Molecular architecture of a eukaryotic translational initiation complex.

Molecular architecture of a eukaryotic translational initiation complex.
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DOI:
10.1126/science.1240585
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发表时间:
2013-11-15
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Scheres SHW
Scheres SHW
中科院分区:
其他
文献类型:
--
作者:
Fernández IS;Bai XC;Hussain T;Kelley AC;Lorsch JR;Ramakrishnan V;Scheres SHW

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The last step in eukaryotic translational initiation involves the joining of the large and small subunit of the ribosome, with initiator tRNA (Met-tRNAiMet) positioned over the start codon of mRNA in the P site. This step is catalyzed by initiation factor eIF5B. We have used recent advances in electron cryo-microscopy (cryo-EM) to determine a structure of the eIF5B initiation complex to 6.6 Å resolution from <3% of the population comprising just 5,143 particles. The structure reveals conformational changes in eIF5B, initiator tRNA and the ribosome that provide insights into the role of eIF5B in translational initiation. The relatively high resolution obtained from such a small fraction of a heterogeneous sample suggests a general approach for characterizing the structure of other dynamic or transient biological complexes.
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