scholarly journals The complete sequence of the Cydia pomonella granulovirus genome

2001 ◽  
Vol 82 (10) ◽  
pp. 2531-2547 ◽  
Author(s):  
Teresa Luque ◽  
Ruth Finch ◽  
Norman Crook ◽  
David R. O’Reilly ◽  
Doreen Winstanley
Keyword(s):  
Cydia Pomonella ◽  
Protein Tyrosine Phosphatases ◽  
Complete Sequence ◽  
Autographa Californica ◽  
Glycoprotein Gene ◽  
Repeat Sequences ◽  
Budded Virus ◽  
Cydia Pomonella Granulovirus ◽  
High Level ◽  
Imperfect Palindrome

The nucleotide sequence of the DNA genome of Cydia pomonella granulovirus (CpGV) was determined and analysed. The genome is composed of 123500 bp and has a G+C content of 45·2%. It contains 143 ORFs of 150 nucleotides or more that show minimal overlap. One-hundred-and-eighteen (82·5%) of these putative genes are homologous to genes previously identified in other baculoviruses. Among them, 73 are homologous to genes of Autographa californica nucleopolyhedrovirus (AcMNPV), whereas 108 and 98 are homologous to genes of Xestia c-nigrum GV (XcGV) and Plutella xylostella GV (PxGV), respectively. These homologues show on average 37·4% overall amino acid sequence identity to those from AcMNPV and 45% to those from XcGV and PxGV. The CpGV gene content was compared to that of other baculoviruses. Several genes reported to have major roles in baculovirus biology were not found in the CpGV genome, such as gp64, the major budded virus glycoprotein gene in some nucleopolyhedroviruses, and lef-7, involved in DNA replication. However, the CpGV genome encodes the large and small subunits of ribonucleotide reductase, three inhibitor of apoptosis (iap) homologues and two protein tyrosine phosphatases. The CpGV, PxGV and XcGV genomes present a noticeably high level of conservation of gene order and orientation. A striking feature of the CpGV genome is the absence of typical homologous repeat sequences. However, it contains one major repeat region and 13 copies of a single 73–77 bp imperfect palindrome.

scholarly journals Virulence and competitiveness of Cydia pomonella granulovirus mutants: parameters that do not match

2005 ◽  
Vol 86 (10) ◽  
pp. 2731-2738 ◽  
Author(s):  
Hugo M. Arends ◽  
Doreen Winstanley ◽  
Johannes A. Jehle
Keyword(s):  
Population Dynamics ◽  
Cydia Pomonella ◽  
Virus Production ◽  
Virus Population ◽  
Naturally Occurring ◽  
Direct Competition ◽  
Virus Genotypes ◽  
Occlusion Bodies ◽  
Budded Virus ◽  
Cydia Pomonella Granulovirus

The LD50, median survival time (ST50) and virus production are virulence parameters that are commonly used to describe the biological characteristics of viruses. In this study, these parameters were determined for Cydia pomonella granulovirus (CpGV-M) and two naturally occurring mutants (CpGV-MCp4 and -MCp5) that carry Tc1-like insect transposable elements. The three virus genotypes were similar in their LD50, ST50 and virus production. However, the mutant genotypes MCp4 and MCp5 were very effectively out-competed by CpGV-M in direct competition experiments, where Cydia pomonella larvae were co-infected with known ratios of occlusion bodies or budded virus of CpGV-M and one of the two mutants. It was demonstrated that MCp5 and MCp4 could not be sustained in the virus population when the progeny viruses of different co-infections were used as inocula to infect next passage larvae. These results show that the virulence parameters LD50, ST50 and virus production alone do not adequately reflect the competitiveness of the virus and are thus not suitable to describe virus population dynamics.

scholarly journals Sequence and organization of the Spodoptera exigua multicapsid nucleopolyhedrovirus genome

1999 ◽  
Vol 80 (12) ◽  
pp. 3289-3304 ◽  
Author(s):  
Wilfred F. J. IJkel ◽  
Elisabeth A. van Strien ◽  
Jacobus G. M. Heldens ◽  
René Broer ◽  
Douwe Zuidema ◽  
...  
Keyword(s):  
Spodoptera Exigua ◽  
Autographa Californica ◽  
Recent Common Ancestor ◽  
Computer Assisted ◽  
Glycoprotein Gene ◽  
Orgyia Pseudotsugata ◽  
Group I ◽  
Group Ii ◽  
Budded Virus ◽  
Assisted Analysis

