Physical evidence for cotranslational regulation of beta-tubulin mRNA degradation - PubMed (original) (raw)

Physical evidence for cotranslational regulation of beta-tubulin mRNA degradation

N G Theodorakis et al. Mol Cell Biol. 1992 Feb.

Abstract

Tubulin synthesis is controlled by an autoregulatory mechanism through which an increase in the intracellular concentration of tubulin subunits leads to specific degradation of tubulin mRNAs. The sequence necessary and sufficient for the selective degradation of a beta-tubulin mRNA in response to changes in the level of free tubulin subunits resides within the first 13 translated nucleotides that encode the amino-terminal sequence of beta-tubulin, Met-Arg-Glu-Ile (MREI). Previous results have suggested that the sequence responsible for autoregulation resides in the nascent peptide rather than in the mRNA per se, raising the possibility that the regulation of the stability of tubulin mRNA is mediated through binding of tubulin or some other cellular factor to the nascent amino-terminal tubulin peptide. We now show that this putative cotranslational interaction is not mediated by tubulin alone, as no meaningful binding is detectable between tubulin subunits and the amino-terminal beta-tubulin polypeptide. However, microinjection of a monoclonal antibody that binds to the beta-tubulin nascent peptide selectively disrupts the regulation of beta-tubulin, but not alpha-tubulin, synthesis. This finding provides direct evidence for cotranslational degradation of beta-tubulin mRNA mediated through binding of one or more cellular factors to the beta-tubulin nascent peptide.

PubMed Disclaimer

Similar articles

Cited by

References

    1. Biochim Biophys Acta. 1962 Oct 8;63:530-2 - PubMed
    1. Cell. 1979 Jun;17(2):319-25 - PubMed
    1. J Biol Chem. 1975 May 25;250(10):4007-21 - PubMed
    1. Nature. 1975 Aug 7;256(5517):495-7 - PubMed
    1. Nature. 1988 Aug 18;334(6183):580-5 - PubMed

Publication types

MeSH terms

Substances

LinkOut - more resources