Hasil Pencarian  ::  Simpan CSV :: Kembali

"Latar belakang: Beta defensin diekspresikan terutama oleh sel epitel pada permukaan mukosa berbagai organ seperti kulit, usus, mulut dan saluran genital. Studi sebelumnya menunjukkan bahwa beta defensin 30 (Defb30) terekspresi spesifik di epididimis. Defb30 merupakan peptida kationik berukuran kecil yang diduga berperan penting pada proses pematangan spermatozoa di epididimis dan juga berperan sebagai pertahanan host terhadap infeksi mikroba. Untuk mempelajari aktivitas antimikroba Defb30 ini diperlukan analisis pada tingkat protein dan hal tersebut memerlukan protein dalam jumlah yang cukup. Karena itu perlu dilakukan suatu rekayasa genetika untuk pembuatan protein rekombinan DEFB30.Metode: Gen sintetik penyandi protein DEFB30 yang telah dioptimasi kodonnya diklona ke dalam vektor pQE-80L, suatu plasmid yang mengandung sistem ekspresi untuk prokariota. Plasmid rekombinan yang mengandung sisipan gen target dikonfirmasi dengan analisis enzim restriksi dan sekuensing. Selanjutnya plasmid rekombinan di ekpresikan ke dalam E. coli BL21 dan diinduksi menggunakan IPTG (Isopropyl-1-Thio-d-Galactopyranoside) dengan berbagai waktu inkubasi. Deteksi protein rekombinan dilakukan dengan SDS-PAGE dan westernblotting. IMAC (Immobilized Metal Affinity Chromatography) digunakan untuk mempurifikasi protein rekombinan. Uji antimikroba protein rekombinan dilakukan dengan cara pengukuran nilai optical density (OD) dan dianalisis hasilnya menggunakan uji one way anova.Hasil: Gen sintetik penyandi protein rekombinan DEFB30 berhasil dikonstruksi pada plasmid pQE-80L. Ekspresi ke dalam E. coli BL21 menghasilkan suatu protein fusi setelah diinduksi menggunakan IPTG selama 4 jam. Hasil analisis protein rekombinan dengan westernblotting menggunakan antibodi Anti-His G-HRP menunjukkan terbentuk pita tebal yang berukuran diatas 10 kDa (±12 kDa). Uji antimikroba protein rekombinan DEFB30 menunjukkan bahwa DEFB30 dapat menghambat pertumbuhan bakteri Eschericia coli dan Bacillus subtilis.Kesimpulan: Gen sintetik penyandi beta defensin 30 berhasil diklona ke dalam plasmid pQE-80L. Ekspresikan protein rekombinan DEFB30 menghasilkan suatu protein fusi berukuran ±12kDa. Protein rekombinan DEFB30 terbukti memiliki sifat antimikroba terhadap Eschericia coli dan Bacillus subtilis.

---

ackground: Beta defensins are primarily expressed by epithelial cells at mucosal surfaces, such as those in skin, gut, mouth and genital tracts. Previous studies have demonstrated that beta defensin 30 (Defb30) is exclusively expressed in the epididymis. Defb30 is known as a small cationic antimicrobial peptide which plays an important role in epididymal sperm maturation and also acts as a host defence against microbial infection. Study of Defb30 role in the antimicrobial activity requires generating DEFB30 protein for characterization. For the purpose of this study, genetic engineering was done for the manufacture of the DEFB30 recombinant protein.

Methods: In this study, according to the preferred codon in E. coli, the Defb30 gene was optimized and synthesized. The gene was cloned into pQE-80L vector and subsequently expressed in E. coli BL21; using IPTG (Isopropyl-1-Thio-d-Galactopyranoside) as an inducer. Detection of recombinant protein was carried out by using SDS-PAGE and westernblotting. IMAC (Immobilized Metal Affinity Chromatography) was used to purify recombinant protein. Optical density measurement was used to analyze antimicrobial property of the DEFB30 recombinant protein.

Results: The synthetic gene was successfully constructed into pQE-80L plasmid and expression of the recombinant protein in E. coli BL21 produced a fusion protein after being induced by IPTG for 4 hours. Westernblotting analysis using Anti-His G-HRP antibody showed band above 10kDa (±12kDa). Antimicrobial assay for DEFB30 recombinant protein showed inhibition towards growth rates of Eschericia coli and Bacillus subtilis.

