Investigating the in vivo activity of the DeaD protein using protein–protein interactions and the translational activity of structured chloramphenicol acetyltransferase mRNAs
Identifieur interne : 002572 ( Main/Exploration ); précédent : 002571; suivant : 002573Investigating the in vivo activity of the DeaD protein using protein–protein interactions and the translational activity of structured chloramphenicol acetyltransferase mRNAs
Auteurs : Gareth Butland ; Nevan J. Krogan ; Jianhua Xu ; Wen-Hong Yang ; Hiroyuki Aoki ; Joyce S. Li ; Naden Krogan [Canada] ; Javier Menendez ; Gerard Cagney ; Gholam C. Kiani [Canada] ; Mathew G. Jessulat [Canada] ; Nira Datta ; Ivan Ivanov [Bulgarie] ; Mounir G. Abouhaidar [Canada] ; Andrew Emili ; Jack Greenblatt ; M. Clelia Ganoza ; Ashkan Golshani [Canada]Source :
- Journal of Cellular Biochemistry [ 0730-2312 ] ; 2007-02-15.
English descriptors
- KwdEn :
Abstract
Here, we report the use of an in vivo protein–protein interaction detection approach together with focused follow‐up experiments to study the function of the DeaD protein in Escherichia coli. In this method, functions are assigned to proteins based on the interactions they make with others in the living cell. The assigned functions are further confirmed using follow‐up experiments. The DeaD protein has been characterized in vitro as a putative prokaryotic factor required for the formation of translation initiation complexes on structured mRNAs. Although the RNA helicase activity of DeaD has been demonstrated in vitro, its in vivo activity remains controversial. Here, using a method called sequential peptide affinity (SPA) tagging, we show that DeaD interacts with certain ribosomal proteins as well as a series of other nucleic acid binding proteins. Focused follow‐up experiments provide evidence for the mRNA helicase activity of the DeaD protein complex during translation initiation. DeaD overexpression compensates for the reduction of the translation activity caused by a structure placed at the initiation region of a chloramphenicol acetyltransferase gene (cat) used as a reporter. Deletion of the deaD gene, encoding DeaD, abolishes the translation activity of the mRNA with an inhibitory structure at its initiation region. Increasing the growth temperature disrupts RNA secondary structures and bypasses the DeaD requirement. These observations suggest that DeaD is involved in destabilizing mRNA structures during translation initiation. This study also provides further confirmation that large‐scale protein–protein interaction data can be suitable to study protein functions in E. coli. J. Cell. Biochem. 100: 642–652, 2007. © 2006 Wiley‐Liss, Inc.
Url:
DOI: 10.1002/jcb.21016
Affiliations:
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<front><div type="abstract" xml:lang="en">Here, we report the use of an in vivo protein–protein interaction detection approach together with focused follow‐up experiments to study the function of the DeaD protein in Escherichia coli. In this method, functions are assigned to proteins based on the interactions they make with others in the living cell. The assigned functions are further confirmed using follow‐up experiments. The DeaD protein has been characterized in vitro as a putative prokaryotic factor required for the formation of translation initiation complexes on structured mRNAs. Although the RNA helicase activity of DeaD has been demonstrated in vitro, its in vivo activity remains controversial. Here, using a method called sequential peptide affinity (SPA) tagging, we show that DeaD interacts with certain ribosomal proteins as well as a series of other nucleic acid binding proteins. Focused follow‐up experiments provide evidence for the mRNA helicase activity of the DeaD protein complex during translation initiation. DeaD overexpression compensates for the reduction of the translation activity caused by a structure placed at the initiation region of a chloramphenicol acetyltransferase gene (cat) used as a reporter. Deletion of the deaD gene, encoding DeaD, abolishes the translation activity of the mRNA with an inhibitory structure at its initiation region. Increasing the growth temperature disrupts RNA secondary structures and bypasses the DeaD requirement. These observations suggest that DeaD is involved in destabilizing mRNA structures during translation initiation. This study also provides further confirmation that large‐scale protein–protein interaction data can be suitable to study protein functions in E. coli. J. Cell. Biochem. 100: 642–652, 2007. © 2006 Wiley‐Liss, Inc.</div>
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