The addition of O-linked N-acetylglucosamine (GlcNAc) to the major nuclear pore complex glycoprotein p62 was examined. Expression of the rat p62 cDNA in transfected monkey cells was detected using a rat p62-specific antipeptide antiserum and two previously described nuclear pore-specific monoclonal antibodies which require O-linked GlcNAc for binding. Although the p62 cDNA was predicted to enco...

In the search for the biochemical basis of the control of glycosylation of cell surface carbohydrates, revertant clones were isolated from previously characterized wheat germ agglutinin-resistant clones of B16 mouse melanoma cells by selection for resistance to Lotus tetragonolobus lectin or to ricin. Comparison of the wheat germ agglutinin-resistant clones with the parent and revertant clones ...

Poly(A) containing mRNA prepared from poly(rI)-poly(rC)-induced human fibroblasts stimulated [14C]leucine incorporation into protein in wheat germ cell-free extracts. For the translation of interferon mRNA into a biologically active product, the presence of spermine was essential. The protein synthesized in vitro fulfilled the criteria for human interferon--namely, its antiviral activity was sp...

The interaction of glycoproteins of rough and smooth microsomal and Golgi membranes with Sepharose-bound lectins has been studied. One of these lectins was a crude preparation from wheat germ lipase which was found to bind primarily to N-acetyl neuraminic acid. Rough microsomes, smooth microsomes and Golgi membranes contain glycoproteins which bind to Concanavalin A (Con A specific for mannose ...

The root weevil Diaprepes abbreviatus L. has been continuously reared since 1992 on an artificial diet (F1675) first reported in 1982. The weight of weevils reared on F1675 was more than twice as great as field-collected individuals. Recently, several ingredients included in the original F1675 diet were shown to have little or no effect on insect performance. We examined the effects of varying ...

Total cytoplasmic RNA, isolated from bovine anterior pituitary glands, directed the synthesis of primarily two proteins in a wheat germ cell-free system. Analysis of wheat germ cell-free products by sodium dodecyl sulfate-slab gel electrophoresis, direct immunoprecipitation with prolactin aatibody, and prolactin- and growth hormone-specific radioimmunoassay indicated that the two proteins were ...

Both the 5' cap (m7GpppN) and the 3' poly(A) tail of eukaryotic mRNAs are important regulators of translation efficiency in vivo. Their function, however, is markedly reduced in in vitro translation systems derived from either rabbit reticulocytes or wheat germ. The impact of exogenous poly(A) on cap-dependent translation was examined in vitro. The translation of uncapped mRNA was preferentiall...

Although muscle cell fusion was shown to be an energy-requiring process, release of myoblasts from an EGTA fusion block could be accomplished with Earle's balanced salt solution (containing 1.8 mM Ca++) free of glucose or any other energy-produced metabolite. The effect of concanavalin A, abrin, and the lectins from wheat germ, soybean, and Lens culinaris on myoblast fusion was examined with sy...

Mammalian high temperature requirement A3 (HtrA3) is a serine protease of the HtrA family. It is an important factor for placental development and a tumor suppressor. The biochemical properties of HtrA3 are uncharacterized. One critical step in biochemical characterization is overexpressing and purifying the full-length recombinant protein. However, utility of cell-based expression systems is l...