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  • 1990-1994  (2)
  • 1993  (2)
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  • 1990-1994  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Nuclear quadrupole interaction of111Cd on type-1 Cu-sites in blue copper proteins (1993)
    Springer
    Hyperfine interactions 80 (1993), S. 1133-1141 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The nuclear quadrupole interaction (NQI) of111Cd substituted for Cu(II) on type-1 sites in blue copper proteins is characterized by high values of ω0 in the region of 300 Mrad/s, close to that for the catalytic zinc site in alcohol dehydrogenase. Type-1 Cu has usually two sulfur ligands and two nitrogen ligands and in some cases an oxygen ligand in either a distorted tetrahedral geometry or in a trigonal bipyramidal geometry. The near tetrahedral arrangement together with the ligand sphere containing the same number of sulfur ligands explains the value of ω0 in the blue copper proteins. The present work determined the partial NQI for methionine using the known structure of azurin. This value was then used in the angular overlap model to calculate the NQI for ascorbate oxidase the structure of which is also known and gave good agreement with experiment. NQI data for laccase and stellacyanin the structures of which are unknown, are also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567476
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    199mHg-derivatives of ascorbate oxidase and laccase: selective depletion and blocking of Cu-sites (1993)
    Springer
    Hyperfine interactions 80 (1993), S. 1127-1132 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on the199mHg nuclear quadrupole interaction (NQI) of Hg-derivatives of the blue oxidases ascorbate oxidase (AO) and laccase (LAC). For fully reconstituted enzymes, three different NQIs were observed. The assignment of these NQIs to the type-1, -2, and -3 Cusites is based on type-2 depleted AO, on blocking studies with inactive Hg prior to199mHg/carrier reconstitution, and on the population ratio observed for fully reconstituted LAC. The NQIs for both enzymes are similar, suggesting similar Cu-sites. The type-2 site is preferentially reconstituted, contrary to expectations. Neither the blocking nor the depletion is as selective as expected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567475
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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