Project's information

Project's title Study on production of recombinant H7N9 antigen in the tobacco plant Nicotiana sp. using agroinfiltration method, serving the purpose of creating a new generation of vaccines.
Project leader’s name Dr. Pham Bich Ngoc
Project duration 01/01/2014 - 01/01/2015
Project’s budget 600 million VND
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Goal and objectives of the project

Study on scientific and experimental fundamental of production of avian influenza H7N9 antigen in plant using transient exression technique, which serves in diagnosis and immunication.

Main results

- Theoretical results:
+ Designing 3 expression vector constructions containing artifical H7 gene from H7 gene of H7N9 virus: pCB301/HA/ELP, pCB301/HApII/ELP, pCB301/HApII and generate Agrobacterium strains carrying the respective vectors.
+ Designing two help vector constructions containing pIBT/2bCMV, pIBT/Hc-Pro PRSV and generate Agrobacterium strains carrying the respective vectors.
+Expressing successfully HA/ELP, HApII/ELP and HApII protein using Agroinfiltration. Help vectors act well, improving transient expression of recombinant protein, especially Hc-Pro PRSV.
+Designing successfully transient expression procedure using pIBT/Hc-Pro PRSV: AS concentration is 400µM, OD600 is 0.5, leave’s position is middle, time after infiltration is 8 days
+ Purifying successfully HA-ELP and HApII-ELP using mITC complementing PEG 8000 with recovery rate of HA-ELP and HApII-ELP are 77.8 % and 78.5 %, respectively, purity of the HA protein / ELP is 91% and that of HApII / ELP is 95.4%. Purifying successfully HApII using IMAC with recovery rate as 64,6%, purity as 78%.
+ Successfully characterization of trimeric structure of HApII by Cross-linking reaction.
+ Successfully characterization of stucture of HA_pII:ND by measurement of size, Zeta potential and TEM. The size of ND increased 80nm after mixing with HApII protein. Zeta poteintial of NDs and HApII-ND is -45mV and -38 mV, respectively.
+ HA titer of HA/ELP, HApII-ELP and HApII is 0 HAU, 2 HAU, 2 HAU , respectively. Whereas HA titer of HApII:ND (1:12) is 1024 HAU (per 5µg of protein at the first well).
+ HApII/ELP, HApII and HApII:ND both elicited immune responses in mice, the best immune activity belongs to HApII:ND. At the 3rd immune response, the ability of protein eliciting immune responses is higher than the 2nd one.
- Applied results: HApII/ELP, HApII and HApII:ND elicit strong immune response in mice, which is potiental in development of vaccine against H7N9 virus.

Some images of the project

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Novelty and actuality and scientific meaningfulness of the results

This is the first research on expression and purification of HA/H7N9 in plant using Agroinfiltration. Besides, application of nanotechnology improves immunogenicity of antigen. The project opens new direction in production of efficient, low price vaccine.

Images of project
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