CBT1 interacts genetically with CBP1 and the mitochondrially encoded cytochrome b gene and is required to stabilize the mature cytochrome b mRNA of Saccharomyces cerevisiae.

Abstract:

:Mutation of a CCG sequence in the 5'-untranslated region of the mitochondrially encoded cytochrome b mRNA in Saccharomyces cerevisiae results in destabilization of the message and respiratory deficiency of the mutant strain. This phenotype mimics that of a mutation in the nuclear CBP1 gene. Here it is shown that overexpression of the nuclear CBT1 gene, due to a transposon insertion in the 5'-untranslated region, rescues the respiratory defects resulting from mutating the CCG sequence to ACG. Overexpressing alleles of CBT1 are allelic to soc1, a previously isolated suppressor of cbp1ts-induced temperature sensitivity of respiratory growth. Quantitative primer extension analysis indicated that cbt1 null strains have defects in 5'-end processing of precursor cytochrome b mRNA to the mature form. Cbt1p is also required for stabilizing the mature cytochrome b mRNA after 5' processing.

journal_name

Genetics

journal_title

Genetics

authors

Ellis TP,Schonauer MS,Dieckmann CL

doi

10.1534/genetics.104.036467

keywords:

subject

Has Abstract

pub_date

2005-11-01 00:00:00

pages

949-57

issue

3

eissn

0016-6731

issn

1943-2631

pii

genetics.104.036467

journal_volume

171

pub_type

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