Comparative study of in vivo stigmasterol biosynthesis in Nicotiana tabacum and Hordeum vulgare |
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Affiliation: | 1. Pharmacy Department, Hospital Universitari Bellvitge, IDIBELL, Universitat Barcelona, Barcelona, Spain;2. Clinical Laboratory Department, Hospital Universitari Bellvitge, IDIBELL, Universitat Barcelona, Barcelona, Spain;3. Endocrinology Department, Hospital Universitari Bellvitge, IDIBELL, Universitat Barcelona, Barcelona, Spain;4. Surgery Department, Hospital Universitari Bellvitge, IDIBELL, Universitat Barcelona, Barcelona, Spain;1. Pharmacy Department, Hospital Universitari Bellvitge, IDIBELL, Universitat Barcelona, L''Hospitalet de Llobregat, Spain;2. Clinical Laboratory Department, Hospital Universitari Bellvitge, IDIBELL, Universitat Barcelona, L''Hospitalet de Llobregat, Spain;3. Endocrinology Department, Hospital Universitari Bellvitge, IDIBELL, Universitat Barcelona, L''Hospitalet de Llobregat, Spain;4. Surgery Department, Hospital Universitari Bellvitge, IDIBELL, Universitat Barcelona, L''Hospitalet de Llobregat, Spain, |
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Abstract: | Six-day-old tobacco (Nicotiana tabacum) and barley (Hordeum vulgare) seedlings rapidly incorporated and metabolized exogenously supplied [4-14C]sitosterol but neither plant was able to convert it into stigmasterol. However, a sterol metabolite was isolated from both species and the acetate derivative was slightly more polar, on AgNO3—silica gel TLC, than stigmasteryl acetate. A similar metabolite was also obtained with [4-14C]cholesterol, indicating a general metabolic reaction of plants to exogenous sterols. Both species incorporated [2-14C]mevalonic acid into sitosterol and stigmasterol. We suggest that in vascular plants, whether monocotyledons or dicotyledons, the pathway of stigmasterol biosynthesis is not via sitosterol but through a common precursor which is derived from mevalonic acid. |
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