Name: GSM6947268
Instrument: Illumina HiSeq 4000
Strategy: OTHER
Source: TRANSCRIPTOMIC
Selection: other
Layout: PAIRED
Construction protocol: For E. coli and G. metallireducens monocultures, total RNA extractions were performed using Trizol according to the manufacturer's protocol. RNA was extracted from F. succinogenes strain UWB7 monoculture & co-culture pellets using the RNeasy Mini Kit following the protocol for purification of total RNA from plant cells and tissues and filamentous fungi, using liquid N2 method of cell lysis, QIAshredder homogenization, on-column DNase I digestion, and elution in 30 µL of RNAse-free water. (1) Overview: EMBR-seq libraries were prepared according to the protocol described in Wangsanuwat et al. 100 ng of total RNA were used as input material for all libraries. For the libraries denoted “EMBR-seq” and “EMBR-seq+”, blocking primers were added during the polyadenylation step and reverse transcription step. For the libraries denoted “No depletion” and “RNase H”, water was added instead of blocking primers during these two steps. In the libraries denoted “RNase H” and “EMBR-seq+”, the RNase H treatment was performed as described below. In the libraries denoted “No depletion” and “EMBR-seq”, the RNase H treatment was skipped; the amplified RNA (aRNA) product of in vitro transcription (IVT) was used directly for the library reverse transcription step as described in Wangsanuwat et al. (2) Polyadenylation: 2 μL of total RNA (50 ng/μL) was mixed with 1 μL of 5x first strand buffer [250 mM Tris-HCl (pH 8.3), 375 mM KCl, 15 mM MgCl2, comes with Superscript II reverse transcriptase, Invitrogen Cat. # 18064014], 1 uL of blocking primer mix, 0.1 μL 10 mM ATP, and 0.1 μL E. coli poly-A polymerase (New England Biolabs, Cat. # M0276S). The samples were incubated at 37°C for 10 mins. In the “No depletion” and “RNase H” libraries, 1 μL of nuclease-free water was added instead of the blocking primer mix. (3) Reverse transcription: The polyadenylation product was mixed with 0.5 μL 10 mM dNTPs (New England Biolabs, Cat. # N0447L), 1 μL reverse transcription primers (25 ng/μL, Supplementary Table 2), and 1.3 μL blocking primer mix, and heated to 65°C for 5 mins, 58°C for 1 min, and then quenched on ice. In the “No depletion” and “RNase H” libraries, 1.3 μL of nuclease-free water was added instead of the blocking primer mix. This product was then mixed with 1.2 μL 5x first strand buffer, 1 μL 0.1 M DTT, 0.5 μL RNaseOUT (Thermo Fisher Scientific, Cat. #10777019), and 0.5 μL Superscript II reverse transcriptase, and then incubated at 42°C for 1 hr. Immediately afterwards, the samples were heat-inactivated at 70°C for 10 mins. (4) Second strand synthesis: The reverse transcription product was mixed with 33.5 μL nuclease-free water, 12 μL 5x second strand buffer [100 mM Tris-HCl (pH 6.9), 23 mM MgCl2, 450 mM KCl, 0.75 mM β-NAD, 50 mM (NH4)2SO4, Invitrogen, Cat. # 10812014], 1.2 μL 10 mM dNTPs, 0.4 μL E. coli ligase (Invitrogen, Cat. # 18052019), 1.5 μL DNA polymerase I (Invitrogen, Cat. # 18010025), and 0.4 μL RNase H (Invitrogen, Cat. # 18021071), and incubated at 16°C for 2 hrs. The cDNA was purified with 1x AMPure XP DNA beads (Beckman Coulter, Cat. # A63881) and eluted in 24 μL nuclease-free water that was subsequently concentrated to 6.4 μL. (5) In vitro transcription: The product from the previous step was mixed with 9.6 μL of in vitro transcription mix (1.6 μL of each ribonucleotide, 1.6 μL 10x T7 reaction buffer, 1.6 μL T7 enzyme mix, MEGAscript T7 Transcription Kit, Thermo Fisher Scientific, Cat. # AMB13345) and incubated at 37°C for 13 hrs. The IVT product was mixed with 6 μL ExoSAP-IT PCR Product Cleanup Reagent (Thermo Fisher Scientific, Cat. # 78200.200.UL) and incubated at 37°C for 15 mins. Next, it was treated with 5.5 μL fragmentation buffer (200 mM Tris-acetate (pH 8.1), 500 mM KOAc, 150 mM MgOAc) at 94°C for 3 mins and immediately quenched with 2.75 μL stop buffer (0.5 M EDTA) on ice. The fragmented aRNA was size-selected with 0.8x AMPure RNA beads (RNAClean XP Kit, Beckman Coulter, Cat. # A63987) and eluted in 18 μL nuclease-free water. In the libraries denoted “No depletion” and “EMBR-seq”, the fragmented and cleaned-up in vitro transcription product was used directly for Illumina library preparation by reverse transcription and PCR, as described previously (18, 30). In the “