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J. Biochem, 1977, Vol. 81, No. 4 843-850
© 1977 Japanese Biochemical Society

research-article

Production of Copper Coproporphyrin III by Bacillus cereus

II. Regulation of the Biosynthesis of Coproporphyrin III and Its Copper Complex by Oxygen and Heavy Metal Ions

Takako YAMADA-ANKEI*,1, Hidekazu IWASAKI** and Takeshi MORI**

*Botanical Institute, Faculty of Science, Hiroshima University Hiroshima, Hiroshima 730
**Botanical Institute, Faculty of Science, Nagoya University Chikusa-ku, Nagoya, Aichi 464

The effects of oxygen and heavy metal ions on the production of copper coproporphyrin III were studied in Bacillus cereus strain 2.

The formation of copper coproporphyrin III was found to be maximum when the cells were cultivated in G-medium at a low level of oxygen supply, but it was suppressed at extremely low oxygen supply levels.

When the cells were cultured in metal-free G-medium, neither metal-coproporphyrin III nor coproporphyrin III was formed. In the presence of copper in the medium (400-100 µM), the formation of coproporphyrin III copper salt was maximum, but the addition of various heavy metal ions other than copper to the copper-free medium resulted in the formation of neither coproporphyrin III nor its metal chelates. Copper ions appear to be specifically re quired for coproporphyrin III formation.

1Present address: Laboratory for Plant Ecological Studies, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto, Kyoto 606.


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