Cell
Volume 58, Issue 5, 8 September 1989, Pages 857-867
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Article
The poly(A) binding protein is required for poly(A) shortening and 60S ribosomal subunit-dependent translation initiation

https://doi.org/10.1016/0092-8674(89)90938-0Get rights and content

Abstract

Depletion of the essential poly(A) binding protein (PAB) in S. cerevisiae by promoter inactivation or by the utilization of a temperature-sensitive mutation (pab1-F364L) results in the inhibition of translation initiation and poly(A) tail shortening. Reversion analysis of pab1-F364L yielded seven independent, extragenic cold-sensitive mutations (spb1-spb7) that also suppress a PAB1 deletion. These mutations allow translation initiation without significantly changing poly(A) tail lengths in the absence of PAB, and they affect the amount of 60S ribosomal subunit. Consistent with this, SPB2 encodes the ribosomal protein L46. These data suggest that the 60S subunit mediates the PAB requirement of translation initiation, thereby ensuring that only intact poly(A)+ mRNA will be translated efficiently in vivo.

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    Present address: Whitehead institute for Biomedical Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02142.

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