Kinetic analysis of precursor M1 RNA molecules for exploring substrate specificity of the N-terminal catalytic half of RNase E.
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.
Kim
Kwang-sun
KS
Department of Chemistry and Center for Molecular Design and Synthesis, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.
Sim
Soyeong
S
Ko
Jae-hyeong
JH
Cho
Bongrae
B
Lee
Younghoon
Y
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
D012322:RNA Precursors; D016337:RNA, Catalytic; D012333:RNA, Messenger; D011994:Recombinant Proteins; D004722:Endoribonucleases; C022537:ribonuclease E