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- W2138801910 abstract "Ferricytochrome c can be converted to the partially folded A-state at pH 2.2 in the presence of 1.5 M NaCl. The structure of the A-state has been studied in comparison with the native and unfolded states, using resonance Raman spectroscopy with visible and ultraviolet excitation wavelengths. Spectra obtained with 200 nm excitation show a decrease in amide II intensity consistent with loss of structure for the 50s and 70s helices. The 230-nm spectra contain information on vibrational modes of the single Trp 59 side chain and the four tyrosine side chains (Tyr 48, 67, 74, and 97). The Trp 59 modes indicate that the side chain remains in a hydrophobic environment but loses its tertiary hydrogen bond and is rotationally disordered. The tyrosine modes Y8b and Y9a show disruption of tertiary hydrogen bonding for the Tyr 48, 67, and 74 side chains. The high-wavenumber region of the 406.7-nm resonance Raman spectrum reveals a mixed spin heme iron atom, which arises from axial coordination to His 18 and a water molecule. The low-frequency spectral region reports on heme distortions and indicates a reduced degree of interaction between the heme and the polypeptide chain. A structural model for the A-state is proposed in which a folded protein subdomain, consisting of the heme and the N-terminal, C-terminal, and 60s helices, is stabilized through nonbonding interactions between helices and with the heme." @default.
- W2138801910 created "2016-06-24" @default.
- W2138801910 creator A5070326580 @default.
- W2138801910 creator A5085278738 @default.
- W2138801910 creator A5089704893 @default.
- W2138801910 date "2008-12-31" @default.
- W2138801910 modified "2023-10-13" @default.
- W2138801910 title "Secondary and tertiary structure of the A-state of cytochrome c from resonance Raman spectroscopy" @default.
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- W2138801910 doi "https://doi.org/10.1002/pro.5560040411" @default.
- W2138801910 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2143105" @default.
- W2138801910 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/7613469" @default.
- W2138801910 hasPublicationYear "2008" @default.
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