Arrangement of tRNAs in Pre- and Posttranslocational Ribosomes Revealed by Electron Cryomicroscopy

Arrangement of tRNAs in Pre- and Posttranslocational Ribosomes Revealed by Electron Cryomicroscopy
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电子冷冻显微镜揭示易位前和易位后核糖体中 tRNA 的排列

DOI:
10.1016/s0092-8674(00)81854-1
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发表时间:
1997
期刊:
影响因子:
64.5
通讯作者:
M. Heel
M. Heel
中科院分区:
生物学1区
文献类型:
--
作者:
H. Stark;E. Orlova;J. Rinke;N. Jünke;F. Mueller;M. Rodnina;W. Wintermeyer;R. Brimacombe;M. Heel

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翻译的70S大肠杆菌核糖体的三维结构呈现出两种主要构象:易位前和易位后状态。利用电子冷冻显微镜和角度重构,获得了分辨率为20 Å的结构,与我们之前重建的“空”核糖体相比,其密度与tRNA分子相对应-易位后核糖体的P和E位点以及易位前核糖体的A和P位点。p -位点tRNA位于连接两个核糖体亚基的桥的正上方,a -位点tRNA紧贴在核糖体的L7/L12侧,以约50°的角度与之贴合。e位点tRNA似乎位于30S亚基的旁瓣和L1突起之间。
The three-dimensional structure of the translating 70S E. coli ribosome is presented in its two main conformations: the pretranslocational and the posttranslocational states. Using electron cryomicroscopy and angular reconstitution, structures at 20 Å resolution were obtained, which, when compared with our earlier reconstruction of "empty" ribosomes, showed densities corresponding to tRNA molecules—at the P and E sites for posttranslocational ribosomes and at the A and P sites for pretranslocational ribosomes. The P-site tRNA lies directly above the bridge connecting the two ribosomal subunits, with the A-site tRNA fitted snugly against it at an angle of ∼50°, toward the L7/L12 side of the ribosome. The E-site tRNA appears to lie between the side lobe of the 30S subunit and the L1 protuberance.
大肠杆菌核糖体上 E 位点的地形图。
DOI: 10.1002/j.1460-2075.1993.tb05694.x
发表时间: 1993
期刊: The EMBO journal
影响因子: --
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