Reference: Mitsui K, et al. (1988) On the size and the role of a free cytosolic pool of acidic ribosomal proteins in yeast Saccharomyces cerevisiae. J Biochem 104(6):908-11

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Abstract


A small but distinct amount of yeast acidic ribosomal proteins A1/A2 was detected in cytosol by immunoblotting on a two-dimensional gel electrophoretogram, while 38 kDa acidic protein A0 was not detected. The free forms of A1/A2 in the cytosol were eluted in gel filtration at the molecular mass of about 30 kDa under non-denaturation conditions, suggesting that they exist as a dimer or timer without association with A0. The amount of free A1/A2 was determined by immunoblotting to be 0.3% of the ribosome-bound A1/A2 in yeast. The time course of incorporation of radioactive amino acid showed that the cytosolic free A1/A2 are labeled more rapidly with high specific radioactivity than the ribosome-bound A1/A2. This result suggested that some of the cytosolic A1/A2, if not all, are newly-synthesized proteins which are ready for incorporation into cytoplasmic ribosomes.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Mitsui K, Nakagawa T, Tsurugi K
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