The role of ERG20 gene (encoding yeast farnesyl diphosphate synthase) mutation in long dolichol formation. Molecular modeling of FPP synthase

详细信息    查看全文

• 作者：Plochocka ; Danuta ; Karst ; Francis ; Swiezewska ; Ewa ; Szkopinska ; Anna
• 关键词：FPP synthase ; dolichol ; molecular modeling ; yeast ; Saccharomyces cerevisiae ; DMAPP ; dimethylallyl diphosphate ; IPP ; isopentenyl diphosphate ; GPP ; geranyl diphosphate ; Dol ; dolichol ; Pren ; prenol ; FPP ; farnesyl diphosphate
• 刊名：Biochimie
• 出版年：2000
• 出版时间：August, 2000
• 年：2000
• 卷：82
• 期：8
• 页码：733-738
• 全文大小：882 K

文摘

The yeast Saccharomyces cerevisiae strain LB332 bearing a mutation in the ERG20 gene encoding farnesyl diphosphate synthase (FPPS) synthesizes significantly longer dolichols than the wild type strain FL100 (14–31 and 14–19 isoprene units, respectively). The measurement of the short chain prenyl alcohols excreted into the medium shows that increased amounts of geraniol, dimethylallyl and isopentenyl alcohols but not farnesol are synthesized by the mutant strain. The wild type FPPS synthesizes farnesyl diphosphate (FPP) as the only product. The K197E substitution, as opposed to F112A/F113S in avian FPPS, does not change product specificity. Consequently, the possibility that mutated yeast FPPS synthesizes longer polyprenols is unlikely. This is supported by additional evidence such as in vitro analysis of the mutated FPPS products and molecular modeling. We suggest that formation of longer dolichols in vivo is the result of a change in the isopentenyl diphosphate/farnesyl diphosphate ratio caused by the erg20 mutation which in turn affects the activity of cis-prenyltransferase.