ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1432-1327
    Keywords: Key words Ferredoxin ; Iron-sulfur clusters ; NMR ; Hyperfine shifts ; Magnetic interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract  The oxidized Fe7S8 ferredoxin from Bacillus schlegelii, containing both [Fe3S4]+ and [Fe4S4]2+ clusters, has been investigated by 1H NMR spectroscopy. An extensive sequence-specific assignment of the hyperfine-shifted resonances has been obtained by making use of a computer-generated structural model. The pattern and the temperature dependence of the hyperfine shifts of the β-CH2 protons of the cysteines coordinating the [Fe3S4]+ cluster are rationalized in terms of magnetic interactions between the iron ions. The same approach holds for the hyperfine coupling with 57Fe. It is shown that the magnetic interactions are more asymmetric in Fe7S8 ferredoxins than in Fe3S4 ferredoxins. The NMR non-observability of the β-CH2 protons of coordinated cysteines in the one-electron-reduced form has been discussed.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1572-8773
    Keywords: Copper ; Cobalt ; Nickel ; Superoxide dismutase ; Alkaline phosphatase ; NMR ; Relaxometry ; Nuclear relaxation ; Electronic relaxation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary The water-proton nuclear-magnetic-relaxation dispersion profiles have been analyzed for Cu2Zn2-superoxide dismutase (SOD) and Cu2-alkaline phosphatase (AP). The electronic relaxation times are derived, together with structural information. The effect of magnetic coupling with another copper ion in Cu2Cu2SOD and Cu2Cu2AP is discussed. It is shown that the electronic relaxation times of copper(II) essentially do not change. The opposite happens with Cu2Co2SOD, Cu2Co2AP and Cu2Ni2SOD in which fast-relaxing metal ions provide relaxation mechanisms for copper(II) as well. In these cases the systems can be studied through high-resolution NMR spectroscopy.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...