Isolation and mapping of a gene for protein synthesis initiation factor 4A and its expression during differentiation of murine erythroleukemia cells

Gene
N S ReddyA J Wahba

Abstract

Eukaryotic protein synthesis initiation factor 4A (eIF-4A), a 46-kDa polypeptide, is involved both in mRNA cap recognition and in the binding of mRNA to 40S ribosomal subunits. A 41-mer oligodeoxynucleotide probe was synthesized complementary to a portion of the published coding sequence of eIF-4A mRNA [Nielsen et al., Nucleic Acids Res. 13 (1985) 6867-6870] and used to screen a mouse genomic library. We have isolated and characterized a full-length clone from that library. The eIF-4A sequence is contained in eleven exons. The eleventh exon also has the 3'-nontranslated sequence and two separate polyadenylation sites. Northern-blot analysis of mouse poly(A)+RNA indicates that there are several distinct mRNA species coding for eIF-4A. Two of these contain the same coding sequence and differ only in the length of the 3'-nontranslated region. Two of the eIF-4A mRNAs are therefore likely to be the result of differential processing at the 3'-end. We have used a fragment of the genomic clone to measure the steady-state levels of eIF-4A mRNA during the induced differentiation of murine erythroleukemia cells. S1 nuclease protection experiments demonstrated that by the fourth day after induction eIF-4A mRNA declined to 25% of its steady...Continue Reading

References

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Citations

Jan 1, 1991·Pharmacology & Therapeutics·S J Morley, G Thomas
Aug 27, 1990·Biochimica Et Biophysica Acta·W C MerrickC L Owens
Dec 10, 1996·Proceedings of the National Academy of Sciences of the United States of America·R D PalmiterS D Findley
Mar 25, 1992·Nucleic Acids Research·J Cavallius, W C Merrick
Apr 25, 1993·Nucleic Acids Research·N S KimS Kato
Apr 25, 2000·Journal of Molecular and Cellular Cardiology·S E JohnattyM Abdellatif

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