ISSN:
1432-2048
Keywords:
Endoplasmic reticulum
;
Glycoprotein
;
Glyoxysomes
;
Microsomes
;
Ricinus
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Differential and sucrose density gradient centrifugation have shown that the mannosyl transferase present in germinating castor bean endosperm cells which catalyses the synthesis of mannosyl-phosphoryl-polyisoprenol is exclusively located in the endoplasmic reticulum membrane. This intracellular location was confirmed using both ribosome-denuded microsomes isolated in the presence of EDTA and rough-surfaced microsomes isolated in the presence of excess Mg2+ added to maintain ribosome-membrane attachment. Separation of organelles following the incubation of crude particulate fractions with GDP[14C]mannose demonstrated that most of the mannolipid thus formed remained associated with the microsomal fraction. When organelles were isolated from intact tissue which had previously been incubated with GDP[14C]mannose, [14C]glycoprotein was found to be associated with other cellular fractions in addition to the microsomes, in particular the glyoxysomes. The kinetics of radioactive labelling of these organelles suggest that [14C]glycoprotein appears initially in the microsomal fraction and subsequently accumulates in the glyoxysomes. Subfractionation of isolated, [14C]glycoprotein-labelled glyoxysomes established that over 80% of the total radioactivity was present in the membrane, while sodium dodecyl sulphate-polyacrylamide gel electrophoresis of solubilized glyoxysomal membranes showed that the [14C]sugar moiety was associated with several, but not all, constituent polypeptides.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00388225
