scholarly journals High-efficiency expression and characterization of the synaptic-vesicle monoamine transporter from baculovirus-infected insect cells

1998 ◽  
Vol 330 (2) ◽  
pp. 959-966 ◽  
Author(s):  
K. Michael SIEVERT ◽  
S. David THIRIOT ◽  
H. Robert EDWARDS ◽  
E. Arnold RUOHO
Keyword(s):  
Synaptic Vesicle ◽  
High Efficiency ◽  
Insect Cells ◽  
Expression System ◽  
Broad Band ◽  
Recombinant Baculovirus ◽  
Baculovirus Expression System ◽  
Sf9 Cells ◽  
Monoamine Transporter ◽  
Infected Cells

The full-length cDNA for the rat synaptic-vesicle monoamine transporter (VMAT2) containing a C-terminal polyhistidine epitope has been engineered into baculovirus DNA for expression in Spodoptera frugiperda (Sf9) insect cells. Using this recombinant baculovirus and cultured Sf9 cells, rVMAT2 has been expressed at levels of 7.8×106 transporters per cell, as assessed by [3H]dihydrotetrabenazine binding. A 1 l culture of infected cells produced approx. 15 nmol (900 μg) of transporter. rVMAT2 expressed in the Sf9 cells bound [3H]dihydrotetrabenazine with a KD of 31.2 nM and a Bmax of 19.9 pmol/mg. Two polypeptides of 55 and 63 kDa were identified using the photolabel, 7-azido-8-[125I]iodoketanserin ([125I]AZIK). Photoaffinity labelling of rVMAT2 by 1 nM [125I]AZIK was protectable by 10 μM tetrabenazine and 10 μM 7-aminoketanserin. Digitonin-solubilized VMAT2 was purified to greater than 95% homogeneity using immobilized Ni2+-affinity chromatography, followed by lectin (Concanavalin A) chromatography. The purified transporter migrates as a single broad band with a molecular mass of approx. 63 kDa, as analyzed by SDS/PAGE. The purified transporter retained the ability to bind ligands ([125I]AZIK and [3H]dihydrotetrabenazine). The purified VMAT2 bound [3H]dihydrotetrabenazine with a KD of 86.2 nM. As is the case with the monoamine transporter from bovine chromaffin granule membranes, purified VMAT2 is covalently modified by dicyclohexylcarbodi-imide (DCCD) and is specifically labelled by [14C]DCCD. This labelling is inhibited by tetrabenazine and ketanserin. These data indicate that VMAT2 can be overexpressed using the baculovirus expression system and purified.

scholarly journals Biosynthesis of recombinant human pro-α1(III) chains in a baculovirus expression system: production of disulphide-bonded and non-disulphide-bonded species containing full-length triple helices

1995 ◽  
Vol 312 (3) ◽  
pp. 847-853 ◽  
Author(s):  
M Tomita ◽  
N Ohkura ◽  
M Ito ◽  
T Kato ◽  
P M Royce ◽  
...  
Keyword(s):  
Insect Cells ◽  
Incubation Temperature ◽  
Expression System ◽  
Significant Proportion ◽  
Recombinant Baculovirus ◽  
Baculovirus Expression System ◽  
Dermal Fibroblasts ◽  
Full Length ◽  
Type Iii Collagen ◽  
Procollagen Iii

We have investigated the expression of human procollagen III by insect cells infected with a recombinant baculovirus carrying cDNA for the pro-alpha1(III) chain of type-III collagen. A high level of expression was obtained, and a small proportion of the heterologously expressed pro-alpha1(III) chains formed normally disulphide-bonded procollagen III, which was secreted into the culture medium. This species displayed a melting temperature (Tm) of approx. 38 degrees C as assessed by its resistance to digestion by a mixture of trypsin and chymotrypsin, slightly lower than that of 39.5 degrees C for procollagen III synthesized by cultured human dermal fibroblasts, and reflected a slight degree of under-hydroxylation of prolyl residues. This is possibly a consequence of the lower incubation temperature of insect cells, or of an insufficiency of prolyl hydroxylase activity within them. A significant proportion of the expressed chains formed trimeric molecules of similar thermal stability containing an apparently full-length triple-helical region, but were not disulphide-bonded and not secreted. In addition to providing a source of recombinant human procollagen III, the system promises to be useful in the study of procollagen chain association and subsequent folding.

