Ribonuclease P. Postscript

Ribonuclease P.

The gene coding for the RNA subunit of ribonuclease P (RNase P) is essential in all free-living organisms. The RNA subunit, itself, is an enzyme and, from its evolutionary tree, we can infer that it is a very ancient molecule. The specificity of this enzyme is that it cleaves other RNA molecules at the junction of single-stranded and the 5' end of double-stranded regions of RNA. One can specula...

The Ribonuclease P Database

Ribonuclease P is the endoribonuclease responsible for the removal of leader sequences from tRNA precursors. Ribonuclease P is a ribonucleoprotein, and in bacteria the RNA alone is capable of pre-tRNA processing in vitro, i.e. it is a catalytic RNA. The Ribonuclease P Database is a compilation of ribonuclease P sequences, sequence alignments, secondary structures, three-dimensional models and a...

Postscript

Archaeal Ribonuclease P Has Multiple Protein Subunits Homologous to Eukaryotic Nuclear Ribonuclease P Subunits

HALL, THOMAS A. Archaeal Ribonuclease P has Multiple Protein Subunits Homologous to Eukaryotic Nuclear Ribonuclease P Subunits (Under the direction of James W. Brown.) RNase P removes the 5 ́ leader from all transfer RNA precursors, and is thus a required factor for protein synthesis. RNase P consists of a catalytic RNA molecule and associated protein, the amount of which varies among phylogenet...

Better PostScript than PostScript: portable self-extracting PostScript representation of scanned document images

We present a Pattern Matching Based Compression (PMBC) system which compresses scanned documents into PostScript format. The output of a PMBC system is a pattern library, or font, and a series of pattern indices and positions. PMBC represents scanned documents in the same way that word processing programs represent their output pages. We explore various PostScript representations of this output...