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A novel nuclear gene, CBT1, essential for mitochondrial cytochrome b formation: terminal processing of mRNA and intron dependence.

Abstract：

:We describe a new nuclear gene, CBT1 (Cytochrome B Termination), specifically involved in the generation of mature mRNA of cytochrome b in yeast mitochondria. Disruption of CBT1 (corresponding to ORF YKL 208W) results in a respiratory deficiency (no growth on acetate and ethanol, a reduced growth on glycerol, and a moderate growth on lactate). Cytochrome b is practically undetectable spectrally, while cytochromes a and a3 (cytochrome oxidase) appear unaffected by the disruption. Analysis of mitochondrial transcripts shows a reduced abundance of cytb mRNA, which in addition is approximately 200 nucleotides longer than that of the wild-type. Sequencing of the 3' region of the mutant cytb mRNA with an oligonucleotide primer positioned 148 nt downstream from the dodecamer sequence ("end-of-messenger" signal), demonstrates that the mutant transcript is extended beyond this position and is not processed at the conserved dodecamer cleavage site. The CBT1 gene product may be one of the components required for the exact 3' cleavage of the cytb messenger and may also be related to RNA splicing, since the intron-containing cytb gene is not as well expressed as the intron-less gene and the respiratory deficiency is more severe. We propose, that the CBT1 protein is necessary for the correct trimming of the end of cytb pre-mRNA and may be a part of the multi-component complex involved in this process.

journal_name

Curr Genet

journal_title

Current genetics

authors

Rieger KJ,Aljinovic G,Lazowska J,Pohl TM,Slonimski PP,Aljinovic G

doi

10.1007/s002940050262

subject

Has Abstract

pub_date

1997-09-01 00:00:00

pages

163-74

issue

3

eissn

0172-8083

issn

1432-0983

journal_volume

32

pub_type

杂志文章

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