| Autor: |
Zhang, Kan, Pettersson-Landén, Lena, Fredriksson, Mats G, Öfverstedt, Lars-Göran, Skoglund, Ulf, Isaksson, Leif A |
| Zdroj: |
Experimental Cell Research; February 1998, Vol. 238 Issue: 2 p335-344, 10p |
| Abstrakt: |
Computer-aided electron tomography has been used to visualize ribosomes inEscherichia colicells treated with kirromycin. This antibiotic stops bacterial growth by blocking the release of EF-Tu.GDP from the ribosome after GTP cleavage. Ribosomes in the kirromycin-treated cells are very compact, with the two subunits in close contact with each other. This closed structure is different from the open structure with spatially separated subunits that characterizes ribosomes in tryptophan-starved cells, giving deficiency for tryptophanyl.tRNA. A comparison of ribosomes in exponentially growing bacteria suggests that most ribosomes in an undefined working mode are in the closed conformation. |
| Databáze: |
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