ABC50 mutants modify translation start codon selection.
ABC50 mutants modify translation start codon selection.
复制标题
ABC50 突变体修改翻译起始密码子选择。
DOI:
10.1042/bj20141453
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Stewart JD
中科院分区:
文献类型:
--
作者:
Stewart JD
ATP-binding cassette 50 (ABC50; also known as ABCF1) binds to eukaryotic initiation factor 2 (eIF2) and is required for efficient translation initiation. An essential step of this process is accurate recognition and selection of the initiation codon. It is widely accepted that the presence and movement of eIF1, eIF1A and eIF5 are key factors in modulating the stringency of startsite selection, which normally requires an AUG codon in an appropriate sequence context. In the present study, we show that expression of ABC50 mutants, which cannot hydrolyse ATP, decreases general translation and relaxes the discrimination against the use of non-AUG codons at translation start sites. These mutants do not appear to alter the association of key initiation factors to 40S subunits. The stringency of start-site selection can be restored through overexpression of eIF1, consistent with the role of that factor in enhancing stringency. The present study indicates that interfering with the function of ABC50 influences the accuracy of initiation codon selection.
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