library_construction_protocol: Following overnight growth, 1 ml of saturated culture from each Tn library was pelleted at 8000xg for 2 minutes. Genomic DNA was extracted by Monarch Genomics DNA Preparation Kit (NEB) according to the manufacturer's protocol. The sequencing libraries for Next-generation sequencing were prepared using a customized three-step PCR protocol. Genomic DNA input was normalized to a concentration of 100 ng/μl. The initial transposon junction amplification (PCR1) was carried out using an arbitrary PCR amplification method. This step utilized a forward primer designed to align with one end of the transposon and three reverse arbitrary primers. The PCR1 process employed a 2-step cycling protocol with annealing temperatures set at 42°C and 58°C, and number of cycles at 6 and 15, respectively.  Subsequently, the second PCR step (PCR2) involved the addition of 16S adapters for Illumina indexing, along with unique molecular identifiers (UMI), and amplification of the library for 36 cycles. Post-PCR2 cleanup was performed using Aline PCRClean DX magnetic beads. The final PCR step (PCR3) incorporated NexteraXT indexing in accordance with the manufacturer's protocol. Post-indexed library (PCR3) cleanup was carried out using Aline PCRClean DX magnetic beads.