Expression of H5N1Avian influenza virushaemagglutinin in a baculovirus expression system

2007 ◽  
Vol 4 (3) ◽  
pp. 233-237 ◽  
Author(s):  
Dun Jifeng ◽  
Pu Juan ◽  
Zhou Yingchun ◽  
Liu Jinhua
Keyword(s):  
Shuttle Vector ◽  
Expression System ◽  
Recombinant Baculovirus ◽  
Baculovirus Expression System ◽  
Sf9 Cells ◽  
Ha Gene ◽  
Sds Page ◽  
Reaction Specificity ◽  
H5 Subtype ◽  
Ha Protein

AbstractThe haemagglutinin (HA) gene of H5N1Avian influenza virus(AIV) was amplified from the plasmid pGEM-HA and cloned into the baculovirus transfer plasmid pFastBacHT to construct the recombinant transfer vector pFastBacHT-HA. The pFastBacHT-HA was transformed into DH10Bac competent cells, transposed with a shuttle vector (Bacmid) and the transposition rBacmid-HA was constructed. The recombinant baculovirus was harvested from sf9 cells transfected with rBacmid-HA. The expressed HA protein was identified and analysed by SDS–PAGE, Western blot and haemadsorption assay. The 66 kDa protein could only react with chicken serum positive to H5 subtype AIV. The haemadsorption assay showed that the sf9 cells infected with rBacmid-HA baculovirus could absorb chicken red blood cells. These results indicated that the HA protein was successfully expressed in sf9 cells, with reaction specificity to H5 subtype antiserum.

scholarly journals NTP binding and phosphohydrolase activity associated with purified bluetongue virus non-structural protein NS2

2000 ◽  
Vol 81 (8) ◽  
pp. 1961-1965 ◽  
Author(s):  
Nigel J. Horscroft ◽  
Polly Roy
Keyword(s):  
Bluetongue Virus ◽  
Inclusion Bodies ◽  
Insect Cells ◽  
Expression System ◽  
Baculovirus Expression System ◽  
Structural Protein ◽  
Baculovirus Expression ◽  
Infected Cells ◽  
Viral Inclusion ◽  
Hydrolysis Of

The bluetongue virus ssRNA-binding protein, NS2, is a phosphoprotein that forms viral inclusion bodies in infected cells. Recombinant NS2 was expressed in the baculovirus expression system and purified to homogeneity from insect cells. Purified NS2 bound nucleosides. Further investigation revealed that the protein bound ATP and GTP and could hydrolyse both nucleosides to their corresponding NMPs, with a higher efficiency for the hydrolysis of ATP. The increased efficiency of hydrolysis of ATP correlated with a higher binding affinity of NS2 for ATP than GTP. Ca2+, Mg2+ and Mn2+ were able to function as the required divalent cation in the reactions. The phosphohydrolase activity was not sensitive to ouabain, an inhibitor of cellular ATPases, suggesting that this activity was not the result of a cellular contaminant.

scholarly journals Functional human transcobalamin II isoproteins are secreted by insect cells using the baculovirus expression system

Blood ◽  
1993 ◽  
Vol 81 (5) ◽  
pp. 1239-1245 ◽  
Author(s):  
EV Quadros ◽  
P Sai ◽  
SP Rothenberg
Keyword(s):  
Amino Acid ◽  
Amino Acid Sequence ◽  
Insect Cells ◽  
Expression System ◽  
K562 Cells ◽  
Baculovirus Expression System ◽  
Leader Peptide ◽  
Sf9 Cells ◽  
Specific Expression ◽  
Transcobalamin Ii

Abstract Transcobalamin II (TCII) is a cobalamin (Cbl, vitamin B12)-binding protein in mammalian plasma that facilitates the cellular uptake of the vitamin. To obtain human TCII in sufficient quantity for analytical studies, the complementary DNA (cDNA) encoding TCII was inserted into the plasmid PVL 1393, and the baculovirus expressing TCII was obtained by homologous recombination in Spodoptera frugiperda (SF9) insect cells by cotransfection with the wildtype virus. Under optimized conditions, SF9 cells infected with the recombinant virus secreted 2 to 4 micrograms of TCII per milliliter of culture medium. TCII did not accumulate in the SF9 cells and seemed to be constitutively secreted as observed previously in cultured human endothelial cells. The purified recombinant TCII has the same molecular weight by SDS-PAGE as purified human TCII. The recombinant TCII cross-reacts with an antiserum to native human TCII, binds Cbl and facilitates the uptake of Cbl in eukaryotic cells by binding to the receptor for TCII-Cbl on the plasma membrane of K562 cells. Amino acid sequence analysis of the purified recombinant TCII identified two polypeptides, one identical to the amino acid sequence deduced from the cDNA and a second lacking the first and second N-terminal residues. These sequences are identical to two TCII polypeptides purified from Cohn fraction III of pooled human plasma. The two forms of recombinant TCII have the same isoelectric points as the two predominant isoprotein forms of TCII in human serum. Since the baculovirus construct contains a single cDNA that can encode only one amino acid sequence, the two isoproteins in recombinant TCII must be generated by a mechanism other than allele specific expression. A plausible mechanism for generating isoproteins of nonglycosylated peptides, such as TCII, may be by splicing of the leader peptide at alternative sites.

