Analysis of crosslinked complexes of M1 RNA, the catalytic RNA subunit
of ribonuclease P from Escherichia coli, and transfer RNA precursor substrates has led to the identification of regions in the enzyme and in the substrate that are in close physical proximity to each other.
The picture that emerges from the work is
of ribonucleases patrolling our bodies, looking for telltales of cancer cells, Raines says.
Areas of emphasis include the roles
of ribonucleases and RNA - binding proteins and assembly of the carbon - fixing enzyme Rubisco.
Not exact matches
Standard laboratory DNA isolation methods, such as sonication,
ribonuclease (RNase) treatment, and ethanol precipitation may reduce the available pool
of DNA enough to prevent recovering usable sequences from the oldest samples.
The most efficient EGSs form transfer RNA precursor - like structures with the target RNA, in which the analog
of the anticodon stem has been disrupted, an indication that selection for the optimal substrate for
ribonuclease P yields an RNA structure different from that
of present - day transfer RNA precursors.
Any RNA, when in a complex with another oligoribonucleotide known as an external guide sequence (EGS), can become a substrate for
ribonuclease P. Simulation
of evolution in vitro was used to select EGSs that bind tightly to a target substrate messenger RNA and that increase the efficiency
of cleavage
of the target by human
ribonuclease P to a level equal to that achieved with natural substrates.
Ribonuclease P (RNase P) from Escherichia coli or its catalytic RNA subunit can efficiently cleave small RNA substrates that lack the conserved features
of natural substrates
of RNase P if an additional small RNA is also present.
M1 RNA, the catalytic RNA subunit
of Escherichia coli
ribonuclease P, can cleave novel transfer RNA (tRNA) precursors that lack specific domains
of the normal tRNA sequence.
Bernstein et al. «Role for A Bidentate
Ribonuclease in the Initiation Step
of RNA Interference», Nature, 409: 363 - 366, 2001.
Crystal structures
of the reverse transcriptase - associated
ribonuclease H domain
of xenotropic murine leukemia - virus related virus
A fluorescence - based high - throughput screening assay for inhibitors
of human immunodeficiency virus - 1 reverse transcriptase - associated
ribonuclease H activity