P Saludjian's scientific contributions
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Publications (4)
The optical rotatory dispersion of horse heart ferricytochrome c and of a ferri heme undecapeptide have been determined under various conditions. Analysis of the Soret region makes it possible to characterize three different states of ferricytochrome c. the native state (superposition of a negative and a positive Cotton effect); an intermediate sta...
Citations
... Whatever the type of lipid-protein interactions, electrostatic as in ferricytochrome c-cardiolipin, or hydrophobic as in reoxidized ferricytochrome c-cardiolipin, the circular dichroism is similar over the entire spectrum, to that of the free ferricytochrome c in the intermediate state and very different from those of ferricytochrome c in the native or denatured state. For free ferricytochrome c, the transition from the native to the intermediate state is easily achieved (increasing temperature, pH extremes, addition of external ligands) [12]. This transition does not involve a secondary structural change ; it is a result of the displacement of the sixth coordination ligand of the heme iron (side chain of methionine-80) and leads to a tertiary structural change. ...
... The spectrum of cyt c in this wavelength range contains two unambiguous markers, which describe a specific conformational states of its heme region: (i) the 695 nm band, which is characteristic for the Met80 and the heme iron bond [47,48] and (ii) the 620 nm band, of which absence or presence points to the low-spin or the high-spin states of the cyt c heme iron, respectively [49]. Changes in cyt c absorbance spectra induced by urea at pH 5 and pH 7 were significantly different from each other (Fig. 1). ...