scholarly journals Expression, Purification and Sublocalization of SARS-CoV Nucleocapsid Protein in Insect Cells

2004 ◽  
Vol 36 (11) ◽  
pp. 754-758 ◽  
Author(s):  
Ai-Xia Ren ◽  
You-Hua Xie ◽  
Yu-Ying Kong ◽  
Guan-Zhen Yang ◽  
Yao-Zhou Zhang ◽  
...  
Keyword(s):  
Nucleocapsid Protein ◽  
Trichoplusia Ni ◽  
Insect Cells ◽  
Expression System ◽  
Recombinant Baculovirus ◽  
Baculovirus Expression System ◽  
Functional Study ◽  
Expression And Purification ◽  
N Protein ◽  
Baculovirus Expression

Abstract The causative agent of severe acute respiratory syndrome (SARS) is a previously unidentified coronavirus, SARS-CoV. The nucleocapsid (N) protein of SARS-CoV is a major viral protein recognized by acute and early convalescent sera from SARS patients. To facilitate the studies on the function and structure of the N protein, this report describe the expression and purification of recombinant SARS-CoV N protein using the baculovirus expression system. Recombinant hexa-histidine-tagged N protein with a molecular mass of 47 kD was produced in insect cells. Recombinant N protein was purified to near homogeneity by Ni2+-NTA affinity chromatography. In addition, we examined the subcellular localization of the N protein by confocal microscopy in Trichoplusia ni BT1 Tn 5B1–4 cells infected with recombinant baculovirus. The N protein was found localized in the cytoplasm as well as in the nucleolus. The purified recombinant N protein can be used in further functional study of SARS-CoV.

High-level expression of recombinant porcine LH receptor in baculovirus-infected insect cells or caterpillars

1995 ◽  
Vol 14 (1) ◽  
pp. 51-66 ◽  
Author(s):  
E Pajot-Augy ◽  
L Couture ◽  
V Bozon ◽  
J-J Remy ◽  
G Biache ◽  
...  
Keyword(s):  
Total Protein ◽  
Large Scale ◽  
Insect Cells ◽  
Expression System ◽  
Recombinant Baculovirus ◽  
Multiplicity Of Infection ◽  
Scale Production ◽  
Lh Receptor ◽  
Recombinant Receptor ◽  
Infected Cells

ABSTRACT Porcine LH receptor ectodomain was overexpressed in insect cells and lepidopteran larvae using the recombinant baculovirus expression system. A low multiplicity of infection yielded the largest active production, of approximately 107 receptors/cell or 3 μg active receptor/mg total protein in infected cells. The truncated ectodomain solubilized with Triton X-100 bound its ligand with a high affinity which was comparable with that of the native membrane receptor. Increasing the multiplicity of infection resulted in an optimum protein production of 0·6 mg receptor/mg total protein in infected cells. This receptor was largely inactive, probably trapped within aggregation pools. Active receptor could be recovered by dilution of the samples. No secretion of recombinant receptor was ever observed whatever the conditions of infection. Expression of the recombinant receptor in insect larvae was also tested. This low-cost system failed both to increase the amount of active receptor and to induce secretion into the haemolymph. Two methods remain for producing sizeable amounts of active receptor with this baculovirus/insect cell system. One relies on immunoaffinity purification of the active protein and requires large-scale production, and the other is based on the purification of overexpressed inactive receptor followed by renaturation.

scholarly journals Functional human transcobalamin II isoproteins are secreted by insect cells using the baculovirus expression system

Blood ◽  
1993 ◽  
Vol 81 (5) ◽  
pp. 1239-1245 ◽  
Author(s):  
EV Quadros ◽  
P Sai ◽  
SP Rothenberg
Keyword(s):  
Amino Acid ◽  
Amino Acid Sequence ◽  
Insect Cells ◽  
Expression System ◽  
K562 Cells ◽  
Baculovirus Expression System ◽  
Leader Peptide ◽  
Sf9 Cells ◽  
Specific Expression ◽  
Transcobalamin Ii

