An enzymatic footprinting analysis of the interaction of 40S ribosomal subunits with the internal ribosomal entry site of hepatitis C virus

被引:140
作者
Kolupaeva, VG
Pestova, TV
Hellen, CUT
机构
[1] SUNY Hlth Sci Ctr, Dept Microbiol & Immunol, Brooklyn, NY 11203 USA
[2] Moscow MV Lomonosov State Univ, AN Belozersky Inst Physicochem Biol, Moscow 119899, Russia
关键词
D O I
10.1128/JVI.74.14.6242-6250.2000
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Hepatitis C virus translation is initiated on a similar to 330-nucleotide (nt)-long internal ribosomal entry site (IRES) at the 5' end of the genome. In this process, a 43S preinitiation complex (comprising a 40S ribosomal subunit, eukaryotic initiation factor 3 (eIF3), and a ternary [eIF2-GTP-initiator tRNA] complex) binds the IRES in a precise manner so that the initiation codon is placed at the ribosomal P site. This binding step involves specific interactions between the IRES and different components of the 43S complex. The 40S subunit and eIF3 can bind to the IRES independently; previous analyses revealed that eIF3 binds specifically to an epical half of IRES domain III. Nucleotides in the IRES that are involved in the interaction with the 40S subunit were identified by RNase footprinting and mapped to the basal half of domain III and in domain IV. Interaction sites were identified in locations that have been found to be essential for IRES function, including (i) the epical loop residues GGG(266-268) in subdomain IIId and (ii) the pseudoknot. Extensive protection from RNase cleavage also occurred downstream of the pseudoknot in domain IV, flanking both sides of the initiation codon and corresponding in length to that of the mRNA-binding cleft of the 40S subunit. These results indicate that the 40S subunit makes multiple interactions with the IRES and suggest that only nucleotides in domain IV are inserted into the mRNA-binding cleft of the 40S subunit.
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页码:6242 / 6250
页数:9
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