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Optical studies on complexes between DNA and pseudoisocyanine.

B Nordén

    Biophysical Chemistry
    |December 1, 1976
    PubMed
    Summary

    Linear dichroism (LD) reveals two distinct pseudoisocyanine (PIC) binding modes to DNA. Monomeric PIC intercalates strongly, while dimeric and polymeric PIC bind electrostatically, forming helical structures.

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    Area of Science:

    • Biophysics
    • Molecular Biology
    • Spectroscopy

    Background:

    • Linear dichroism (LD) is a spectroscopic technique.
    • Pseudoisocyanine (PIC) is a cyanine dye.
    • DNA is a nucleic acid polymer.

    Purpose of the Study:

    • To investigate the binding of pseudoisocyanine (PIC) to DNA using linear dichroism (LD).
    • To characterize the stoichiometry and structure of PIC-DNA complexes.
    • To distinguish between different binding modes of PIC to DNA.

    Main Methods:

    • Linear dichroism (LD) spectroscopy.
    • Circular dichroism (CD) spectroscopy.
    • Flow-oriented DNA samples.

    Main Results:

    • Two distinct PIC-DNA complexes were identified: a strong, intercalation complex with monomeric PIC and weaker, electrostatic complexes with dimeric and polymeric PIC.
    • Dimeric PIC likely binds via an intercalated monomer as a secondary site.
    • Polymeric PIC forms a right-handed helical array with a sharp absorption band at 553 nm, polarized parallel to the DNA axis.

    Conclusions:

    • LD and CD spectroscopy can distinguish between different modes of PIC binding to DNA.
    • The structure of polymeric PIC-DNA complexes involves helical arrangements.
    • Polymeric PIC, including "Scheibe polymer," interacts with DNA, forming aggregates that can be degraded by flow force.

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