We have cloned the replicative form of the Periplaneta fuliginosa densonucleosis virus (PfDNV) genome and determined its complete sequence. The sequence has 5 454 nucleotides (nt), the genome consists of an internal u...We have cloned the replicative form of the Periplaneta fuliginosa densonucleosis virus (PfDNV) genome and determined its complete sequence. The sequence has 5 454 nucleotides (nt), the genome consists of an internal unique sequence flanked by inverted terminal repeats (201 nt). The first 122 nt at the 5’end and the terminal 122 nt at the 3’end of both plus and minus strands can fold into a typical hairpin structure. The genome contains seven major open reading frames (ORFs). The plus strand has 4 ORFs occupying the 5’half of the plus strand, whereas the others span the 5’ half of the minus strand. Two potential promoters were found at map units (m.u.) 3 and 97. Computer analysis of sequence homologies with other parvoviruses suggests that the plus strand of Pf DNV encodes very likely the nonstructural proteins and the minus strand probably encodes the structural proteins.展开更多
The vacuolar (H+)-ATPases (V-ATPases) are ATP-driven proton pumps with multiple functions in many organisms. In this study, we performed structural and functional analysis of vha55 gene that encodes V-ATPase subunit B...The vacuolar (H+)-ATPases (V-ATPases) are ATP-driven proton pumps with multiple functions in many organisms. In this study, we performed structural and functional analysis of vha55 gene that encodes V-ATPase subunit B in the smokybrown cockroach Periplaneta fuliginosa (Blattodea). We observed a high homology score of the deduced amino acid sequences between 10 species in seven orders. RNAi of the vha55 gene in R fuliginosa caused nymphal/nymphal molting defects with incomplete shedding of old cuticles, growth inhibition, as well as bent and wrinkled cuticles of thoraxes and abdominal segments. Since growth inhibition caused by vha55 RNAi did not interfere in the commencement of cockroach molting, molting timing and body growth might be controlled by independent mechanism. Our study suggested V-ATPases might be a good candidate molecule for evolutionary and developmental studies of insect molting.展开更多
The three-dimensional structure of Periplaneta fuliginosa densovirus (pfDNV) is determined at 2.3 nm reso-lution using the techniques of cryo-electron microscopy and image reconstruction. The pfDNV contains five struc...The three-dimensional structure of Periplaneta fuliginosa densovirus (pfDNV) is determined at 2.3 nm reso-lution using the techniques of cryo-electron microscopy and image reconstruction. The pfDNV contains five structural proteins and 60 protein subunits arranged on a T = 1 icosa-hedral shell with a relatively smooth surface. Its recon-struction reveals its distinct capsid structure from those ob-served in CPV and GmDNV. As in GmDNV, spike-like protrusions are not present in pfDNV at the threefold axes; while two small thorn-like protrusions are identified there. However, different from CPV and GmDNV, cylindrical channels along the fivefold axes are closed in pfDNV; while a small thorn-like protrusions, which have not been reported in other parvovirus, are observed there in pfDNV although their function is yet to be investigated. The pfDNV has dim-ple-like depressions at the icosahedral twofold axes; but has no canyon-like regions encircling the fivefold axes. The ico-sahedrally well-ordered nucleic acid has also been observed in pfDNV, suggesting that the protein and nucleic acid probably form closed interaction.展开更多
目的观察对家属楼居民户蟑螂的杀灭效果。方法用晔康杀蟑胶饵对单位家属楼室内,用拜力坦热烟雾对排水沟、暖气沟进行现场灭蟑实验。结果试验前现场室内蟑密度平均为15只/15 m in,施药后,10、20、30 d,平均密度分别为1.5,0,0只/15 m in,...目的观察对家属楼居民户蟑螂的杀灭效果。方法用晔康杀蟑胶饵对单位家属楼室内,用拜力坦热烟雾对排水沟、暖气沟进行现场灭蟑实验。结果试验前现场室内蟑密度平均为15只/15 m in,施药后,10、20、30 d,平均密度分别为1.5,0,0只/15 m in,杀灭率分别为90.0%,100%,100%。经6个月观察各房间均未见活蟑。结论晔康杀蟑胶饵对家属楼居民户灭蟑效果理想,拜力坦热烟雾对排水沟、暖气沟灭蟑效果理想,并能达到较长时间的控制目的。展开更多
A luciferase gene has been inserted into the recombinant plasmid PfDNV-pUC119 which contained partly deletion of genome of Periplanete fuliginosa densovirus (PfDNV). The recombinant plasmid with luciferase gene was co...A luciferase gene has been inserted into the recombinant plasmid PfDNV-pUC119 which contained partly deletion of genome of Periplanete fuliginosa densovirus (PfDNV). The recombinant plasmid with luciferase gene was co-transfected with pfDNV-pUC119 into Periplanele fuliginosa larvae and had a high luciferase gene expression in enteron of the transfected larvae.展开更多
文摘We have cloned the replicative form of the Periplaneta fuliginosa densonucleosis virus (PfDNV) genome and determined its complete sequence. The sequence has 5 454 nucleotides (nt), the genome consists of an internal unique sequence flanked by inverted terminal repeats (201 nt). The first 122 nt at the 5’end and the terminal 122 nt at the 3’end of both plus and minus strands can fold into a typical hairpin structure. The genome contains seven major open reading frames (ORFs). The plus strand has 4 ORFs occupying the 5’half of the plus strand, whereas the others span the 5’ half of the minus strand. Two potential promoters were found at map units (m.u.) 3 and 97. Computer analysis of sequence homologies with other parvoviruses suggests that the plus strand of Pf DNV encodes very likely the nonstructural proteins and the minus strand probably encodes the structural proteins.
