Ribosome-associated protein that inhibits translation at the aminoacyl-tRNA binding stage.
We have recently isolated and characterized a novel protein associated with Escherichia coli ribosomes and named protein Y (pY). Here we show that the ribosomes from bacterial cells growing at a normal physiological temperature contain no pY, whereas a temperature downshift results in the appearance of the protein in ribosomes. The protein also appears in the ribosomes of those cells that reached the stationary phase of growth at a physiological temperature. Our experiments with cell-free translation systems demonstrate that the protein inhibits translation at the elongation stage by blocking the binding of aminoacyl-tRNA to the ribosomal A site. The function of the protein in adaptation of cells to environmental stress is discussed.
Agafonov
D E
DE
Institute of Protein Research, Russian Academy of Sciences, 142290 Pushchino, Moscow Region, Russia.
Kolb
V A
VA
Spirin
A S
AS
D001426:Bacterial Proteins / Q000378:metabolism*; D001665:Binding Sites; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D029968:Escherichia coli Proteins; D049452:Green Fluorescent Proteins; D008164:Luminescent Proteins / Q000235:genetics / Q000378:metabolism; D011485:Protein Binding; D014176:Protein Biosynthesis; D012346:RNA, Transfer, Amino Acyl / Q000235:genetics / Q000378:metabolism*; D012269:Ribosomal Proteins / Q000378:metabolism*; D012270:Ribosomes / Q000235:genetics* / Q000378:metabolism; D013696:Temperature
D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; D008164:Luminescent Proteins; D012346:RNA, Transfer, Amino Acyl; C434525:RaiA protein, E coli; D012269:Ribosomal Proteins; C499682:YfiA protein, bacteria; D049452:Green Fluorescent Proteins