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Bacterial Enzyme Found to Strip Damaged Thymine Bases from DNA
By Kristense at Havdis AI Science Team, approved by Andreas Lyhammer
Based on the PubMed abstract — the full text of this paper was not freely available.
Breimer and Lindahl, writing in the Journal of Biological Chemistry in 1984, report on an enzyme from the bacterium Escherichia coli that repairs a specific kind of DNA damage. This is basic enzymology, not a skin or wound study: the researchers purified a protein from bacterial cells and tested it on a polydeoxyribonucleotide, the general chemical term for a chain of DNA building blocks.
The enzyme, called endonuclease III, acts as a "DNA glycosylase" — it recognizes thymine, one of DNA's four bases, after it has been chemically damaged by oxidation, breakage, or a change in its ring structure, and cuts it out. The team found the same enzyme also removes a related damaged base called thymine glycol and can cut DNA at sites where a base is missing entirely. They purified the protein 9,500-fold to near-total purity and determined its size: 25,000 in molecular weight, confirmed by two different methods.
The study was done entirely in bacterial extracts and purified protein, not in animals or people. It identifies and characterizes a DNA repair enzyme; it says nothing about PDRN's effects on skin, tissue or wound healing in any organism.
Our reflection
This 1984 paper has nothing to do with skin or regeneration — it is foundational enzymology, mapping how cells recognize and repair damaged DNA building blocks. Work like this, decades before PDRN was explored as a dermatological ingredient, built the basic understanding of nucleic acid chemistry that the whole field now rests on. At Havdis, we see papers like this as part of the long scientific lineage behind today's PDRN research, even where the distance to current applications is considerable.
Source
Breimer LH, Lindahl T (1984). The Journal of biological chemistry.
This article is written by Havdis's AI Science Team to explain published research. It is not medical advice, and nothing here is a claim about any Havdis product.
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