文摘The vacuolar (H+)-ATPases (V-ATPases) are ATP-driven proton pumps with multiple functions in many organisms. In this study, we performed structural and functional analysis of vha55 gene that encodes V-ATPase subunit B in the smokybrown cockroach Periplaneta fuliginosa (Blattodea). We observed a high homology score of the deduced amino acid sequences between 10 species in seven orders. RNAi of the vha55 gene in R fuliginosa caused nymphal/nymphal molting defects with incomplete shedding of old cuticles, growth inhibition, as well as bent and wrinkled cuticles of thoraxes and abdominal segments. Since growth inhibition caused by vha55 RNAi did not interfere in the commencement of cockroach molting, molting timing and body growth might be controlled by independent mechanism. Our study suggested V-ATPases might be a good candidate molecule for evolutionary and developmental studies of insect molting.
基金supporled by the National Natural Science Foundation of China(Grant No.39470032)
文摘The three-dimensional structure of Periplaneta fuliginosa densovirus (pfDNV) is determined at 2.3 nm reso-lution using the techniques of cryo-electron microscopy and image reconstruction. The pfDNV contains five structural proteins and 60 protein subunits arranged on a T = 1 icosa-hedral shell with a relatively smooth surface. Its recon-struction reveals its distinct capsid structure from those ob-served in CPV and GmDNV. As in GmDNV, spike-like protrusions are not present in pfDNV at the threefold axes; while two small thorn-like protrusions are identified there. However, different from CPV and GmDNV, cylindrical channels along the fivefold axes are closed in pfDNV; while a small thorn-like protrusions, which have not been reported in other parvovirus, are observed there in pfDNV although their function is yet to be investigated. The pfDNV has dim-ple-like depressions at the icosahedral twofold axes; but has no canyon-like regions encircling the fivefold axes. The ico-sahedrally well-ordered nucleic acid has also been observed in pfDNV, suggesting that the protein and nucleic acid probably form closed interaction.
基金This work was supported jointly by the Program of Action sponsored by the Ministry of Education/Hunan Provincial Program for Construction of the Key Subjects during the Tenth Five-Year Planperiod.
文摘目的观察对家属楼居民户蟑螂的杀灭效果。方法用晔康杀蟑胶饵对单位家属楼室内,用拜力坦热烟雾对排水沟、暖气沟进行现场灭蟑实验。结果试验前现场室内蟑密度平均为15只/15 m in,施药后,10、20、30 d,平均密度分别为1.5,0,0只/15 m in,杀灭率分别为90.0%,100%,100%。经6个月观察各房间均未见活蟑。结论晔康杀蟑胶饵对家属楼居民户灭蟑效果理想,拜力坦热烟雾对排水沟、暖气沟灭蟑效果理想,并能达到较长时间的控制目的。
文摘A luciferase gene has been inserted into the recombinant plasmid PfDNV-pUC119 which contained partly deletion of genome of Periplanete fuliginosa densovirus (PfDNV). The recombinant plasmid with luciferase gene was co-transfected with pfDNV-pUC119 into Periplanele fuliginosa larvae and had a high luciferase gene expression in enteron of the transfected larvae.