Transcobalamin II (TCII) is a cobalamin (Cbl, vitamin B12)-binding protein in mammalian plasma that facilitates the cellular uptake of the vitamin. To obtain human TCII in sufficient quantity for analytical studies, the complementary DNA (cDNA) encoding TCII was inserted into the plasmid PVL 1393, and the baculovirus expressing TCII was obtained by homologous recombination in Spodoptera frugiperda (SF9) insect cells by cotransfection with the wildtype virus. Under optimized conditions, SF9 cells infected with the recombinant virus secreted 2 to 4 micrograms of TCII per milliliter of culture medium. TCII did not accumulate in the SF9 cells and seemed to be constitutively secreted as observed previously in cultured human endothelial cells. The purified recombinant TCII has the same molecular weight by SDS-PAGE as purified human TCII. The recombinant TCII cross-reacts with an antiserum to native human TCII, binds Cbl and facilitates the uptake of Cbl in eukaryotic cells by binding to the receptor for TCII-Cbl on the plasma membrane of K562 cells. Amino acid sequence analysis of the purified recombinant TCII identified two polypeptides, one identical to the amino acid sequence deduced from the cDNA and a second lacking the first and second N-terminal residues. These sequences are identical to two TCII polypeptides purified from Cohn fraction III of pooled human plasma. The two forms of recombinant TCII have the same isoelectric points as the two predominant isoprotein forms of TCII in human serum. Since the baculovirus construct contains a single cDNA that can encode only one amino acid sequence, the two isoproteins in recombinant TCII must be generated by a mechanism other than allele specific expression. A plausible mechanism for generating isoproteins of nonglycosylated peptides, such as TCII, may be by splicing of the leader peptide at alternative sites.

Biochemical Chgaracterization of Recombinant Baculovirus 373 K/E p53 Protein

2018 ◽  
Vol 9 (03) ◽  
pp. 20204-20223
Author(s):  
Maghsoudi, Hossein ◽  
U Pati
Keyword(s):  
Dna Binding ◽  
P53 Protein ◽  
Expression System ◽  
Gel Filtration ◽  
Recombinant Baculovirus ◽  
Baculovirus Expression System ◽  
Cross Linking ◽  
Mobility Shift ◽  
Dna Complexes ◽  
P53 Antibodies

In this study, we expressed and purified the recombinant baculovirus 373 K/E p53 protein in a baculovirus expression system to characterize this mutant and compare it with wild type p53. Gel- filtration chromatography and chemical cross-linking experiments indicated that purified recombinant baculovirus 373 K/E p53 protein assembles into multimeric forms ranging from tetramers to polymers. Gel-mobility shift assays and protein-DNA cross-linking studies demonstrated that the recombinant protein binds, to a consensus DNA target as a dimer but that additional p53 mutant molecules may then associate with the preformed p53-dimer-DNA complexes to form a larger p53_DNA complexes. These observations suggest that the p53 mutant tetramers and polymers that forms the minimal p53 mutant complex in solution dissociated upon DNA binding to form p53 mutant dimmer DNA complexes. The DNA binding activity of this mutant was then investigated using electrophoretic mobility shift assays as well as supershift assay with anti-p53 antibodies. Binding of the anti-p53 antibody PAb421to the oligomerization promoting domain on p53 stimulated the sequential formation of both the p53_dimer DNA and larger p53-DNA complexes

scholarly journals Production, processing and partial purification of functional G protein βγ subunits in baculovirus-infected insect cells

1992 ◽  
Vol 286 (3) ◽  
pp. 677-680 ◽  
Author(s):  
J D Robishaw ◽  
V K Kalman ◽  
K L Proulx
Keyword(s):  
G Protein ◽  
G Proteins ◽  
Insect Cells ◽  
Expression System ◽  
Baculovirus Expression System ◽  
Partial Purification ◽  
Baculovirus Expression ◽  
Gamma Subunits ◽  
Infected Insect ◽  
Beta 2

As a result of the inability to resolve the heterogeneous mixture of G protein beta gamma subunits present in tissues, it has not been possible to compare different beta gamma subunits of the G proteins in terms of their proposed roles in receptor-effector coupling. This study was undertaken to establish the utility of the baculovirus expression system in producing homogeneous beta gamma subunits of defined composition for the comparative analysis of these subunits in reconstitution systems. In this study we report the expression, and appropriate post-translational processing, of recombinant beta 2, gamma 2 and gamma 3 subunits. In addition, we show that the recombinant beta gamma subunits can be readily purified, and can functionally interact with the alpha subunits of the G proteins.

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