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. 1975 Dec 1;67(3):687–699. doi: 10.1083/jcb.67.3.687

Biogenesis of microsomal membrane glycoproteins in rat liver. I. Presence of glycoproteins in microsomes and cytosol

PMCID: PMC2111650  PMID: 172515

Abstract

The glycoproteins of microsomes and cytosol were studied. Various washing procedures did not release the proteins from the microsomes, and immunological tests demonstrated that the sialoproteins are not serum components. Low concentrations of deoxycholate and incubation in 0.25 M sucrose solution liberated a small amount of microsomal sialoprotein and this fraction exhibited a high degree of labeling of protein-bound N-acetylneuraminic acid. A part of the glycoprotein fraction could not be solubilized, even with a high concentration of the detergent. Thoroughly perfused rat liver contained sialoproteins in the particle-free supernate. The level of sialoprotein present could not be due to contamination with serum or broken organelles. The high in vivo incorporation of [3H]glucosamine into protein-bound sialic acid of Golgi membranes and cytosol was paralleled by a delayed and lesser rate of incorporation into the rough and smooth microsomal membranes. This incorporation pattern suggests the possibility that the glycoproteins of cytosol and Golgi may later be incorporated into the membrane of the endoplasmic reticulum.

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Selected References

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