Structure of mRNA encoded by tubulin genes in Leishmania enriettii.

Abstract:

:Both the alpha- and beta-tubulin genes of Leishmania enriettii are encoded by mRNA of 2.0-2.2 kb in length. We have shown previously that the alpha- and beta-tubulin genes are arranged in separate, tandem repeats of 2 and 4 kb, respectively, and now report the mapping of mature mRNA onto these cloned genes. Here we show that the alpha-tubulin gene contains a very short intergenic region (100-200 bases) whereas the larger, tandemly repeated beta-tubulin gene contains a 1.8-2.0 kb region not found in mature mRNA. Comparison of S-1 mapping and primer extension results indicates that the messenger RNAs for both alpha- and beta-tubulin contain a sequence of about 35 base pairs located at the 5' end that is not encoded contiguously with the rest of the mRNA. This short 5' sequence may be added to the body of the tubulin mRNAs either through splicing of a precursor RNA molecule or by a novel post-transcriptional processing reaction. The alpha- and beta-tubulin genes are arranged identically in the two developmental stages of the parasite life cycle and are present in equal copy number.

journal_name

Mol Biochem Parasitol

authors

Landfear SM,Wirth DF

doi

10.1016/0166-6851(85)90029-5

subject

Has Abstract

pub_date

1985-04-01 00:00:00

pages

61-82

issue

1

eissn

0166-6851

issn

1872-9428

pii

0166-6851(85)90029-5

journal_volume

15

pub_type

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