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The Avi.groEL intron of Azotobacter vinelandii, which interrupts the termination codon of the groEL gene, is shown to belong to a monophyletic subset of bacterial group II introns that share a large insertion at their 5′ extremity and a peculiar genetic localization. Some of these introns are inserted within, right next to, or very close to, a stop codon while others are located immediately 3′ of,...
The universally conserved endoribonuclease P consists of one RNA subunit and, depending on its origin, a variable number of protein subunits. RNase P is involved in the processing of a large variety of substrates in the cell, the preferred substrate being tRNA precursors. Cleavage activity does not require the presence of the protein subunit(s) in vitro. This is true for both prokaryotic and eukaryotic...
Ribonuclease P (RNase P) is a ribonucleoprotein enzyme that generates the mature 5′ ends of tRNAs. Ubiquitous across all three kingdoms of life, the composition and functional contributions of the RNA and protein components of RNase P differ between the kingdoms. RNA-alone catalytic activity has been reported throughout bacteria, but only for some archaea, and only as trace activity for eukarya. Available...
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