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- W1971459302 abstract "Highly purified rough endoplasmic reticulum and three subfractions of golgi were prepared from 105,000g pellet of the homogenate by centrifugation in floatation and sedimentation discontinuous sucrose gradients. Highly purified plasma membranes were also prepared from 9,000g pellet of the same homogenates for assessment under the same experimental conditions. Although 5′-nucleotidase, a marker for plasma membranes, was markedly enriched in plasma membranes, very little or none of this enzyme activity was found in other fractions. Very little or no NADH cytochrome c reductase activity, a marker for rough endoplasmic reticulum, was found in fractions other than rough endoplasmic reticulum. Galactosyl transferase, a marker for golgi, was found and enriched in all the fractions; however, enrichment in golgi fractions was higher than in other fractions. Very little or no lysosomal marker activity, i.e., acid phosphatase, was found in rough endoplasmic reticulum or golgi fractions as compared to lysosomes. These marker enzyme data suggested that rough endoplasmic reticulum and golgi fractions were relatively pure with little or no cross contamination with other organelles. The [125I]human choriogonadotropin ([125I]hCG), [3H]prostaglandin (PG)E1, and [3H]PGF2a specifically bound to rough endoplasmic reticulum and golgi fractions in addition to plasma membranes. The enrichments of binding in the former two fractions, in some cases, were as high as plasma membranes itself. The specific binding of some of the ligands was found to be partially latent in rough endoplasmic reticulum and golgi fractions but not in plasma membranes. Marker enzyme data, ratio between bindings and marker enzyme activities (an index of organelle contamination), and partial latency of binding suggest that rough endoplasmic reticulum and golgi fractions intrinsically contain gonadotropin and PGs binding sites." @default.
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- W1971459302 date "1978-11-01" @default.
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- W1971459302 title "Gonadotropin and prostaglandins binding sites in rough endoplasmic reticulum and golgi fractions of bovine corpora lutea" @default.
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- W1971459302 doi "https://doi.org/10.1016/0003-9861(78)90096-6" @default.
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