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Plant and Cell Physiology, 1970, Vol. 11, No. 4 541-550
© 1970

Article

Further studies on ribulose-l,5-diphosphate carboxylase from Rhodopseudomonas spheroides and Rhodospirillum rubrum1,2

T. AKAZAWA, T. SUGIYAMA and H. KATAOKA

Seikagaku Seigyo Kenkyu Shiseisu, Nagoya University School of Agriculture, Nagoya, Japan

Some enzymic properties of RuDP carboxylase isolated from Rhodopseudomonas spheroides and Rhodospirillum rubrum, grown under autotrophic, semi-autotrophic and heterotrophic conditions were studied. Regardless of the growing condition, the nature of the enzyme from each respective bacterium remained unchanged. The molecular weight of R. spheroides and R. rubrum RuDP carboxylase was estimated to be approximately 2.4x105 and 8.3x104, respectively. Both enzymes require Mg++. Their kinetic properties were also examined.

1Part XII. Structure and Function of Chloroplast Proteins

2Supported in part by research grants from the Ministry of Education of Japan (No. 8719), USPHS (AM. 10792-03) and the Asahi Press (Tokyo)

(Received March 18, 1970; )
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