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pubmed-article:7782317pubmed:issue24lld:pubmed
pubmed-article:7782317pubmed:dateCreated1995-7-17lld:pubmed
pubmed-article:7782317pubmed:abstractTextThe elongation factor Tu (EF-Tu) is a member of the GTP/GDP-binding proteins and interacts with various partners during the elongation cycle of protein biosynthesis thereby mediating the correct binding of amino-acylated transfer RNA (aa-tRNA) to the acceptor site (A-site) of the ribosome. After GTP hydrolysis EF-Tu is released in its GDP-bound state. In vivo, EF-Tu is post-translationally modified by phosphorylation. Here we report that the phosphorylation of EF-Tu by a ribosome associated kinase activity is drastically enhanced by EF-Ts. The antibiotic kirromycin, known to block EF-Tu function, inhibits the modification. This effect is specific, since kirromycin-resistant mutants do become phosphorylated in the presence of the antibiotic. On the other hand, phosphorylated wild-type EF-Tu does not bind kirromycin. Most interestingly, the phosphorylation of EF-Tu abolishes its ability to bind aa-tRNA. In the GTP conformation the site of modification is located at the interface between domains 1 and 3 and is involved in a strong interdomain hydrogen bond. Introduction of a charged phosphate group at this position will change the interaction between the domains, leading to an opening of the molecule reminiscent of the GDP conformation. A model for the function of EF-Tu phosphorylation in protein biosynthesis is presented.lld:pubmed
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pubmed-article:7782317pubmed:authorpubmed-author:MestersJ RJRlld:pubmed
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pubmed-article:7782317pubmed:volume270lld:pubmed
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pubmed-article:7782317pubmed:authorsCompleteYlld:pubmed
pubmed-article:7782317pubmed:pagination14541-7lld:pubmed
pubmed-article:7782317pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:7782317pubmed:year1995lld:pubmed
pubmed-article:7782317pubmed:articleTitlePhosphorylation of elongation factor Tu prevents ternary complex formation.lld:pubmed
pubmed-article:7782317pubmed:affiliationInstitut für Biochemie, Freie Universität Berlin, Dahlem, Germany.lld:pubmed
pubmed-article:7782317pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:7782317pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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