 vector khác nhau   huyên ngành;    Abstract:       Keywords: ; ; Cecropin; Kháng kháng sinh; Sinh y Content Nhân ngày i 7/4/2011, t : không hà  m  sinh   p giúp nhân  sinh.   kháng s     Tro y  tách chi t côn trùng d nên  AMPs nói chung và cecropin nói riê                        côn trùng  Vi Na “Tách dòng và biểu hiện cecropin trong các hệ vector khác nhau”     CHƢƠNG 1 - TỔNG QUAN TÀI LIỆU     [63, 79]. Khi    la           nhân ni 7/4/2011 là nguy     cecropin quý giá (      .   n không    . v      .               .                ,     ,      ,          . ,               . cecropin    cecropin  cecropin E. coli  Tách dòng và biểu hiện cecropin trong các hệ vector khác nhau”. cecropin B     cecropin B cecropin   E. coli.   Tách dòng và biểu hiện cecropin tái tổ hợp trong các hệ vector khác nhau   nh giá ng       CHƢƠNG 2 - NGUYÊN LIỆU VÀ PHƢƠNG PHÁP NGHIÊN CỨU 2.1. Nguyên liệu 2.1.1. Các hệ vector - Các vecmang gen cecropin   + pJET1.2-cecH: vector pJET1.2 mang gen cecropin     r  Drosophila melanogaster + pJET1.2-cecN: vector pJET1.2 mang gen cecropin    nBombyx mori + pCR2.1-cecT: vector pCR2.1 mang gen cecropin B  - Vector nhân dòng: pBluescript II KS(+) (kí h -     -4T-    e, vector pET-28a và vector pET- 2.1.2. Các chủng vi khuẩn - E. coli DH5  - E. coli BL21 (DE3) và E. coli   2.1.3. Các cặp mồi   Bảng 5. T các  Tên mồi Trình tự mồi (5’-3’) Vai trò của cặp mồi Oligo 1 aattcatcgatggatgaatttctcaaggatatttttct tcgtgttcgctttggttctggctttgtcaacagtttcg cecropin Oligo 6 tcgaggctagcttatcctagcgctttggcttcgcct aaaaccgcgatcgctggtccagccttgac pJET1.2 F cgactcactatagggagagcggc     gen cecropin  pJET1.2-cecropin pJET1.2 R aagaacatcgattttccatggcag T7 aatacgactcactatag Nhân    gen cecropin pBS-cecropin, pCR2.1-cecropin M13/pUC reverse caggaaacagctatgac pGEX- Bam-cec actggatccatgaatttctcaaggatatttttcgtgtt cgctttggttctggct Nhân    cecropin  -4T-1 pGEX F gggctggcaagccacgtttggtg Nhân    gen cecropin trong vector tái   - cecropin pGEX R cctctgacacatgcagctcccgg pET28a- Eco-cec atagaattcatgtcccctatact Nhân    cecropin  -28a pET32b- Nco-cec attccatggcaatgaatttctcaaggatatttttcgtgtt Nhân    cecropin  o vector pET-32b pET 28 ggtgatgtcggcgatatagg    -28a-cecropin và pET-32b- cecropin pET 28 T7 gctagttattgctcagcgg 2.1.4. Gel sắc ký ái lực Glutathione Sepharose 4B, Ni-NTA agarose  tathione Sepharose 4B (GE He     lu       -transferase (GST). Glutathi      là agarose 4% thông qua     GST, các protein     -  2+    2.1.5. Các hóa chất và thiết bị  Hóa chất: -         Taq DNA polymerase (Fermentas), AmpliTaq Gold® DNA polymerase (Applied Biosystems) -     Fermentas, New England Biolabs), enzyme T4 DNA ligase (Fermentas, Invitrogen) - Protease: thrombin (GE Healthcare), enterokinase (New England Biolabs) - % trypton, 0.5% ca men, 0.5% NaCl - Kit  QIAquick PCR Purification Kit (QIAGEN) -                  phosphate pH 7.4 (3.1 g NaH 2 PO 4 .H 2 O, 10.9 g Na 2 HPO 4, thêm H 2 PBS (150 mM NaCl, 20 mM sodium phosphate), PBS lysis (150 mM NaCl, 20 mM sodium phosphate, 1 mM PMSF, 1% Triton-X100), GST elution (50 mM Tris-HCl pH 8, 20 mM glutathione reduced), His lysis (50 mM NaH 2 PO 4 , 300 mM NaCl, 10 mM imidazole, 1 mM PMSF, 1% Triton-X100), His wash (50 mM NaH 2 PO 4 , 300 mM NaCl, 20 mM imidazole), His elution (50 mM NaH 2 PO 4 , 300 mM NaCl, 250 mM imidazole), EK buffer (20 mM Tris-HCl pH 8, 50 mM NaCl, 2 mM CaCl 2 ) -        IPTG, X-gal, PMSF, Triton X-100, SDS, ure, isopropanol, ethanol, methanol, Coomassie Brilliant Blue, sodium bicarbonate, Tris base, HCl, acrylamide,     Thiết bị:      -Khoa -Phòng thí ng-Protein  2.2. Phương pháp 2.2.1. Sơ đồ nghiên cứu    9. Hình 9.   