To confirm the mutant strain ΔgidA, we performed RT-PCR according to our previously reported methods (Tan et al., 2015 (link)). Briefly, RNA was isolated using SV Total RNA Isolation System (Promega, USA) according to the manufacturer's instructions. In addition, cDNA was synthesized using HiScript Q Select RT SuperMix (Vazyme, China) according to the manufacturer's instructions.
To confirm whether the upstream and downstream genes of gidA are unaffected and functioning normally, we designed the primers of SSU05_2162, gidA, and SSU05_2164 for RT-PCR (Table 2) from the cDNA.
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