title: Kinetic analysis of precursor M1 RNA molecules for exploring substrate specificity of the N-terminal catalytic half of RNase E.
abstract: To gain insight into the mechanism by which the sequence at the rne-dependent site of substrate RNA affects the substrate specificity of Escherichia coli RNase E, we performed kinetic analysis of the cleavage of precursor M1 RNA molecules containing various sequences at the rne-dependent site by the N-terminal catalytic half of RNase E (NTH-RNase E). NTH-RNase E displayed higher K(m) and k(cat) values for more specific substrates. The retention of single strandedness at the rne-dependent site was essential for cleavage efficiency. Moreover, the loss of single-strandedness was accompanied by a decrease in both the K(m) and k(cat) values.
authors.affiliation: Department of Chemistry and Center for Molecular Design and Synthesis, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.
authors.forename: Kwang-sun
authors.initials: KS
authors.lastname: Kim
authors.forename: Soyeong
authors.initials: S
authors.lastname: Sim
authors.forename: Jae-hyeong
authors.initials: JH
authors.lastname: Ko
authors.forename: Bongrae
authors.initials: B
authors.lastname: Cho
authors.forename: Younghoon
authors.initials: Y
authors.lastname: Lee
mesh_terms: D004722:Endoribonucleases / Q000235:genetics / Q000378:metabolism*; D004926:Escherichia coli / Q000201:enzymology; D014644:Genetic Variation; D007700:Kinetics; D009690:Nucleic Acid Conformation; D012322:RNA Precursors / Q000737:chemistry / Q000378:metabolism*; D016337:RNA, Catalytic / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D013379:Substrate Specificity; D013997:Time Factors
chemical_list: D012322:RNA Precursors; D016337:RNA, Catalytic; D012333:RNA, Messenger; D011994:Recombinant Proteins; D004722:Endoribonucleases; C022537:ribonuclease E