Abstract:
:Peroxisomes catalyze a number of essential metabolic functions especially related to lipid metabolism. There is increasing evidence suggesting that peroxisomes are also involved in the synthesis of isoprenoids via the mevalonate pathway at least in rat liver. In order to obtain independent evidence for a role of peroxisomes in isoprenoid synthesis in man, we have measured the activity of two key enzymes of the mevalonate pathway in patients suffering from certain defined defects in peroxisome biogenesis. We now report that mevalonate kinase is not only deficient in livers from Zellweger patients in which peroxisome biogenesis is defective, but also in livers from rhizomelic chondrodysplasia punctata (RCDP) Type 1 patients. In the latter group of patients there is a selective defect in peroxisome biogenesis due to a genetic defect in the PTS2-receptor, a mobile receptor-protein guiding peroxisomal proteins with a certain peroxisomal targeting signal (PTS2) to the peroxisome. Phosphomevalonate kinase was found to be strongly deficient in Zellweger patients thus suggesting that this enzyme is also peroxisomal. Taken together, our data indicate that in human liver mevalonate kinase and phosphomevalonate kinase are truly peroxisomal enzymes which strongly suggests that peroxisomes play a major role in cholesterol biosynthesis.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Wanders RJ,Romeijn GJdoi
10.1006/bbrc.1998.8836subject
Has Abstractpub_date
1998-06-29 00:00:00pages
663-7issue
3eissn
0006-291Xissn
1090-2104pii
S0006-291X(98)98836-2journal_volume
247pub_type
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