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Designing of a single gene encoding four functional proteins.
Journal of Theoretical Biology 2017 April 22
In the genomes of some organisms such as bacteriophages and bacteria, a DNA sequence is able to encode two different proteins, indicating that genetic information is compacted in DNA twice denser than in usual DNA. In theory, a DNA sequence has a maximal capacity to produce six different mRNAs, however, it is an intriguing question how many of these mRNAs are able to synthesize functional proteins. Here, we design a DNA sequence encoding four collagen-like proteins, two, (Gly-Arg-Pro)n and (Gly-Ala-Pro)n, from a sense mRNA and the other two, also (Gly-Arg-Pro)n and (Gly-Ala-Pro)n from its antisense mRNA, all of which are expected to form triple-helical structures unique to collagens. Other designs such as the combination of (Gly-Arg-Pro)n, (Gly-Val-Pro)n, (Gly-Thr-Pro)n and (Gly-Arg-Pro)n are also possible. The proposed DNA sequence is considered to contain the most compact genetic information ever created.
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