Limitation of ribosomal protein L11 availability in vivo affects translation termination.

Abstract:

:Historically referred to as "the GTPase center", the L11 binding region (L11BR) of Escherichia coli 23 S rRNA is a highly conserved structure that has been implicated in several essential functions during protein synthesis. Here, in vivo expression of an RNA fragment containing that structure was found to affect translation termination in a codon-specific manner. The cause of these effects appeared to be titration of ribosomal protein L11, since normal phenotypes could be restored by simultaneous overproduction of wild-type L11 but not mutant L11. Subsequently, altered termination phenotypes were produced when the availability of L11 was limited by overexpression of RNA antisense to L11 mRNA and, finally, by inactivation of the chromosomal L11 gene, and they too were reversible by simultaneous expression of cloned L11. Our results indicate that in the intact cell the L11BR is an integral functional unit important for translation termination and that the presence of L11 in ribosomes is required for UAG-dependent termination and is somewhat inhibitory of UGA-dependent termination.

journal_name

J Mol Biol

authors

Van Dyke N,Xu W,Murgola EJ

doi

10.1016/S0022-2836(02)00304-2

keywords:

subject

Has Abstract

pub_date

2002-05-31 00:00:00

pages

329-39

issue

2

eissn

0022-2836

issn

1089-8638

pii

S0022-2836(02)00304-2

journal_volume

319

pub_type

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