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Mol Cell Biol. 1987 Sep;7(9):3268-76.

A single domain of yeast poly(A)-binding protein is necessary and sufficient for RNA binding and cell viability.

Author information

  • 1Department of Cell Biology, Stanford University School of Medicine, California 94305.

Abstract

The poly(A)-binding protein (PAB) gene of Saccharomyces cerevisiae is essential for cell growth. A 66-amino acid polypeptide containing half of a repeated N-terminal domain can replace the entire protein in vivo. Neither an octapeptide sequence conserved among eucaryotic RNA-binding proteins nor the C-terminal domain of PAB is required for function in vivo. A single N-terminal domain is nearly identical to the entire protein in the number of high-affinity sites for poly(A) binding in vitro (one site with an association constant of approximately 2 X 10(7) M-1) and in the size of the binding site (12 A residues). Multiple N-terminal domains afford a mechanism of PAB transfer between poly(A) strands.

PMID:
3313012
[PubMed - indexed for MEDLINE]
PMCID:
PMC367964
Free PMC Article
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