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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Gene Review: 

deaD  -  ATP-dependent RNA helicase

Escherichia coli str. K-12 substr. MG1655

Synonyms: ECK3150, JW5531, csdA, mssB, rhlD
 
 
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Disease relevance of deaD

  • A 70-kDa protein was specifically induced in Escherichia coli when the culture temperature was shifted from 37 to 15 degrees C. The protein was identified to be the product of the deaD gene (reassigned csdA) encoding a DEAD-box protein [1].
 

High impact information on deaD

  • Here we show that one of the factors (W2) required to reconstitute translation in E. coli is encoded by the deaD gene which harbors 87% amino acid sequence similarly to the eukaryotic (eIF4A) [2].
  • It has been proposed that this effect is due to highly conserved 11-base sequences designated the "cold box" existing in the 5' UTRs of cspA, cspB, and csdA [3].
  • We have isolated and characterized two multicopy suppressors, mssA and mssB, which suppress the cold-sensitive growth phenotype of the smbA2 mutant of Escherichia coli [4].
 

Biological context of deaD

  • The inferred amino acid sequence of the protein shows remarkable similarity to eIF4A, a murine translation initiation factor that has an ATP-dependent RNA helicase activity and is a founding member of the D-E-A-D family of proteins (characterized by a conserved Asp-Glu-Ala-Asp motif) [5].

References

  1. Cold shock induces a major ribosomal-associated protein that unwinds double-stranded RNA in Escherichia coli. Jones, P.G., Mitta, M., Kim, Y., Jiang, W., Inouye, M. Proc. Natl. Acad. Sci. U.S.A. (1996) [Pubmed]
  2. Molecular characterization of a prokaryotic translation factor homologous to the eukaryotic initiation factor eIF4A. Lu, J., Aoki, H., Ganoza, M.C. Int. J. Biochem. Cell Biol. (1999) [Pubmed]
  3. Role of the cold-box region in the 5' untranslated region of the cspA mRNA in its transient expression at low temperature in Escherichia coli. Fang, L., Hou, Y., Inouye, M. J. Bacteriol. (1998) [Pubmed]
  4. Multicopy suppressors, mssA and mssB, of an smbA mutation of Escherichia coli. Yamanaka, K., Ogura, T., Koonin, E.V., Niki, H., Hiraga, S. Mol. Gen. Genet. (1994) [Pubmed]
  5. deaD, a new Escherichia coli gene encoding a presumed ATP-dependent RNA helicase, can suppress a mutation in rpsB, the gene encoding ribosomal protein S2. Toone, W.M., Rudd, K.E., Friesen, J.D. J. Bacteriol. (1991) [Pubmed]
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