A conserved RNA motif involved in divalent cation utilization by nuclear RNase P.
Catalytic RNAs are metalloenzymes that require precise coordination of divalent cation cofactors. In RNase P RNA, a conserved structural subdomain that has been implicated in magnesium coordination contains the consensus sequence acAGaRA. Randomization mutagenesis of the analogous sequence in the Saccharomyces cerevisiae nuclear RNase P RNA gene, RPR1, gave viable sequence variants that confer magnesium-correctable growth defects and are defective in magnesium cofactor utilization by the RNase P holoenzyme in vitro. Kinetic analysis of the defective holoenzymes suggests that the primary effects were on catalytic rate, rather than substrate recognition. The possible involvement of this RNA subdomain in catalysis is discussed.
Department of Biological Chemistry, The University of Michigan, Ann Arbor 48109-0606, USA.
E
E
Pagán-Ramos
Y
Y
Lee
D R
DR
Engelke
D001483:Base Sequence; D002384:Catalysis; D017124:Conserved Sequence; D004722:Endoribonucleases / Q000235:genetics* / Q000378:metabolism*; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D029968:Escherichia coli Proteins; D019143:Evolution, Molecular; D005800:Genes, Fungal; D007700:Kinetics; D008274:Magnesium / Q000378:metabolism*; D008969:Molecular Sequence Data; D016296:Mutagenesis; D009690:Nucleic Acid Conformation; D012323:RNA Processing, Post-Transcriptional; D016337:RNA, Catalytic / Q000235:genetics* / Q000378:metabolism*; D012331:RNA, Fungal / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D043262:Ribonuclease P; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism
D029968:Escherichia coli Proteins; D016337:RNA, Catalytic; D012331:RNA, Fungal; D004722:Endoribonucleases; D043262:Ribonuclease P; C470865:ribonuclease P, E coli; D008274:Magnesium