Cloning and sequence analysis of a p40 structural protein gene of Helicoverpa zea nuclear polyhedrosis virus.
A gene encoding an occluded virion structural protein was isolated from an expression library constructed from the Helicoverpa zea S-type nuclear polyhedrosis virus (NPV) isolate HzS-15 using both polyclonal and monoclonal antibody screening. The gene was located within a Pstl-Sall fragment of the HzS-15 genome spanning from 96.5 to 97.3 m.u. Sequencing analyses revealed a long open reading frame of 927 nucleotides that predicted a protein of 37 kDa in size. Immunoblot analyses using the monoclonal antibody ENV409 demonstrated that the gene corresponded to a 40-kDa protein (p40) in SDS-polyacrylamide gels that was present exclusively in enveloped occluded virions but not in extracellular budded virions or envelope-stripped nucleocapsids. A p40 protein-specific transcript was detected at 16 hr postinfection in HzS-15-infected Hz 1075/UND-K cells and remained until 22 hr. Primer extension analyses demonstrated that the p40 protein-specific transcript started at -49 nucleotides from the ATG start codon within an ATAAG consensus pentamer found in late protein genes of Baculoviruses. The deduced amino acid sequence of the HzS-15 p40 protein gene shared 44 and 45% sequence homology with the p40 proteins of Bombyx mori NPV and Autographa californica NPV, respectively.
Department of Biological Sciences, University of Notre Dame, Indiana 46556.
S W
SW
Ma
B G
BG
Corsaro
P E
PE
Klebba
M J
MJ
Fraser
D000595:Amino Acid Sequence; D000911:Antibodies, Monoclonal; D016367:Baculoviridae / Q000235:genetics*; D001483:Base Sequence; D002478:Cells, Cultured; D003001:Cloning, Molecular; D004279:DNA, Viral / Q000235:genetics; D005814:Genes, Viral; D066298:In Vitro Techniques; D008969:Molecular Sequence Data; D017433:Protein Structure, Secondary; D015183:Restriction Mapping; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D012995:Solubility; D015678:Viral Structural Proteins / Q000235:genetics* / Q000276:immunology
D000911:Antibodies, Monoclonal; D004279:DNA, Viral; D015678:Viral Structural Proteins