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Conformations and structural transitions in polydeoxynucleotides.

J Pilet, J Blicharski, J Brahms

    Biochemistry
    |May 6, 1975
    PubMed
    Summary

    Different DNA sequences exhibit distinct structural forms. Alternating poly[d(A-T)] adopts an unstable A* form, while homopolymer complexes like poly(dA)-poly(dT) maintain a stable B form, influencing DNA recognition.

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    Area of Science:

    • Molecular Biology
    • Biophysics
    • Structural Biology

    Background:

    • DNA exists in various structural forms, including A and B forms, influenced by base sequence and hydration.
    • Understanding these conformational transitions is crucial for comprehending DNA-protein interactions and biological functions.

    Purpose of the Study:

    • To investigate the conformational differences between alternating polydeoxynucleotides and double-stranded homopolymer complexes.
    • To elucidate the factors governing DNA structural transitions, specifically the B to A form change.

    Main Methods:

    • Infrared linear dichroism was employed to analyze the secondary structures of various synthetic polydeoxynucleotides and crab satellite DNA.
    • Conformational analysis was performed under varying humidity conditions to study structural transitions.

    Main Results:

    • Alternating poly[d(A-T)] adopts a less stable A* form at low humidity, distinct from the typical A form of DNA.
    • Homopolymer complexes, poly(dA)-poly(dT) and poly(dI)-poly(dC), resist the B to A transition, maintaining a stable modified B form.
    • AT-rich sequences and crab satellite DNA exhibit a modified B form at high humidity, with unique phosphate group orientation.

    Conclusions:

    • Homopolymer sequences (dA)-homo(dT) appear to inhibit the B to A structural transition.
    • The observed conformational differences are not attributable to base-pairing geometry but rather sequence-dependent structural preferences.
    • Specific DNA sequences may play a role in modulating DNA structure and influencing protein recognition.

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