Screening for antibiotics biosynthetic genes
Antibiotic biosynthesis potential of the 80 strains was
estimated by PCR screening. Five related genes encoding key
enzymes were tested, including Type I and type II (aromatic)
polyketide synthetases (PKS-I & PKS-II), nonribosomal
peptide synthetase (NRPS), 3-amino-5-hydroxybenzoic acid
synthase (AHBA), and glycopeptides associated gene oxyB.
Five sets of PCR primers were used: K1F (5′-TSA AGT CSA
ACA TCG GBC A-3′) and M6R (5′-CGC AGG TTS CSG
TAC CAG TA-3′) targeting PKS-I sequences [16]; A3F
(5′-GCS TAC SYS ATS TAC ACS TCS GG-3′) and A7R
(5′-SAS GTC VCC SGT SCG GTA S-3′) targeting NRPS
sequences [16]; ARO-PKS-F (5′-GGC AGC GGI TTC GGC
GGI TTC CAG-3′) and ARO-PKS-R (5′-CGI TGT TIA CIG
CGT AGA ACC AGG CG-3′) targeting PKS-II sequences [32];
ANSA-F (5′-CCS GCS TTC ACS TTC ATC TC-3′) and
ANSA-R (5′-AIS YGG AIC ATI GCC ATG TAG-3′)
targeting 3, 5-AHBA synthase gene rifK sequences [32]; rifK
gene of Amycolatopsis mediterranei was used as positive
control; Foxy (5′-CTG GTC GGC AAC CTG ATG GAC-3′)
and Roxy (5′-CAG GTA CCG GAT CAG CTC GTC-3′)
targeting P450 mono-oxygenase gene oxyB associated with
glycopeptides antibiotics [32]. The amplify system was similar
to the amplify system of 16S rRNA except for an addition of
2.5 μL DMSO per tube [33]. PCR reaction procedure was
performed as follows: (1) 5 min pre-denaturation at 96 oC; (2)
35 cycles of 45-s denaturation at 96 oC, 30-s annealing at 55
oC (for PKS-I), 59 oC (for NRPS), 64 oC (for PKS-II), 56 oC
(for ANSA) and 64 oC (for oxyB), and 45-s extension at 72 oC;
and (3) 10 min final extension step at 72 oC. Aliquots of the
PCR products (5 μL) were visualized by 1% agarose gel
electrophoresis stained with ethidium bromide.
Screening for antibiotics biosynthetic genesAntibiotic biosynthesis potential of the 80 strains wasestimated by PCR screening. Five related genes encoding keyenzymes were tested, including Type I and type II (aromatic)polyketide synthetases (PKS-I & PKS-II), nonribosomalpeptide synthetase (NRPS), 3-amino-5-hydroxybenzoic acidsynthase (AHBA), and glycopeptides associated gene oxyB.Five sets of PCR primers were used: K1F (5′-TSA AGT CSAACA TCG GBC A-3′) and M6R (5′-CGC AGG TTS CSGTAC CAG TA-3′) targeting PKS-I sequences [16]; A3F(5′-GCS TAC SYS ATS TAC ACS TCS GG-3′) and A7R(5′-SAS GTC VCC SGT SCG GTA S-3′) targeting NRPSsequences [16]; ARO-PKS-F (5′-GGC AGC GGI TTC GGCGGI TTC CAG-3′) and ARO-PKS-R (5′-CGI TGT TIA CIGCGT AGA ACC AGG CG-3′) targeting PKS-II sequences [32];ANSA-F (5′-CCS GCS TTC ACS TTC ATC TC-3′) andANSA-R (5′-AIS YGG AIC ATI GCC ATG TAG-3′)targeting 3, 5-AHBA synthase gene rifK sequences [32]; rifKgene of Amycolatopsis mediterranei was used as positivecontrol; Foxy (5′-CTG GTC GGC AAC CTG ATG GAC-3′)and Roxy (5′-CAG GTA CCG GAT CAG CTC GTC-3′)targeting P450 mono-oxygenase gene oxyB associated withglycopeptides antibiotics [32]. The amplify system was similarto the amplify system of 16S rRNA except for an addition of2.5 μL DMSO per tube [33]. PCR reaction procedure wasperformed as follows: (1) 5 min pre-denaturation at 96 oC; (2)รอบ 35 ของ 45 s แปรสภาพที่ 96 oC, 30 s หลอมที่ 55oC (สำหรับ PKS-ฉัน), 59 oC (สำหรับ NRPS) 56 oC, 64 องศา (สำหรับ PKS-II)(สำหรับ ANSA) และ 64 องศา (สำหรับ oxyB), และส่วนขยาย 45 s ที่ 72 oCและ (3) ขั้นตอนสุดท้ายขยาย 10 นาทีที่ 72 องศาเซลเซียส Aliquots ของการผลิตภัณฑ์ PCR (5 μL) มาแสดงเป็นภาพ โดยเจ 1% agaroseอิเลอะโบรไมด์ ethidium
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