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Histidyl-tRNA synthetase HisZ, C-terminal domain
HisZ is composed of two domains for the catalytic reaction and for anticodon binding. In contrast to other class-II aminoacyl-tRNA synthetases it lacks the essential editing domain. The C-terminal anicodon binding domain consists of three-stranded parallel beta-sheet flanked on each side with helices. (from Pfam)
ATP phosphoribosyltransferase regulatory subunit
This is a family of class II aminoacyl-tRNA synthetase-like and ATP phosphoribosyltransferase regulatory subunits. (from Pfam)
ATP phosphoribosyltransferase regulatory subunit is required for the first step of histidine biosynthesis
Apparant second copies of histidyl-tRNA synthetase, found in Bacillus subtilis, Synechocystis sp., Aquifex aeolicus, and others, are in fact a regulatory subunit of ATP phosphoribosyltransferase, and usually encoded by a gene adjacent to that encoding the catalytic subunit.
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