Changes in the Cd Spectra of Calf Thymus DNA Induced by Sequential Polypeptides in Trifluoroethanol Solutions .2.

 
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1991 (EN)
Changes in the Cd Spectra of Calf Thymus DNA Induced by Sequential Polypeptides in Trifluoroethanol Solutions .2. (EN)

Panou-Pomonis, E. (EN)

Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας (EL)
Panou-Pomonis, E. (EN)

Interactions between calf thymus DNA and (L-Arg-X-Gly)n sequential polypeptides (where X = L-Ala, Val, Leu, Ile, Nva, Nle) in trifluoroethanol: water (40:60) solutions in the salt range of 0.12-0.5 M NaCl, were studied using c.d. spectroscopy. It was found that DNA tertiary structure (psi-form) is modulated by the nature of the polypeptides (variation of X residue). The effect of the secondary structure of polypeptides on the formation of psi-DNA was also analysed. Unordered polypeptides destabilized psi-aggregates, while helical polypeptides favoured DNA tertiary structure. A loss of tertiary structure was observed in the presence of the (L-Arg-L-Val-Gly)n, which can be attributed to the ability of valine to suppress psi-type DNA. (EN)

sequential polypeptides (EN)

Πανεπιστήμιο Ιωαννίνων (EL)
University of Ioannina (EN)

Int J Biol Macromol (EN)

1991

<Go to ISI>://A1991GW72800007

Butterworth-Heinemann Ltd. (EN)



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