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Structural basis for a six nucleotide genetic alphabet.

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    Synthetic biology advances with new DNA base pairs. Expanded genetic systems now integrate nonstandard nucleobases (Z:P) into DNA, maintaining natural geometries for enzyme compatibility. This enables exploration of novel genetic sequences.

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    Area of Science:

    • Synthetic Biology
    • Molecular Biology
    • Biochemistry

    Background:

    • Natural enzymes require specific geometries for DNA replication and transcription.
    • Expanded genetic systems aim to increase the information capacity of DNA.
    • Accommodating nonstandard nucleobases within DNA duplexes is crucial for their integration with biological systems.

    Purpose of the Study:

    • To investigate the structural compatibility of novel nonstandard nucleobases (Z:P) with standard DNA duplexes.
    • To determine if these nonstandard base pairs maintain canonical geometries for natural enzyme interaction.
    • To assess the potential of these expanded genetic systems in synthetic biology.

    Main Methods:

    • Crystallography of 16-mer DNA duplexes containing Z:P base pairs.
    • Analysis of DNA helical forms (A-form and B-form).
    • Circular dichroism studies in solution.

    Main Results:

    • Z:P base pairs adopt standard Watson-Crick geometry within DNA duplexes.
    • Duplexes with Z:P pairs crystallized in both A-form and B-form, similar to natural DNA.
    • Z:P pairs showed comparable properties to G:C pairs, with slightly wider major grooves.
    • Natural polymerases can likely biosynthesize these nonstandard base pairs.

    Conclusions:

    • The Z:P base pair is structurally compatible with natural DNA forms and geometries.
    • This compatibility supports the use of expanded genetic systems with natural enzymes.
    • The GACTZP system can explore expanded sequence space, a significant advancement in synthetic biology.