Ribozyme mediated targeting of cucumber mosaic virus RNA 1 and 2 in transgenic tobacco plants.
Hammerhead ribozymes have been extensively used to inhibit the expression of cellular genes or viral genes mainly in the animal study. In this study, we designed a ribozyme targeting the conserved leader sequences of cucumber mosaic virus (CMV) RNA 1 and 2. The ribozyme, with asymmetric lengths of flanking complementary regions, cleaved a model substrate RNA efficiently at 26 degrees C as well as at 37 degrees C or 50 degrees C in vitro. And the ribozyme encoding sequence was introduced into tobacco plants and expressed with the CaMV 35S promoter and 3' NOS terminator in a monomeric type (pBIR1), tandemly repeated type (pBIR3), and cotranscriptionally combined type (pRokR) with 2.2 copies of I17N satellite RNA. Virus challenging experiments in F1 plants of respective transformants with CMV-Y showed specific reductions of viral RNA 1 and 2 in comparison with RNA 3 or 4. Although young plants of a three-leaf-stage showed rather similar mild symptom attenuations in all constructions compared to CMV-Y inoculated wild type, fully grown plants showed a differential degree of resistance upon systemic infections of CMV-Y in pRokR, pBIR3 and pBIR1 transformed plants in a decreasing order.
Kwon
C S
CS
Graduate School of Biotechnology, Korea University, Seoul, Korea.
Chung
W I
WI
Paek
K H
KH
D016960:Agrobacterium tumefaciens / Q000235:genetics; D001483:Base Sequence; D017799:Cucumovirus / Q000235:genetics*; D017931:DNA Primers / Q000235:genetics; D018390:Gene Targeting; D005822:Genetic Vectors; D030821:Plants, Genetically Modified; D010947:Plants, Toxic; D010957:Plasmids / Q000235:genetics; D016337:RNA, Catalytic / Q000235:genetics*; D019244:RNA, Satellite / Q000235:genetics; D012367:RNA, Viral / Q000235:genetics*; D014026:Nicotiana / Q000235:genetics* / Q000821:virology*; D014170:Transformation, Genetic
D017931:DNA Primers; D016337:RNA, Catalytic; D019244:RNA, Satellite; D012367:RNA, Viral