共 209 条
Structural insights into translational fidelity
被引:460
作者:
Ogle, JM
[1
]
Ramakrishnan, V
[1
]
机构:
[1] MRC, Mol Biol Lab, Cambridge CB2 2QH, England
关键词:
ribosome;
crystallography;
decoding;
accuracy;
antibiotics;
D O I:
10.1146/annurev.biochem.74.061903.155440
中图分类号:
Q5 [生物化学];
Q7 [分子生物学];
学科分类号:
071010 ;
081704 ;
摘要:
The underlying basis for the accuracy of protein synthesis has been the subject of over four decades of investigation. Recent biochemical and structural data make it possible to understand at least in outline the structural basis for tRNA selection, in which codon recognition by cognate tRNA results in the hydrolysis of GTP by EF-Tu over 75 angstrom away. The ribosome recognizes the geometry of codon-anticodon base pairing at the first two positions but monitors the third, or wobble position, less stringently. Part of the additional binding energy of cognate tRNA is used to induce conformational changes in the ribosome that stabilize a transition state for GTP hydrolysis by EF-Tu and subsequently result in accelerated accommodation of tRNA into the peptidyl transferase center. The transition state for GTP hydrolysis is characterized, among other things, by a distorted tRNA. This picture explains a large body of data on the effect of antibiotics and mutations on translational fidelity. However, many fundamental questions remain, such as the mechanism of activation of GTP hydrolysis by EF-Tu, and the relationship between decoding and frameshifting.
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页码:129 / 177
页数:49
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