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2 protocols using 5 deoxyadenosine

1

Purification of Methyltransferase Enzymes

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Luria Bertani (LB) media was purchased from Oxoid Limited (Hampshire, UK). Acetonitrile was purchased from Concord Technology (Minnesota, USA). Formic acid was purchased from Merck (New Jersey, USA). Skatole, S-(5′-Adenosyl)-l-methionine iodide, and 5′-deoxyadenosine were purchased from Sigma Aldrich (Saint Louis, USA). Trifluoroacetic acid and 2,3-dimethylindole were purchased from J&K (Beijing, China). Talon resin was purchased from Clonetech laboratories Inc. (California, USA). All protein purification chromatographic experiments were performed on an ÄKTA pure or ÄKTA prime plus FPLC machines equipped with appropriate columns (GE Healthcare, USA). Protein concentrations were calculated from the absorption at 280 nm measured using an Eppendorf BioPhotometer® D30. Anaerobic experiments were conducted in a Lab2000 glovebox (Etelux) under an atmosphere of N2 with less than 10 ppm O2.
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2

Capillary-Based Silica Functionalization for Nucleoside Analysis

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Fused-silica capillary (250 μm i.d. × 360 μm o.d.) was purchased from Yongnian Optic Fiber Plant (Hebei, China). Tetramethoxysilane (TMOS) and 3-mercaptopropyltrimethoxysilane (MPTMS) were purchased from Wuhan University Silicone New Material (Wuhan, China). Azobisisobutyronitrile (AIBN) and poly(ethylene glycol) with the molecular weight of 6000 (PEG-6000) were all purchased from Shanghai Chemical Reagent Corporation (Shanghai, China). AIBN was purified by recrystallization from ethanol at 40°C. 3-acrylamidophenylboronic acid (AAPBA) and creatinine were purchased from Sigma-Aldrich (Beijing, China). Organic solvents were all of HPLC grade. The water used throughout all experiments was purified using a Milli-Q apparatus (Millipore, Bradford, USA). All other reagents were obtained from various commercial sources and were of analytical grade unless otherwise indicated.
2′-Deoxycytidine (dC), 2′-deoxyguanosine (dG), 2′-deoxyadenosine (dA), thymidine (T), cytidine (rC), guanosine (rG), adenosine (rA), uridine (rU), 1-methyladenosine, N6-methyladenosine, 5′-deoxyadenosine, inosine, xanthosine, 3-methylcytidine, N4-acetylcytidine, 5-methyluridine, 3-methyluridine, pseudouridine, double hydrogen zeatin-riboside (DHzR) were purchased from Sigma-Aldrich (Beijing, China). The standard solution of each analyte was prepared at 1.0 mg/mL in H2O and stored at −20°C.
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