For RNA extraction, the strain
R. anatipestifer ATCC 11845 was grown in TSB medium and TSB medium containing 40 μM EDDHA, 1 mM MnCl
2, 400 μM ZnSO
4, and 200 μM CuCl
2.
R. anatipestifer ATCC 11845 and
R. anatipestifer ATCC 11845 Δ
fur were grown in TSB medium. All the strains were grown at 37°C and 180 rpm until the exponential phase. Then, 6 × 10
9 CFU (1 OD
600 = 2 × 10
9 CFU) (22 (
link)) of the cells was mixed with 1 mL
RNAprotect bacterial reagent (Qiagen, 76506), and the total RNA was isolated using the
RNeasy Protect Bacteria minikit (Qiagen, 74524) as described in a previous study (28 (
link)). cDNA was synthesized from 1,000 ng template RNA with
HiScript QRT SuperMix for quantitative PCR (qPCR) (Vazyme, R123-01). The cDNA was quantified by real-time PCR using
SYBR green master mix (Vazyme, Q111-01) on a
CFX Connect real-time system (Bio-Rad), and the mRNA levels of the
feoA and
feoB genes were normalized to those of 16S rRNA as described in a previous study (60 (
link)). Experiments were performed in triplicate using three biological replicates.
Huang M., Wang M., Feng Y., Wang M., Gao Q., Zhu D., Jia R., Chen S., Zhao X., Yang Q., Wu Y., Zhang S., Tian B., Huang J., Ou X., Mao S., Sun D., He Y., Wu Z., Cheng A, & Liu M. (2023). Functional Characterization of FeoAB in Iron Acquisition and Pathogenicity in Riemerella anatipestifer. Microbiology Spectrum, 11(4), e01373-23.