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- W2604201211 abstract "Archaeosine (G⁺) is a structurally complex modified nucleoside ubiquitous to the Archaea, where it is found in the D-loop of virtually all archaeal transfer RNA (tRNA). Its unique structure, which includes a formamidine group that carries a formal positive charge, and location in the tRNA, led to the proposal that it serves a key role in stabilizing tRNA structure. Although G⁺ is limited to the Archaea, it is structurally related to the bacterial modified nucleoside queuosine, and the two share homologous enzymes for the early steps of their biosynthesis. In the Euryarchaeota, the last step of the archaeosine biosynthetic pathway involves the amidation of a nitrile group on an archaeosine precursor to give formamidine, a reaction catalyzed by the enzyme Archaeosine Synthase (ArcS). Most Crenarchaeota lack ArcS, but possess two proteins that inversely distribute with ArcS and each other, and are implicated in G⁺ biosynthesis. Here, we describe biochemical studies of one of these, the protein QueF-like (QueF-L) from Pyrobaculum calidifontis, that demonstrate the catalytic activity of QueF-L, establish where in the pathway QueF-L acts, and identify the source of ammonia in the reaction." @default.
- W2604201211 created "2017-04-14" @default.
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- W2604201211 date "2017-04-06" @default.
- W2604201211 modified "2023-10-16" @default.
- W2604201211 title "QueF-Like, a Non-Homologous Archaeosine Synthase from the Crenarchaeota" @default.
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- W2604201211 doi "https://doi.org/10.3390/biom7020036" @default.
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