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Mol. Cell. Biol., 01 1998, 51-57, Vol 18, No. 1
SH Kessler and AB Sachs
The eukaryotic mRNA 3' poly(A) tail and its associated poly(A)-binding
protein (Pab1p) are important regulators of gene expression. One role for
this complex in the yeast Saccharomyces cerevisiae is in translation
initiation through an interaction with a 115-amino-acid region of the
translation initiation factor eIF4G. The eIF4G- interacting domain of Pab1p
was mapped to its second RNA recognition motif (RRM2) in an in vitro
binding assay. Moreover, RRM2 of Pab1p was required for poly(A)
tail-dependent translation in yeast extracts. An analysis of a
site-directed Pab1p mutation which bound to eIF4G but did not stimulate
translation of uncapped, polyadenylated mRNA suggested additional
Pab1p-dependent events during translation initiation. These results support
the model that the association of RRM2 of yeast Pab1p with eIF4G is a
prerequisite for the poly(A) tail to stimulate the translation of mRNA in
vitro.
Copyright © 1998, American Society for Microbiology
RNA recognition motif 2 of yeast Pab1p is required for its functional interaction with eukaryotic translation initiation factor 4G
Department of Molecular and Cell Biology, University of California at Berkeley, 94720, USA.
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