Polarographic catalytic currents produced by cytochromes c in ammoniacal buffers containing cobalt ions. I. Significance of heme group.

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概要

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• Polarographic behavior of the Brdicka current (catalytic current produced by proteins in ammoniacal buffers containing cobalt ions) of cytochromes c from five sources (horse, chicken, and tuna hearts, <I>C. krusei</I> and <I>S. cerevisiae</I>) and of modified horse cytochromes (metal-substituted, metal-free, and heme-free cytochrome, and carboxymethylated cytochrome at methionyl residues) was investigated at dme and hmde. The results indicate that the heme group and its sixth ligand are important in determining the Brdicka current-activity of cytochromes c. Replacement of the sixth heme ligand from Met to Lys reduced the Brdicka current-activity by about onehalf. Brdicka current of <I>D. vulgaris</I> cytochrome c<SUB>3</SUB> was interpreted as due to four Lys-liganded heme groups.

• 公益社団法人 日本化学会の論文

著者

• Ikeda Tokuji

  Department Of Agricultural Chemistry Faculty Of Agriculture Kyoto University

• Senda Mitsugi

  Department Of Agricultural Chemistry College Of Agriculture Kyoto University

• Kinoshita Hideaki

  Department Of Agricultural Chemistry Kyoto University

• Yamane Yoshiyuki

  Department Of Mechanical Engineering Tokyo Institute Of Technology

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