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Identification and Analysis of a Novel Gene Cluster Involves in Fe2+ Oxidation in Acidithiobacillus ferrooxidans ATCC 23270, a Typical Biomining Acidophile

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Abstract

Iron-oxidizing Acidithiobacillus spp. are applied worldwide in biomining industry to extract metals from sulfide minerals. They derive energy for survival through Fe2+ oxidation and generate Fe3+ for the dissolution of sulfide minerals. However, molecular mechanisms of their iron oxidation still remain elusive. A novel two-cytochrome-encoding gene cluster (named tce gene cluster) encoding a high-molecular-weight cytochrome c (AFE_1428) and a c4-type cytochrome c552 (AFE_1429) in A. ferrooxidans ATCC 23270 was first identified in this study. Bioinformatic analysis together with transcriptional study showed that AFE_1428 and AFE_1429 were the corresponding paralog of Cyc2 (AFE_3153) and Cyc1 (AFE_3152) which were encoded by the extensively studied rus operon and had been proven involving in ferrous iron oxidation. Both AFE_1428 and AFE_1429 contained signal peptide and the classic heme-binding motif(s) as their corresponding paralog. The modeled structure of AFE_1429 showed high resemblance to Cyc1. AFE_1428 and AFE_1429 were preferentially transcribed as their corresponding paralogs in the presence of ferrous iron as sole energy source as compared with sulfur. The tce gene cluster is highly conserved in the genomes of four phylogenetic-related A. ferrooxidans strains that were originally isolated from different sites separated with huge geographical distance, which further implies the importance of this gene cluster. Collectively, AFE_1428 and AFE_1429 involve in Fe2+ oxidation like their corresponding paralog by integrating with the metalloproteins encoded by rus operon. This study provides novel insights into the Fe2+ oxidation mechanism in Fe2+-oxidizing A. ferrooxidans ssp.

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(The electron transfer chains consisted with the metalloproteins encoded by rus and pet I operon were adapted from the previous studies [6, 29])

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 31470230, 51320105006, 51604308) and the Natural Science Foundation of Hunan Province (2015JJ2165).

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  1. Chenbing Ai and Yuting Liang have contributed equally to this work.

Authors and Affiliations

  1. School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, Hunan, China

    Chenbing Ai, Yuting Liang, Bo Miao, Weimin Zeng & Guanzhou Qiu

  2. Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, 410083, China

    Chenbing Ai, Yuting Liang, Bo Miao, Weimin Zeng & Guanzhou Qiu

  3. CSIRO Process Science and Engineering, Clayton, VIC, Australia

    Miao Chen & Weimin Zeng

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Ai, C., Liang, Y., Miao, B. et al. Identification and Analysis of a Novel Gene Cluster Involves in Fe2+ Oxidation in Acidithiobacillus ferrooxidans ATCC 23270, a Typical Biomining Acidophile. Curr Microbiol 75, 818–826 (2018). https://doi.org/10.1007/s00284-018-1453-9

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