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Title: Distinct and redundant functions of three homologs of RNase III in the cyanobacterium Synechococcus sp. strain PCC 7002

Journal Article · · Nucleic Acids Research
DOI:https://doi.org/10.1093/nar/gky041· OSTI ID:1430778
 [1];  [2]; ORCiD logo [1]
  1. Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA, Microbiology Doctoral Training Program, University of Wisconsin-Madison, Madison, WI 53706, USA
  2. Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA

RNase III is a ribonuclease that recognizes and cleaves double-stranded RNA. Across bacteria, RNase III is involved in rRNA maturation, CRISPR RNA maturation, controlling gene expression, and turnover of messenger RNAs. Many organisms have only one RNase III while others have both a full-length RNase III and another version that lacks a double-stranded RNA binding domain (mini-III). The genome of the cyanobacterium Synechococcus sp. strain PCC 7002 (PCC 7002) encodes three homologs of RNase III, two full-length and one mini-III, that are not essential even when deleted in combination. To discern if each enzyme had distinct responsibilities, we collected and sequenced global RNA samples from the wild type strain, the single, double, and triple RNase III mutants. Approximately 20% of genes were differentially expressed in various mutants with some operons and regulons showing complex changes in expression levels between mutants. Two RNase III's had a role in 23S rRNA maturation and the third was involved in copy number regulation one of six native plasmids. In vitro, purified RNase III enzymes were capable of cleaving some of the known Escherichia coli RNase III target sequences, highlighting the remarkably conserved substrate specificity between organisms yet complex regulation of gene expression.

Research Organization:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0010329
OSTI ID:
1430778
Alternate ID(s):
OSTI ID: 1502458
Journal Information:
Nucleic Acids Research, Journal Name: Nucleic Acids Research Vol. 46 Journal Issue: 4; ISSN 0305-1048
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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Figures / Tables (7)