GONUTS has been updated to MW1.31 Most things seem to be working but be sure to report problems.

Have any questions? Please email us at ecoliwiki@gmail.com

PMID:17259309

From GONUTS
Jump to: navigation, search
Citation

Turner, AM, Love, CF, Alexander, RW and Jones, PG (2007) Mutational analysis of the Escherichia coli DEAD box protein CsdA. J. Bacteriol. 189:2769-76

Abstract

The Escherichia coli cold shock protein CsdA is a member of the DEAD box family of ATP-dependent RNA helicases, which share a core of nine conserved motifs. The DEAD (Asp-Glu-Ala-Asp) motif for which this family is named has been demonstrated to be essential for ATP hydrolysis. We show here that CsdA exhibits in vitro ATPase and helicase activities in the presence of short RNA duplexes with either 3' or 5' extensions at 15 degrees C. In contrast to wild-type CsdA, a DQAD variant of CsdA (Glu-157-->Gln) had no detectible helicase or ATPase activity at 15 degrees C in vitro. A plasmid encoding the DQAD variant was also unable to suppress the impaired growth of the csdA null mutant at 15 degrees C. Plasmid-encoded CsdADelta444, which lacks most of the carboxy-terminal extension, enhanced the growth of a csdA null mutant at 25 degrees C but not at 15 degrees C; this truncated protein also has limited in vitro activity at 15 degrees C. These results support the physiological function of CsdA as a DEAD box ATP-dependent RNA helicase at low temperature.

Links

PubMed PMC1855801 Online version:10.1128/JB.01509-06

Keywords

Adenosine Triphosphatases/genetics; Adenosine Triphosphatases/metabolism; Base Sequence; DEAD-box RNA Helicases/genetics; DNA Mutational Analysis; Escherichia coli/enzymology; Escherichia coli/genetics; Escherichia coli Proteins/genetics; Genetic Variation; Kinetics; Nucleic Acid Conformation; Plasmids; RNA, Bacterial/chemistry; RNA, Bacterial/genetics

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

ECOLI:DEAD

enables

GO:0003724: RNA helicase activity

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ECOLI:DEAD

enables

GO:0004004: ATP-dependent RNA helicase activity

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete


See also

References

See Help:References for how to manage references in GONUTS.