Characterization of Ribonuclease A Irradiated with γ-Rays in the Presence of Cytidylic Acid with Respect to the Interaction of the Enzyme with Folic Acid : SHORTC OMMUNICATION
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γ-Irradiation of bovine pancreatic ribonuclease A in the presence of cytidine 2' (3') -phosphate produced an enzymatically active derivative (s) of the enzyme which was similar to that described by Ukita and Waku (T. Ukita and K. Waku (1964) J. Biochem. 55:420-431). The V_<max>-values of the enzyme for two synthetic substrates decreased to half by irradiation, while the Km-values were unchanged. Studies on the affinity of the irradiated enzyme for folic acid suggests that not only the main active site (B_1-R_1-p_1) but also the sub-site (B_2) seems remained intact after γ-irradiation under the conditions used.
- 日本放射線影響学会の論文
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