期刊
MOLECULAR CELL
卷 67, 期 6, 页码 990-+出版社
CELL PRESS
DOI: 10.1016/j.molcel.2017.08.007
关键词
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资金
- NIH [R01-GM086451]
- HHMI Faculty Scholar Grant [55108536]
- PGA National postdoctoral fellowship
Late in their maturation, nascent small (40S) ribosomal subunits bind 60S subunits to produce 80Slike ribosomes. Because of the analogy of this translation- like cycle to actual translation, and because 80S-like ribosomes do not produce any protein, it has been suggested that this represents a quality control mechanism for subunit functionality. Here we use genetic and biochemical experiments to show that the essential ATPase Fap7 promotes formation of the rotated state, a key intermediate in translocation, thereby releasing the essential assembly factor Dim1 from pre-40S subunits. Bypassing this quality control step produces defects in reading frame maintenance. These results show how progress in the maturation cascade is linked to a test for a key functionality of 40S ribosomes: their ability to translocate the mRNA, tRNA pair. Furthermore, our data demonstrate for the first time that the translation- like cycle is a quality control mechanismthat ensures the fidelity of the cellular ribosome pool.
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