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We have completely purified, in parallel, a low molecular weight, non-peptidic, non-lipidic, Na + ,K + -ATPase inhibitory factor from bovine hypothalamic and pituitary tissues. In the final purification step we obtain, from both tissues, a single, homogeneous peak, with a maximal absorbance at 247 nm. This factor, at physiological concentrations of potassium (5-25 mM), inhibits in...
We have purified to apparent homogeneity a heat-stable (HS) factor from the postribosomal supernatant of rabbit reticulocyte lysates [(1988) FEBS Lett. 236, 479-483]. HS inhibits translation in hemin-supplemented lysates and induces phosphorylation of the α-subunit of the eukaryotic initiation factor 2 as does hemin deficiency. The translational inhibition produced by addition of HS to hemin-containing...
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