The nucleotide sequence of the DNA genome of Spodoptera exigua multicapsid nucleopolyhedrovirus (SeMNPV), a group II NPV, was determined and analysed. The genome contains 135611 bp and has a G+C content of 44 mol%. Computer-assisted analysis revealed 139 ORFs of 150 nucleotides or larger; 103 have homologues in Autographa californica MNPV (AcMNPV) and a further 16 have homologues in other baculoviruses. Twenty ORFs are unique to SeMNPV. Major differences in SeMNPV gene content and arrangement were found compared with the group I NPVs AcMNPV, Bombyx mori (Bm) NPV and Orgyia pseudotsugata (Op) MNPV and the group II NPV Lymantria dispar (Ld) MNPV. Eighty-five ORFs were conserved among all five baculoviruses and are considered as candidate core baculovirus genes. Two putative p26 and odv-e66 homologues were identified in SeMNPV, each of which appeared to have been acquired independently and not by gene duplication. The SeMNPV genome lacks homologues of the major budded virus glycoprotein gene gp64, the immediate-early transactivator ie-2 and bro (baculovirus repeat ORF) genes that are found in AcMNPV, BmNPV, OpMNPV and LdMNPV. Gene parity analysis of baculovirus genomes suggests that SeMNPV and LdMNPV have a recent common ancestor and that they are more distantly related to the group I baculoviruses AcMNPV, BmNPV and OpMNPV. The orientation of the SeMNPV genome is reversed compared with the genomes of AcMNPV, BmNPV, OpMNPV and LdMNPV. However, the gene order in the ‘central’ part of baculovirus genomes is highly conserved and appears to be a key feature in the alignment of baculovirus genomes.

scholarly journals Autographa californica Nucleopolyhedrovirus AC141 (Exon0), a Potential E3 Ubiquitin Ligase, Interacts with Viral Ubiquitin and AC66 To Facilitate Nucleocapsid Egress

2017 ◽  
Vol 92 (3) ◽  
Author(s):  
Siddhartha Biswas ◽  
Leslie G. Willis ◽  
Minggang Fang ◽  
Yingchao Nie ◽  
David A. Theilmann
Keyword(s):  
Ubiquitin Ligase ◽  
Nuclear Export ◽  
Molecular Mechanisms ◽  
Nuclear Periphery ◽  
E3 Ubiquitin Ligase ◽  
Autographa Californica ◽  
Nucleocapsid Proteins ◽  
Systemic Spread ◽  
Autographa Californica Nucleopolyhedrovirus ◽  
Budded Virus

ABSTRACTDuring the infection cycle of Autographa californica multiple nucleopolyhedrovirus (AcMNPV), two forms of virions are produced, budded virus (BV) and occlusion-derived virus (ODV). Nucleocapsids that form BV have to egress from the nucleus, whereas nucleocapsids that form ODV remain inside the nucleus. The molecular mechanism that determines whether nucleocapsids remain inside or egress from the nucleus is unknown. AC141 (a predicted E3 ubiquitin ligase) and viral ubiquitin (vUbi) have both been shown to be required for efficient BV production. In this study, it was hypothesized that vUbi interacts with AC141, and in addition, that this interaction was required for BV production. Deletion of bothac141andvubirestricted viral infection to a single cell, and BV production was completely eliminated. AC141 was ubiquitinated by either vUbi or cellular Ubi, and this interaction was required for optimal BV production. Nucleocapsids in BV, but not ODV, were shown to be specifically ubiquitinated by vUbi, including a 100-kDa protein, as well as high-molecular-weight conjugates. The viral ubiquitinated 100-kDa BV-specific nucleocapsid protein was identified as AC66, which is known to be required for BV production and was shown by coimmunoprecipitation and mass spectrometry to interact with AC141. Confocal microscopy also showed that AC141, AC66, and vUbi interact at the nuclear periphery. These results suggest that ubiquitination of nucleocapsid proteins by vUbi functions as a signal to determine if a nucleocapsid will egress from the nucleus and form BV or remain in the nucleus to form ODV.IMPORTANCEBaculoviruses produce two types of virions called occlusion-derived virus (ODV) and budded virus (BV). ODVs are required for oral infection, whereas BV enables the systemic spread of virus to all host tissues, which is critical for killing insects. One of the important steps for BV production is the export of nucleocapsids out of the nucleus. This study investigated the molecular mechanisms that enable the selection of nucleocapsids for nuclear export instead of being retained within the nucleus, where they would become ODV. Our data show that ubiquitination, a universal cellular process, specifically tags nucleocapsids of BV, but not those found in ODV, using a virus-encoded ubiquitin (vUbi). Therefore, ubiquitination may be the molecular signal that determines if a nucleocapsid is destined to form a BV, thus ensuring lethal infection of the host.

