The mechanisms of toxicity to isolated rat hepatocytes of two structurally related naphthoquinones have been studied. Both 5-OH-1,4-naphthoquinone (5-OH-1,4-NQ; juglone) and 2-OH-1,4-naphthoquinone (2-OH-1,4-NQ; lawsone) caused a concentration-dependent cytotoxicity to hepatocytes which was preceded
Redox reactions of isoalloxazines with 2-hydroxy-1,3-propanedithiol and NADH; the roles of the 4α- and 5-positions.
✍ Scribed by Stewart J. Gumbley; Lyndsay Main
- Publisher
- Elsevier Science
- Year
- 1976
- Tongue
- French
- Weight
- 214 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
✦ Synopsis
Kinetic evidence eliminates the 6-and I-positions as essential centres for dithiol addition in reduction of some new isoalloxazines; and suggests that specific orientation effects of NADH within its complexes with the isoalloxazines may be responsible for the abnormal order of relative rates of isoalloxazine reduction observed.
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Recently we reported [1,2] the synthesis and antibacterial activity of 3-deoxy-5-O-(4deoxymycaminosyl)tylonolide ( 1). This study demonstrated that removal of both the 3and 4'-hydroxy groups of 5-O-mycaminosyltylonolide greatly enhances the activity. To prepare a more-active derivative than 1, intro