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3 protocols using amersham hybond xl

1

m6A RNA Enrichment and Detection

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PolyA+ RNA selection was performed twice using Dynabeads mRNA DIRECT Purification Kit (Invitrogen, Cat. #61011) as described in the user manual. 2x polyA+ RNA samples were spotted onto the membrane, Amersham Hybond-XL (Cytiva, Cat# RPN303s). The membrane was completely dried and crosslinked in a UV STRATALINKER 1800 using the automatic function. The membrane was then blocked for 10 min using sterile RNase, DNase-free TBST + 5% skim milk. The m6A primary antibody was then added at a concentration of 1:1,000 in TBST + 5% skim milk at 4°C, overnight. The membrane was washed four times in TBST and then incubated with the secondary anti-rabbit antibody (1:5,000) for 1 h in TBST + 5% skim milk. The membrane was washed four times in TBST and exposed on the ChemiDoc imaging system (Bio-Rad) using Pierce ECL Western Blotting substrate.
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2

Targeted Gene Deletion in P. aeruginosa

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Genomic DNA was isolated from WT and G2L4 knock-out P. aeruginosa AZPAE12409 by using a Quick-DNA Fungal/Bacterial Miniprep Kit (Zymo Research) according to the manufacturer’s protocol. The DNA was digested with PstI and EcoRI and run in a 1% agarose gel alongside a 1-kb Plus DNA Ladder (Invitrogen) that was 5’-labeled with [γ–32P]-ATP (6000 Ci/mmol; Perkin Elmer) using T4 polynucleotide kinase (New England Biolabs). After electrophoresis, the gel was blotted onto an Amersham Hybond-XL (Cytiva) membrane by overnight capillary transfer. The membrane was washed 3 times with 25 mL 6X SSC, dried, and UV irradiated to cross-link the DNA to the membrane (120 mJ; Stratalinker UV Crosslinker 2400). Hybridization was done with a 5’-labeled targetron probe (200 bp PCR product obtained using G2L4 RT targetron probe primers; Table S4) in a hybridization tube with Amersham Rapid-hybridization Buffer (Cytiva) for 2.5 h at 60°C. After washing twice with 2X SSC plus 0.1 % SDS, the membrane was dried and scanned with a phosphorimager (Typhoon FLA 9500; GE Healthcare).
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3

Profiling Genomic DNA in P. aeruginosa

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Genomic DNA was isolated from WT and G2L4 knock-out P. aeruginosa AZPAE12409 by using a Quick-DNA Fungal/Bacterial Miniprep Kit (Zymo Research) according to the manufacturer's protocol. The DNA was digested with PstI and EcoRI and run in a 1% agarose gel alongside a 1-kb Plus DNA Ladder (Invitrogen) that was 5'-labeled with [g-32 P]-ATP (6000 Ci/mmol; Perkin Elmer) usingT4 polynucleotide kinase (New England Biolabs). After electrophoresis, the gel was blotted onto an Amersham Hybond-XL (Cytiva) membrane by overnight capillary transfer. The membrane was washed 3 times with 25 mL of 6x SSC, dried, and UV irradiated to cross-link the DNA to the membrane (120 mJ; Stratalinker UV Crosslinker 2400). Hybridization was done with a 5'-labeled targetron probe (200 bp PCR product obtained using G2L4 RT targetron probe primers; Table S2) in a hybridization tube with Amersham Rapid-hybridization Buffer (Cytiva) for 2.5 h at 60˚C. After washing twice with 2x SSC plus 0.1 % SDS, the membrane was dried and scanned with a phosphorimager (Typhoon FLA 9500; GE Healthcare).
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