Studies on the mechanism of inhibition of bacterial ribonuclease P by aminoglycoside derivatives.
Studies on the mechanism of inhibition of bacterial ribonuclease P by aminoglycoside derivatives.
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DOI:
10.1093/nar/gkm1088
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发表时间:
2008-02
影响因子:
14.9
通讯作者:
Gopalan V
中科院分区:
文献类型:
--
作者:
Kawamoto SA;Sudhahar CG;Hatfield CL;Sun J;Behrman EJ;Gopalan V
Ribonuclease P (RNase P) is a Mg2+-dependent endoribonuclease responsible for the 5′-maturation of transfer RNAs. It is a ribonucleoprotein complex containing an essential RNA and a varying number of protein subunits depending on the source: at least one, four and nine in Bacteria, Archaea and Eukarya, respectively. Since bacterial RNase P is required for viability and differs in structure/subunit composition from its eukaryal counterpart, it is a potential antibacterial target. To elucidate the basis for our previous finding that the hexa-arginine derivative of neomycin B is 500-fold more potent than neomycin B in inhibiting bacterial RNase P, we synthesized hexa-guanidinium and -lysyl conjugates of neomycin B and compared their inhibitory potential. Our studies indicate that side-chain length, flexibility and composition cumulatively account for the inhibitory potency of the aminoglycoside-arginine conjugates (AACs). We also demonstrate that AACs interfere with RNase P function by displacing Mg2+ ions. Moreover, our finding that an AAC can discriminate between a bacterial and archaeal (an experimental surrogate for eukaryal) RNase P holoenzyme lends promise to the design of aminoglycoside conjugates as selective inhibitors of bacterial RNase P, especially once the structural differences in RNase P from the three domains of life have been established.
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