Recognition of the 70S ribosome and polysome by the RNA degradosome in Escherichia coli.

Abstract:

:The RNA degradosome is a multi-enzyme assembly that contributes to key processes of RNA metabolism, and it engages numerous partners in serving its varied functional roles. Small domains within the assembly recognize collectively a diverse range of macromolecules, including the core protein components, the cytoplasmic lipid membrane, mRNAs, non-coding regulatory RNAs and precursors of structured RNAs. We present evidence that the degradosome can form a stable complex with the 70S ribosome and polysomes, and we demonstrate the proximity in vivo of ribosomal proteins and the scaffold of the degradosome, RNase E. The principal interactions are mapped to two, independent, RNA-binding domains from RNase E. RhlB, the RNA helicase component of the degradosome, also contributes to ribosome binding, and this is favoured through an activating interaction with RNase E. The catalytic activity of RNase E for processing 9S RNA (the ribosomal 5S RNA precursor) is repressed in the presence of the ribosome, whereas there is little affect on the cleavage of single-stranded substrates mediated by non-coding RNA, suggestings that the enzyme retains capacity to cleave unstructured substrates when associated with the ribosome. We propose that polysomes may act as antennae that enhance the rates of capture of the limited number of degradosomes, so that they become recruited to sites of active translation to act on mRNAs as they become exposed or tagged for degradation.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Tsai YC,Du D,Domínguez-Malfavón L,Dimastrogiovanni D,Cross J,Callaghan AJ,García-Mena J,Luisi BF

doi

10.1093/nar/gks739

subject

Has Abstract

pub_date

2012-11-01 00:00:00

pages

10417-31

issue

20

eissn

0305-1048

issn

1362-4962

pii

gks739

journal_volume

40

pub_type

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