TY - JOUR
T1 - Evidence for helical unwinding of an RNA substrate by the RNA enzyme RNase P
T2 - Use of an interstrand disulfide crosslink in substrate
AU - Krummel, Daniel A.Pomeranz
AU - Kent, Oliver
AU - MacMillan, Andrew M.
AU - Altman, Sidney
N1 - Funding Information:
Research in the laboratory of S.A. is supported by grants from the U.S. Public Health Service grant GM-19422 and the Human Frontier Science Program grant RG0291. D.A.P.K. acknowledges the support of an NIH pre-doctoral training grant to Yale University. Research in the laboratory of A.M.M. is supported by the Natural Sciences and Engineering Research Council of Canada. We thank Pat Fleming for his generous assistance in preparing Figure 3 .
PY - 2000/2/4
Y1 - 2000/2/4
N2 - To gain an understanding of structural changes induced in substrates by Escherichia coli ribonuclease P (RNase P), we have incorporated an interstrand disulfide crosslink proximal to the cleavage site in a model substrate. RNase P is able to process the reduced, non-crosslinked form of this substrate as well as a substrate in which the free thiol molecules have been alkylated with iodoacetamide. However, the oxidized, cross-linked form is cleaved at a significantly lower rate. Therefore, helical unwinding of the analog of the aminoacyl stem of the substrate near its site of cleavage may be necessary for efficient processing by E. coli RNase P. (C) 2000 Academic Press.
AB - To gain an understanding of structural changes induced in substrates by Escherichia coli ribonuclease P (RNase P), we have incorporated an interstrand disulfide crosslink proximal to the cleavage site in a model substrate. RNase P is able to process the reduced, non-crosslinked form of this substrate as well as a substrate in which the free thiol molecules have been alkylated with iodoacetamide. However, the oxidized, cross-linked form is cleaved at a significantly lower rate. Therefore, helical unwinding of the analog of the aminoacyl stem of the substrate near its site of cleavage may be necessary for efficient processing by E. coli RNase P. (C) 2000 Academic Press.
KW - Convertible nucleosides
KW - Disulfide crosslink
KW - M1 RNA
KW - Model substrates
KW - RNase P
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U2 - 10.1006/jmbi.1999.3424
DO - 10.1006/jmbi.1999.3424
M3 - Article
C2 - 10653690
AN - SCOPUS:0034602925
SN - 0022-2836
VL - 295
SP - 1113
EP - 1118
JO - Journal of molecular biology
JF - Journal of molecular biology
IS - 5
ER -