Accelerated poly(A) loss on alpha-tubulin mRNAs during protein synthesis inhibition in Chlamydomonas.

Abstract:

:Detachment of flagella in Chlamydomonas reinhardii stimulates a rapid accumulation of tubulin mRNAs. The induced tubulin mRNAs are normally rapidly degraded following flagellar regeneration, but inhibition of protein synthesis with cycloheximide prevents their degradation. alpha-Tubulin poly(A) tail lengths were measured during normal accumulation and degradation, and in cycloheximide-treated cells. To measure alpha-tubulin mRNA poly(A) chain lengths with high resolution, specific 3' fragments of alpha 1- and alpha 2-tubulin mRNAs, generated by RNase H digestion of mRNA-oligonucleotide hybrids, were sized by Northern analysis. Both alpha-tubulin mRNAs have a newly synthesized poly(A) chain of about 110 adenylate residues. The poly(A) tails shorten with time, and show an average length of 40 to 60 adenylate residues by 90 minutes after deflagellation, at which time induced alpha-tubulin mRNA is being rapidly degraded. Poly(A) loss is significantly accelerated in cycloheximide-treated cells, and this loss is not attributible simply to the longer time the stabilized molecules spend in the cytoplasm. A large fraction of alpha-tubulin mRNA accumulates as mRNA with very short poly(A) tails (less than 10 residues) in the presence of cycloheximide, indicating that deadenylated alpha-tubulin mRNAs can be stable in vivo, at least in the absence of protein synthesis. The rate and extent of poly(A) loss in cycloheximide are greater for alpha 2-tubulin mRNA than for alpha 1-tubulin mRNA. This difference cannot be attributed to differential ribosome loading. This finding is interesting in that the two mRNAs are very similar in sequence with the exception of their 3' untranslated regions.

journal_name

J Mol Biol

authors

Baker EJ,Diener DR,Rosenbaum JL

doi

10.1016/0022-2836(89)90243-x

subject

Has Abstract

pub_date

1989-06-20 00:00:00

pages

771-81

issue

4

eissn

0022-2836

issn

1089-8638

pii

0022-2836(89)90243-X

journal_volume

207

pub_type

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