| Project/Area Number |
10680614
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Functional biochemistry
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| Research Institution | Kagoshima University (1999)
The University of Tokushima (1998) |
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Principal Investigator |
OKA Tatsuzo (1999) Kagoshima University, Faculty of Agriculture, Professor, 農学部, 教授 (50116795)
名取 靖郎 (1998) 徳島大学, 医学部, 教授 (30035381)
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| Co-Investigator(Kenkyū-buntansha) |
岡 達三 鹿児島大学, 農学部, 教授 (50116795)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1999: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1998: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Rat / Perchloric acid-soluble protein / Ribocuclease / mRNA / Translation / Single strand / 過塩素酸可溶性蛋白質 / PSP / 大腸菌 / 遺伝子組換え / 蛋白質合成阻害 / GSR融合蛋白質 |
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| Research Abstract |
Rat liver perchloric acid-soluble protein (L-PSP) is a potent inhibitor of cell-free protein synthesis; however, its mechanism of action is not unknown. Here we show that the protein is a unique ribonuclease and that this activity is responsible for the inhibition of translation. The addition of perchloric acid-soluble protein to a rabbit reticulocyte cell-free system at a concentration of 6.2 μM led to an almost complete inhibition of protein synthesis. The kinetics are unlike those of hemin-controlled inhibitor, a protein that acts at the initiation step. The inhibition appears to be an endoribonucleolytic activity of perchloric acid-soluble protein because L-PSP directly affects mRNA template activity and induces disaggregation of the reticulocyte polysomes into 80S ribosomes, even in the presence of cycloheximide. These effects were observed with authentic as well as recombinant L-PSP. Analysis by thin-layer chromatography of [α -ィイD132ィエD1P]UTP-labeled mRNA incubated with the protein showed production of the ribonucleotide 3'-monophosphates Ap, Gp, UP and Gp, providing direct evidence that the protein is an endoribonuclease. When either 5'- or 3'-32P-labeled 5S rRNA was the substrate, L-PSP cleaved phosphodiester bonds only in the single strand region of the molecule.
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