High stability and no fitness costs of the resistance of codling moth to Cydia pomonella granulovirus (CpGV-M)

2012 ◽  
Vol 111 (2) ◽  
pp. 136-142 ◽  
Author(s):  
Karin Undorf-Spahn ◽  
Eva Fritsch ◽  
Jürg Huber ◽  
Jutta Kienzle ◽  
Claus P.W. Zebitz ◽  
...  
Keyword(s):  
High Stability ◽  
Cydia Pomonella ◽  
Codling Moth ◽  
Fitness Costs ◽  
Cydia Pomonella Granulovirus

scholarly journals Molecular biology of baculovirus and its use in biological control in Brazil

1999 ◽  
Vol 34 (10) ◽  
pp. 1733-1761 ◽  
Author(s):  
Maria Elita Batista de Castro ◽  
Marlinda Lobo de Souza ◽  
William Sihler ◽  
Júlio Carlyle Macedo Rodrigues ◽  
Bergmann Morais Ribeiro
Keyword(s):  
Molecular Biology ◽  
Recombinant Dna ◽  
Host Cells ◽  
Virus Propagation ◽  
Viral Particles ◽  
Occlusion Bodies ◽  
Budded Virus ◽  
Recombinant Dna Techniques ◽  
High Level ◽  
Eukaryotic Organisms

Baculoviruses are insect viruses found mainly in Lepidoptera. The family Baculoviridae is taxonomically divided in two genera, Nucleopolyhedrovirus and Granulovirus, which differ by occlusion body morphology. NPVs (Nucleopolyhedroviruses) have polyhedrical inclusion bodies (PIBs) containing multiple viral particles, while GVs (Granuloviruses) appear to be generally single particles occluded in oval shaped occlusion bodies. During the life cycle, two different viral progenies are produced: BV (Budded Virus) and PDV (Polyhedra Derived Virus), which are essential for the infectious process and virus propagation in host cells. Baculoviruses are being used for pest control and they are especially safe due to their specificity and invertebrate-restricted host range. Baculoviruses have been used as vectors for high level protein expression ofheterologous genes from prokaryotic and eukaryotic organisms. Also, recombinant DNA techniques have allowed the production of genetically modified viral insecticides. This study is a review on the taxonomy, structure, replication and molecular biology of baculoviruses, as well as their use as bioinsecticides in Brazil.

scholarly journals Characterization of Two Autographa californica Nucleopolyhedrovirus Proteins, Ac145 and Ac150, Which Affect Oral Infectivity in a Host-Dependent Manner

2004 ◽  
Vol 78 (12) ◽  
pp. 6439-6448 ◽  
Author(s):  
Renee Lapointe ◽  
Holly J. R. Popham ◽  
Ursula Straschil ◽  
David Goulding ◽  
David R. O'Reilly ◽  
...  
Keyword(s):  
Trichoplusia Ni ◽  
Polyclonal Antibodies ◽  
Heliothis Armigera ◽  
Autographa Californica ◽  
Dependent Manner ◽  
Significant Drop ◽  
Double Deletion ◽  
Autographa Californica Nucleopolyhedrovirus ◽  
Budded Virus ◽  
Nuclear Polyhedrosis

ABSTRACT The genome of the baculovirus Autographa californica nuclear polyhedrosis virus (AcMNPV) contains two homologues, orf145 and orf150, of the Heliothis armigera Entomopoxvirus (HaEPV) 11,000-kDa gene. Polyclonal antibodies raised against the Ac145 or Ac150 protein were utilized to demonstrate that they are expressed from late to very late times of infection and are within the nuclei of infected Sf-21 cells. Transmission electron microscopy coupled with immunogold labeling of Ac145 found this protein within the nucleus in areas of nucleocapsid assembly and maturation, along with some association with the enveloped bundles of virions within the developing occlusion bodies (OBs). Ac150 was found to be mainly associated with enveloped bundles of virions within OBs and also with those not yet occluded. Both Ac145 and Ac150 were found to be present in budded virus as well as OBs. Both orf145 and orf150 were deleted from the AcMNPV genome, singly or together, and these deletion mutants were assessed for oral infectivity both in Trichoplusia ni and Heliothis virescens larvae. Deletion of Ac145 led to a small but significant drop in infectivity (sixfold) compared to wild-type (wt) AcMNPV for T. ni but not for H. virescens. Deletion of Ac150 alone had no effect on infectivity of the virus for either host. However, deletion of both Ac145 and Ac150 gave a recombinant virus with a drastic (39-fold) reduction in infectivity compared to wt virus for H. virescens. Intrahemocoelic injection of budded virus from the double-deletion virus into H. virescens larvae is as infectious to this host as wt budded virus, indicating that Ac145 and Ac150 play a role in primary oral infection of AcMNPV, the extent of which is host dependent.

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