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Guanosine pentaphosphate
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Guanosine pentaphosphate : ウィキペディア英語版
Guanosine pentaphosphate

(p)ppGpp, guanosine pentaphosphate or tetraphosphate is an alarmone which is involved in the stringent response in bacteria, causing the inhibition of RNA synthesis when there is a shortage of amino acids present. This causes translation to decrease and the amino acids present are therefore conserved. Furthermore, ppGpp causes the up-regulation of many other genes involved in stress response such as the genes for amino acid uptake (from surrounding media) and biosynthesis.
== Discovery ==
ppGpp and pppGpp were first identified by Michael Cashel in the 1960s. These nucleotides were found to accumulate rapidly in E. coli cells starved for amino acids, and inhibit synthesis of ribosomal and transfer RNAs.〔Cashel M, Gentry DR, Hernandez VH, Vinella D: The stringent response. In ''Escherichia coli'' and ''Salmonella'': cellular and molecular biology, edn 2. Edited by Neidhardt FC, Curtiss III R, Ingraham JL, Lin ECC, Low KB, Magasanik B, Reznikoff WS, Riley M, Schaechter M, Umbarger HE.ASM Press; 1996. 〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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