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Related Experiment Videos

[Structure of polyriboguanylic acid in solution]

E A Lesnik, I M Kochkina, A S Tikhonenko

    Molekuliarnaia Biologiia
    |July 1, 1980
    PubMed
    Summary

    Poly(G) transitions from a metastable globular form to a stable linear form. This involves four-stranded poly(G) fibers forming through molecular joining, revealing structural defects and adaptability.

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    The Journal of biological chemistry·1997

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Materials Science

    Background:

    • Poly(G) exhibits complex structural transitions.
    • Understanding these transitions is crucial for biomaterials and genetic research.

    Purpose of the Study:

    • To investigate the structural transformation of poly(G) from a metastable to a stable form.
    • To elucidate the mechanism of four-stranded poly(G) fiber formation and its structural characteristics.

    Main Methods:

    • Electron microscopy
    • Circular Dichroism (CD) spectroscopy
    • Analysis of freeze-dried poly(G) preparations

    Main Results:

    • Identified the transition as a change from globular to linear four-stranded poly(G).
    • Observed the formation of long poly(G) fibers (4-5 nm diameter, 200-2000 nm length) via noncovalent end-joining.
    • Detected double-stranded regions (2-3 nm diameter) as defects within four-stranded fibers.
    • Demonstrated fiber breakdown into two-stranded structures under specific conditions (high temperature, low pH).

    Conclusions:

    • The study reveals the mechanism of poly(G) fiber assembly and structural dynamics.
    • Poly(G) fiber stability and structure are condition-dependent, influencing hydrogen bonding patterns.

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