Conclusion: Defb30 synthetic gene was succesfully cloned into pQE-80L plasmid. Expression of recombinant DEFB30 produced a fusion protein of ±12kDa. This recombinant protein has antimicrobial property towards Eschericia coli and Bacillus subtilis."

"Peningkatan ekspresi gen Sox2 dan c-Myc telah dilaporkan memiliki korelasi dengan tingkat keparahan kanker payudara. Sox2 dan c-Myc merupakan faktor transkripsi utama yang berperan dalam proses diferensiasi sel punca kanker. Penelitian ini bertujuan mengkonstruksi gen penyandi pluripotensi Sox2 dan c-Myc ke dalam sel inang Escherichia coli DH5α dengan menggunakan plasmid pET101/D-TOPO. Prinsip kloning yang dilakukan adalah dengan mengklon DNA binding domain dari gen Sox2 dan c-Myc. Untuk mendapatkan DNA Sox2 dan c-Myc, dilakukan reverse-transcriptase polymaerase chain reaction (RT-PCR) dengan menggunakan template mRNA dari sel punca kanker payudara serta aplifikasi dengan PCR untuk mendapatkan fragmen DNA dalam jumlah banyak. Forward primer dan reverse primer yang digunakan dirancang dengan menggunakan data dari NCBI GenBank dan UNIPROT serta program Serial Cloner dan PerlPrimer. Sebelum dikloning, dilakukan sekuensing. Hasil sekuensing dianalisis dengan menggunakan BLAST. Fragmen DNA diligasi berdasarkan prinsip penambahan empat basa pada forward primer (CACC) yang overhang terhadap ujung 5' vektor kloning (GTGG). Hasil ligasi ditransformasi menggunakan metode secara kimia dengan CaCl2 dan heat shock. Koloni yang tumbuh direplika dan dilakukan isolasi plasmid. Hasil PCR plasmid rekombinan menunjukkan bahwa gen Sox2 dan c-Myc berhasil disisipkan ke dalam vektor.

---

Increase in Sox2 and c-Myc gene expression have been reported to correlate with the severity of breast cancer. Sox2 and c-Myc is the major transcription factor in the process of stem cell differentiation. The objective of this study is to construct the gene coding of pluripotency, Sox2 and c-Myc, into Escherichia coli DH5α host cell by using the pET101/D-TOPO vector. The cloning principle is to clone the binding site domain of Sox2 and c-Myc. In order to get the Sox2 and c-Myc DNA, reverse-transcriptase polymerase chain reaction (RT-PCR) was carried out using mRNA template from breast cancer stem cell and amplification using PCR to obtain DNA fragment in large quantities. Forward primer used were designed using the data from NCBI GenBank and UNIPROT with Serial Cloner and PerlPimer program. Sequencing was carried out before the cloning process. The sequencing result were analyzed using BLAST. DNA frgament was ligated using principle of four base addition to the forward primer (CACC) which overhang in the 5' and of cloning vector (GTGG). The ligation product was transformed using the chemical method with CaCl2 and heat shock. The colonies were replicated and the plasmid was isolated. The result showed that Sox2 and c-Myc was successfully inserted into the vector."

"Principles of Cloning, Second Edition is the fully revised edition of the authoritative book on the science of cloning. The book presents the basic biological mechanisms of how cloning works and progresses to discuss current and potential applications in basic biology, agriculture, biotechnology, and medicine. Beginning with the history and theory behind cloning, the book goes on to examine methods of micromanipulation, nuclear transfer, genetic modification, and pregnancy and neonatal care of cloned animals. The cloning of various species-including mice, sheep, cattle, and non-mammals-is considered as well. The Editors have been involved in a number of breakthroughs using cloning technique, including the first demonstration that cloning works in differentiated cells done by the Recipient of the 2012 Nobel Prize for Physiology or Medicine - Dr John Gurdon; the cloning of the first mammal from a somatic cell - Drs Keith Campbell and Ian Wilmut; the demonstration that cloning can reset the biological clock - Drs Michael West and Robert Lanza; the demonstration that a terminally differentiated cell can give rise to a whole new individual - Dr Rudolf Jaenisch and the cloning of the first transgenic bovine from a differentiated cell - Dr Jose Cibelli. The majority of the contributing authors are the principal investigators on each of the animal species cloned to date and are expertly qualified to present the state-of-the-art information in their respective areas. First and most comprehensive book on animal cloning, 100% revisedDescribes an in-depth analysis of current limitations of the technology and research areas to exploreOffers cloning applications on basic biology, agriculture, biotechnology, and medicine."