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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

The subcellular localization of enzymes of dolichol metabolism in rat liver.

Dolichyl phosphate is an intermediate in the glycosylation of N-glycosamidic linked glycoproteins in mammalian systems, and its availability may be a limiting factor in glycoprotein biosynthesis. The basic kinetics and subcellular distribution of enzymes which may influence the concentration of dolichyl phosphate in rat liver have therefore been investigated. These include dolichyl phosphate phosphatase, dolichol phosphokinase, dolichyl fatty acyl ester synthetase, GDP-mannose dolichyl phosphate mannosyl transferase, and UDP-glucose dolichyl phosphate glucosyl transferase. The specific activity of the enzymes was highest in the microsomes, except for dolichyl phosphate phosphatase and dolichyl fatty acyl ester synthetase, which were most concentrated in the plasma membrane and the cytosol fraction, respectively. The nuclei contained all of the enzyme activities while the mitochondria and cytoplasm were generally less active. The presence of both dolichol phosphokinase and dolichyl phosphate phosphatase in microsomes and nuclei, which contain the highest glycosyl transferase activities, may provide a means for direct enzymatic control of levels of dolichyl phosphate.[1]

References

  1. The subcellular localization of enzymes of dolichol metabolism in rat liver. Rupar, C.A., Rip, J.W., Chaudhary, N., Carroll, K.K. J. Biol. Chem. (1982) [Pubmed]
 
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