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Functional Characterization of the Ecdysteroid UDP-glucosyl Transferase Gene of Helicoverpa armigera Single-enveloped Nucleopolyhedrovirus Isolated in South Africa

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Abstract

The ecdysteroid UDP-glucosyltransferase (egt) gene of a single enveloped nucleopolyhedrovirus was located using an Hz-SNPV gene-specific probe. This SNPV was found infecting a colony of Helicoverpa armigera (HaSNPV) in the Western Cape region of South Africa. The open reading frame of the HaSNPV-SA egt is 1.548 nucleotides long and encodes a predicted protein of 516 amino acids with a M r of 58,897-kDa. The 5′-noncoding region contained an early transcription initiation motif (CAGT) and a baculovirus late transcription motif (ATAAG). A transcription enhancer sequence (GATA) was also identified. Two possible TATA boxes together with am AT rich region were also recognized. A putative signal peptide of 20 residues was present at the N-terminus of the predicted EGT sequence. A polyadenylation signal (AATAAA) was found downstream of the translation stop codon. Five Helicoverpa NPV EGT's that have an extremely high degree of nucleotide and amino acid sequence homology were used in this study. Single nucleotide polymorphisms (SNPs) within the gene were tabulated. The Helicoverpa NPV egts seem to be closely related to the egt genes of Mamestra configurata NPV (MacoNPV), Buzura suppressaria NPV (BusuSNPV) and Spodoptera exigua NPV (SeMNPV) with amino acid identities of approximately 50%. The Helicoverpa NPV EGTs show ten conserved motifs with other EGTs. A phylogenetic tree of 27 baculovirus EGTs and a human UDP-glucoronosyltransferase was constructed using Neighbour-joining within CLUSTAL X. That a secreted and active EGT is encoded by HaSNPV-SA was confirmed by assay of infected cell culture medium.

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Authors and Affiliations

  1. Department of Biotechnology, University of the Western Cape, Modderdam Road, Bellville, 7535, Cape Town, South Africa

    Sehaam Khan, Burtram Fielding & Sean Davison

  2. Biomedical Technology, Faculty of Applied Sciences, Cape Technikon, Sciences Building, Tennant Street, P.O. Box 652, Cape Town, South Africa

    Sehaam Khan

  3. Department of Microbiology, University of Otago, P.O. Box 56, Dunedin, New Zealand

    Kate Sneddon & Vernon V. Ward

Authors
  1. Sehaam Khan
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  2. Kate Sneddon
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  3. Burtram Fielding
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  4. Vernon V. Ward
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  5. Sean Davison
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Correspondence to Sean Davison.

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Khan, S., Sneddon, K., Fielding, B. et al. Functional Characterization of the Ecdysteroid UDP-glucosyl Transferase Gene of Helicoverpa armigera Single-enveloped Nucleopolyhedrovirus Isolated in South Africa. Virus Genes 27, 17–27 (2003). https://doi.org/10.1023/A:1025116301321

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