TRANSLATION BY ESCHERICHIA-COLI RIBOSOMES OF ALFALFA MOSAIC-VIRUS RNA 4 CAN BE INITIATED AT 2 SITES ON THE MONOCISTRONIC MESSAGE

被引:7
作者
CASTEL, A
KRAAL, B
KONIECZNY, A
BOSCH, L
机构
[1] Biochemisch Laboratorium, Rijksuniversiteit Leiden, Leiden, 2333 AL
[2] Instytut Biochemii, Akademia Rolnicza, Poznán, PL-60-637
来源
EUROPEAN JOURNAL OF BIOCHEMISTRY | 1979年 / 101卷 / 01期
关键词
D O I
10.1111/j.1432-1033.1979.tb04224.x
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
Substantial evidence is provided to corroborate our previous finding that Escherichia coli ribosomes recognize two binding sites on the 5′ end of alfalfa mosaic virus (AMV) RNA 4 [for a preliminary report see Castel, A., Kraal, B., Kerklaan, P. R. M., Klok, J., and Bosch, L. (1977) Proc. Natl Acad. Sci. U. S. A. 74, 5509–5513]. Translation can start at either site using AcPhe‐tRNA or fMet‐tRNA as initiator and takes place in the same reading frame along the monocistronic mRNA. The size and composition of the isolated extra NH2‐terminal fragment of the acetylphenylalanyl product were found to be in agreement with the 5′ non‐coding region of the messenger. Removal of the 5′‐terminal cap structure of AMV RNA 4 did not influence significantly both initiation reactions. Ribosomal protein S1 was essential for binding as well as incorporation of both fMet‐tRNA and AcPhe‐tRNA. A similar interaction on the ribosome was found for AcPhe‐tRNA directed by AMV RNA 4 as for fMet‐tRNA directed by either AMV RNA 4 or MS2 RNA with respect to the influence of initiation factors. It is concluded that the heterologous plant viral messenger is reliably translated in the E. coli system and that E. coli ribosomes recognize with high specificity an extra initiation site close to the 5′ extremity of the messenger. The relationship of this site to a hypothetical entry site involved in the early recognition in the initiation mechanism between ribosome and messenger is discussed. Copyright © 1979, Wiley Blackwell. All rights reserved
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页码:123 / 133
页数:11
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