Secondary structure in the 5′‐leader or 3′‐untranslated region reduces protein yield but does not affect the functional interaction between the 5′‐cap and the poly(A) tail

FEBS Letters

Ling, Jun¹  Gallie, Daniel R¹  Niepel, Mario¹ 

[1] Department of Biochemistry, University of California, Riverside, CA 92521-0129, USA

关键词: Translation;    Cap;    Poly(A) tail;    RNA structure;    eIF;    eukaryotic initiation factor;    luc;    luciferase;    nt;    nucleotide;    PABP;    poly(A) binding protein;    RRL;    rabbit reticulocyte lysate;    SL;    stem-loop;    UTR;    untranslated region;    WGL;    wheat germ lysate;   

DOI  :  10.1016/S0014-5793(99)01514-8

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The 5′-cap structure and poly(A) tail of eukaryotic mRNAs cooperate to promote translation initiation but whether this functional interaction benefits certain classes of mRNAs has not been investigated. In this study, we investigate whether a structured 5′-leader or 3′-untranslated region (UTR) affects the cap/poly(A) tail interaction. A structured leader reduced the degree to which the 5′-cap promoted translation in plant cells and inhibited translation from capped and uncapped mRNAs equally in yeast. Secondary structure within the 3′-UTR reduced translational efficiency when adjacent to the stop codon but had little effect on the cap/poly(A) tail synergy. The functional interaction between the cap and poly(A) tail was as important for an mRNA with a structured leader or 3′-UTR as it was for an unstructured mRNA in either species, suggesting that these structures can reduce translation without affecting the functional interaction between the cap and poly(A) tail. However, the loss of Xrn1p, the major 5′→3′ exoribonuclease in yeast, abolished cap-dependent translation and the functional interaction between the cap and poly(A) tail, suggesting that the cap/poly(A) tail synergy is of particular importance under conditions of active RNA turnover.

【 授权许可】

Unknown