Editorial 21

25-Dihydrosaframycin A(AR1) and 21-decyano-25-dihydrosaframycin A(AR3) were produced by the microbial conversion of saframycin A(SA). Efficient conversion of SA to AR, and AR3 was observed with Rhodococcus amidophifus IFM 144. Though the antimicrobial activity of AR, was one tenth that of SA, the in vitro antitumor activity of AR1 was found to be equivalent to that of SA. In contrast, AR, was b...

An enzyme that catalyzes the reduction of Il-dehydrosteroids has been purified approximately 250-fold from acetone powder extracts of bovine adrenal glands. The reaction is specific for DPNH, but no structural requirements of substrate other than the steroid nucleus were evident. Steroids are competitive inhibitors with respect to 21-dehydrocortisol reduction. The reaction catalyzed was shown t...

............................................................................................................... ii Acknowledgments ................................................................................................ ii Table of