging of such complex architectures. The study’s findings could revolutionize bioengineering applications, from waste management to targeted drug delivery, by leveraging the enzyme’s precision in cleaving collagen’s triple helix.

The toroidal enzyme’s design evokes spiritual symbolism across cultures, from the ouroboros in alchemy to the circular motifs in Islamic art, representing cyclical processes of destruction and renewal. Artists and designers might draw inspiration from this structure to create biomimetic materials that mimic its efficiency in breaking down complex polymers. The enzyme’s action also resonates with the concept of *wu wei* in Taoism, where natural processes unfold without force, embodying a harmony between microbial activity and structural integrity.

This discovery opens avenues for bioengineered solutions to collagen-rich waste, such as leather and gelatin, which currently contribute to landfill methane emissions. Scenario modeling suggests that scaling microbial collagenases could reduce industrial reliance on harsh chemical treatments, aligning with circular economy principles. Future research might explore the enzyme’s potential in medical applications, such as biodegradable implants or targeted therapies for collagen-related diseases like fibrosis.

Marginalized communities, particularly those in leather-producing regions of India, Bangladesh, and sub-Saharan Africa, have long grappled with the environmental and health impacts of collagen waste. Their traditional knowledge of microbial fermentation in tanning could provide critical insights into optimizing these enzymes for industrial use. However, patenting such enzymes risks excluding these communities from the benefits of their own knowledge, echoing historical patterns of biopiracy in the Global South.