当前位置： SCI文献检索 > JOURNAL OF BIOTECHNOLOGY期刊下所有文献 > Trans-complementation of polyhedrin by a stably transformed Sf9 insect cell line allows occ- baculovirus occlusion and larval per os infectivity.

Trans-complementation of polyhedrin by a stably transformed Sf9 insect cell line allows occ- baculovirus occlusion and larval per os infectivity.

Abstract：

:Oral infection of insect larvae with baculovirus is an advantageous methodology for producing high levels of recombinant proteins and for achieving plague control. However, many recombinant baculoviruses express a foreign protein in lieu of the polyhedrin and hence do not form occlusion bodies (occ-), resulting in extremely reduced per os infectivity in larvae. To overcome this limitation, stably transformed insect cell lines expressing polyhedrin capable of occluding occ- recombinant baculovirus by trans-complementation were developed to obtain oral inoculum for insect larvae infection. First, the optimum regulatory region of polyhedrin promoter was determined utilizing chloramphenicol acetyl transferase (CAT) as the reporter gene. After infection with occ- baculovirus, the higher expression levels of CAT were achieved when a region of 2735bp that contained sequences known to have transcriptional enhancer functions were present upstream the polyhedrin coding sequence. This regulatory region was selected to drive polyhedrin expression in insect cell lines. Transfection of Sf9 cells with plasmid carrying polyhedrin gene and stable cell lines established by selection with blasticidin showed polyhedrin expression and, moreover, crystalline polyhedron-like structures were visualized by optic microscopy. Oral infectivity was demonstrated by fluorescence detection in Rachiplusia nu larvae infected with occluded AcGFPpolh- baculovirus obtained using the system presented here.

journal_name

J Biotechnol

journal_title

Journal of biotechnology

authors

López MG,Alfonso V,Carrillo E,Taboga O

doi

10.1016/j.jbiotec.2009.10.015

subject

Has Abstract

pub_date

2010-01-15 00:00:00

pages

199-205

issue

2

eissn

0168-1656

issn

1873-4863

pii

S0168-1656(09)00484-2

journal_volume

145

pub_type

杂志文章

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