Eight-letter DNA alphabet is accurately transcribed by a natural enzyme
All known life on Earth uses the same genetic alphabet, consisting of four letters. Now, researchers at the University of California San Diego have demonstrated that one of biology's most essential enzymes can accurately read and transcribe an expanded, eight-letter genetic alphabet. The findings provide important evidence that cells can process synthetic genetic information using their natural…
The study published in Nature Communications unveils that the enzyme RNA polymerase, crucial for reading genetic material and initiating the process of gene expression, can precisely transcribe a synthetic eight-letter DNA alphabet. This groundbreaking discovery, conducted by researchers at the University of California San Diego, opens up new avenues in synthetic biology by demonstrating that cells can effectively handle and process novel genetic information using their inherent molecular machinery.
The research specifically examined RNA polymerase from Escherichia coli (E. coli) bacteria, employing biochemical tests and high-resolution cryo-electron microscopy to visually observe how the enzyme interacts with synthetic genetic letters that are not found in nature. The findings reveal that the enzyme recognizes these synthetic bases through analogous biochemical and structural signals to those used for natural base pairs, thereby shedding light on how extended genetic information can be accurately transcribed.
Moreover, the study reports that RNA polymerase can also recognize another type of synthetic base pair that relies solely on hydrophobic interactions instead of hydrogen bonds. These insights not only enhance our understanding of how cells interpret synthetic genetic codes but also pave the way for the development of advanced diagnostic tools, targeted therapeutics, and engineered biological systems with functionalities not naturally present.
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