Protein kinase doc

UniProtKB accession:  Q06259

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Toxic component of a type II toxin-antitoxin (TA) system (PubMed:18398006, PubMed:24141193). Phosphorylates EF-Tu on 'Thr-383' in vitro; can use ATP or GTP (PubMed:24141193). Also dephosphorylates in the presence of ADP or GDP. Can only phosphorylate before the ternary aminoacyl-tRNA EF-Tu-GTP complex is formed; interaction with cognate antitoxin phd prevents phosphorylation and dephosphorylation of EF-Tu. Overexpression results in inhibition of growth in liquid cultures and a decrease in colony formation by inhibiting translation, stabilizing mRNA and polysomes; these effects are overcome by concomitant expression of antitoxin phd. Binds 70S ribosomes and the 30S ribosomal subunits, the binding site is the same as for the antibiotic hygromycin B (PubMed:18398006). Bacteriophage P1 lysogenizes bacteria as a low-copy number plasmid; doc and phd proteins function in unison to stabilize plasmid number by inducing a lethal response to P1 plasmid prophage loss (PubMed:8411153). Overexpression of doc can induce the mRNA interferase activity of host RelE in vivo (PubMed:18757857).