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The magnetic properties of the haem groups of Pseudomonas cytochrome oxidase and its cyanide-bound derivatives were studied in both the oxidized and reduced states by means of m.c.d. (magnetic circular dichroism) at low temperatures. In addition, the oxidized forms of the enzyme were also investigated by e.p.r. (electron-paramagnetic-resonance) spectroscopy, and a parallel study, using both e.p.r. and m.c.d., was made on Pseudomonas cytochrome c-551 to aid spectral assignments. For ascorbate-reduced Pseudomonas cytochrome oxidase, the temperature-independence of those features in the m.c.d. spectrum corresponding to the haem c, and the temperature-dependence of those signals corresponding to the haem d1, showed the former to be low-spin and the latter to be high-spin (s = 2). However, addition of cyanide to the reduced enzyme gave a form of the protein that was completely low-spin. The e.p.r. and m.c.d. sectra of oxidized Pseudomonas cytochrome oxidase and its cyanide derivative were consistent with the haem c and d1 components being low-spin in both cases. Pseudomonas cytochrome c-551 was found to be low-spin in both its oxidized and reduced redox states.
T A Walsh, and
M K Johnson, and
C Greenwood, and
D Barber, and
J P Springall, and
A J Thomson
February 1973,
Biochimica et biophysica acta,
T A Walsh, and
M K Johnson, and
C Greenwood, and
D Barber, and
J P Springall, and
A J Thomson
May 1962,
Nature,
T A Walsh, and
M K Johnson, and
C Greenwood, and
D Barber, and
J P Springall, and
A J Thomson
April 1980,
FEBS letters,
T A Walsh, and
M K Johnson, and
C Greenwood, and
D Barber, and
J P Springall, and
A J Thomson
August 1976,
The Biochemical journal,
T A Walsh, and
M K Johnson, and
C Greenwood, and
D Barber, and
J P Springall, and
A J Thomson
August 1958,
Biochimica et biophysica acta,
T A Walsh, and
M K Johnson, and
C Greenwood, and
D Barber, and
J P Springall, and
A J Thomson
December 1979,
The Biochemical journal,
T A Walsh, and
M K Johnson, and
C Greenwood, and
D Barber, and
J P Springall, and
A J Thomson
October 1972,
The Journal of biological chemistry,
T A Walsh, and
M K Johnson, and
C Greenwood, and
D Barber, and
J P Springall, and
A J Thomson
March 1961,
The Journal of biological chemistry,
T A Walsh, and
M K Johnson, and
C Greenwood, and
D Barber, and
J P Springall, and
A J Thomson
March 1981,
The Journal of biological chemistry,
T A Walsh, and
M K Johnson, and
C Greenwood, and
D Barber, and
J P Springall, and
A J Thomson
March 1963,
Biochimica et biophysica acta,