2.2.1.1. Tách dòng (subclone) các gen cecropin từ các vector nhân dòng sang vector biểu hiện Các gen cecH, cecN và cecT nhân dòng sang các vector  thông qua vector nhân dòng      10. Hình 10. . CHƢƠNG 3 - KẾT QUẢ   1. -4T-1 (pGEX-cecH, pGEX-cecN, pGEX-cecT-cecH, pET 28a- cecN, pET 28a-cecT-cecH, pET 32b-cecN, pET 32b- cecT). 2. Biu hin thành công: a. i dng dung hp vi GST trong c 2 chng t bào biu hin E. coli BL21 (DE3) và E. coli JM109. b. i dng dung hp vi 2 Tag His+GST trong chng t bào biu hin E. coli BL21 (DE3). c. i dng dung hp vi Trx trong chng t bào biu hin E. coli BL21 (DE3). 3. c trng thái biu hin ca các cecropin dung hp: a. GST-cecH, GST-cecN, GST-cecT; His+GST-cecH, His+GST-cecN  dng th vùi. b. Trx-cecH, Trx-cecN, Trx-cecT  dng tan. 4. Làm tan thành công các cecropin dung hp vi GST dng th vùi bng SDS 0.5% và ure 8 M. 5. Tinh sch thành công các cecropin dung hp vi Trx (Trx-cecH, Trx-cecN, Trx-cecT) và cecropin dung hp vi GST (GST-cecH, GST-cecN, GST-cecT) sau khi làm tan bng ure 8 M. Hiu sut tinh sch cecropin dung hp vi Tag Trx cao hn hn so vi Tag GST. 6. u x c cecropin dung hp bng protease thrombin (cecropin dung hp vi GST).        1. Chuu kin gii phóng cecropin khi GST và Trx bng là thrombin và enterokinase. 2. Loi b  thu các cecropin tinh sch. 3. Th hot tính kháng khun ca 3 loi cecropin: cecH, cecN và cecT trên các chng vi sinh vt kim nh. T  nh giá s khác bit v hot tính kháng khun ca 3 cecropin này  s khác bit v hot tính ca cùng 1 cecropin nhng theo hai cách làm tan bin tính và không bin tính. 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Antimicrobial Peptide Paralogs by the Activities of Recombinant Proteins and the Induced Expression Profiles”, PloS One, 6(3), pp e18109 69 Yu F., Wang J., Zhang P., Hong Y., Liu W (2010), “Fusion expression of cecropin B-like antibacterial peptide in Escherichia coli and preparation of its antiserum”, Biotechnology Letters, 32, pp 669-673 70 Zasloff M (2002), “Antimicrobial peptides of multicellular organisms”,... http://www.historylearningsite.co.uk/alexander_fleming_and_penicillin.htm 76 http://www.invitrogen.com/site/us/en/home/Products-and Services/Applications/ProteinExpression-and-Analysis/Protein-Expression-Systems-and-Vectors/Protein-ExpressionSystems.html 77 http://www.nhandan.com.vn/cmlink/nhandandientu/thoisu/khoa-hoc/khoa-h-c/bao-ng-tinh-trng-khang-thu-c-khang-sinh-1.292643#y2iCFxHSBTzz 78 http://www.promega.com/resources/product-guides-and-selectors/protocols-and-applicationsguide/protein-expression/ .   Tách dòng và biểu hiện cecropin trong các hệ vector khác nhau .  cecropin B      cecropin. Tách dòng (subclone) các gen cecropin từ các vector nhân dòng sang vector biểu hiện Các gen cecH, cecN và cecT nhân dòng