Sains
Malaysiana 41(4)(2012): 423-430
Sistem Minigenom Virus Penyakit
Newcastle (NDV) AF2240 Sebagai Sistem
Pengekspresan Gen Sel Mamalia
(Minigenome
System for Newcastle Disease Virus (NDV) AF2240
as
a Gene Expression System for Mammalian Cells)
Shahrul
Hisham Zainal Ariffin*, Roslina Shamsudin, Nurul Atikah
Ahmad
& Zulkiflie Zamrod
Pusat
Pengajian Biosains dan Bioteknologi, Fakulti Sains dan Teknologi
Universiti
Kebangsaan Malaysia, 43600 UKM Bangi, Selangor D.E., Malaysia
Diserahkan:
7 Jun 2011 / Diterima: 19 September 2011
ABSTRAK
Sistem
minigenom telah digunakan untuk mengkaji replikasi dan transkripsi virus RNA
tidak bersegmen. Objektif kajian ini adalah untuk membina sistem minigenom bagi
virus NDV strain tempatan, AF2240 serta bagi mengkaji mekanisme transkripsi dan
replikasi virus ini. Bagi tujuan ini lima plasmid digunakan iaitu pMGNDV,
pCITENP, pCITEP, pTriEX-T7, dan pGEML. Kesemua plasmid diekstrak secara
berskala besar dan dimendakkan menggunakan polietilina glikol. Hasil
ekstrak
ini digunakan untuk transfeksi ke dalam sel. Translasi in vitro dilakukan dengan
menggunakan pCITENP, pCITEP dan pTriEX-T7 untuk memastikan kesemua konstruk ini
berfungsi. Hasil pemblotan western menunjukkan protein bersaiz~100 kDa (T7),
~53 kDa (NP), ~53 dan 55 kDa (P) berjaya diekspreskan. Protein CAT diperoleh
apabila plasmid yang mengekodkan minigenom NDV ditransfeksi bersama plasmid
yang mengekodkan protein nukleokapsid (NP), fosfoprotein (P)
dan
subunit besar polimerase (L) ke dalam sel BHK-21. Dianggarkan 55 pg protein CAT
berjaya diperoleh menggunakan kit CAT ELISA. Hasil pemblotan western turut
menunjukkan protein CAT bersaiz 25 kDa dihasilkan. Kesimpulannnya, system minigenom
ini berupaya untuk berfungsi dan mampu mengekspreskan gen asing di dalam sel
mamalia BHK-21.
Kata
kunci: Pengekspresan gen; sistem minigenom; sistem pengekspresan sel mamalia;
transfeksi; virus penyakit Newcastle
ABSTRACT
The
minigenome system has been used as a model for studying transcription and
replication for nonsegmented RNA viruses. The objective of this study was to
develop a minigenome system for NDV local strain AF2240 and also to study the
mechanism of replication and transcription of this virus. For this purpose,
five recombinant plasmids; pMGNDV, pCITENP, pCITEP, pTriEX-T7 and pGEML were
used. Transfection of all plasmids was carried out following large scale extraction
and polyethylene glycol precipitation of plasmids. In vitro translational was
performed by using pCITENP, pCITEP, and pTriEX-T7 to ensure the constructs are
functional. Western blot analysis showed that protein with approximate molecular
weights of 100 kDa (T7), 53 kDa (NP), 53 and 55 kDa (P) was successfully
detected. CAT protein was detected when plasmid encoding the NDV minigenome was
cotransfected into BHK-21 cells with plasmid encoding nucleocapsid (NP), phosphoprotein
(P) and large polymerase subunit (L) protein. Approximately, 55 pg CAT protein
was successfully quantified by CAT ELISA. Western blot analysis also showed
that the CAT protein with the size of 25 kDa was successfully obtained. In
conclusion, this study showed that the system was functional and able to
express foreign gene in mammalian cells BHK-21.
Keywords:
Gene expression; mammalian cell expression system; minigenome system; Newcastle
disease virus; Transfection
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*Pengarang
untuk surat-menyurat; email: hisham@cgat.ukm.my
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