Chinese Science Bulletin

, Volume 59, Issue 3, pp 301–309 | Cite as

Proteomic and molecular investigations revealed that Acidithiobacillus caldus adopts multiple strategies for adaptation to NaCl stress

  • Xu Guo
  • Chengying JiangEmail author
  • Yuanming Luo
  • Mingjiang Zhang
  • Ansgar Poetsch
  • Shuangjiang LiuEmail author
Article Microbiology


Acidithiobacillus caldus plays an important role in commercial bioleaching. To understand how NaCl stress adaptation occurs in A. caldus, we grew A. caldus strain SM-1 in media containing high NaCl concentrations. SM-1 grew at concentrations of up to 1.0-mol L−1 NaCl, but growth was severely inhibited at higher concentrations. Proteomic analysis showed that SM-1 used multiple strategies to respond to NaCl stress. In addition to several heat-shock proteins, enzymes involved in proline biosynthesis increased under NaCl stress. In addition, two DNA-binding proteins and a third protein of unknown function (Atc_1291), which was subsequently identified as a putative single-stranded DNA-binding protein, were up-regulated in the presence of NaCl stress. These DNA-binding proteins might play a role in response to osmotic stress. Atc_1291 was cloned and expressed in Escherichia coli. Surprisingly, we found that E. coli BL21/pET28a-atc_1291 grew to higher cell densities than E. coli BL21/pET28a, regardless of NaCl stress. Homologs to Atc_1291 were identified in several groups of Proteobacteria. The role of Atc_1291 in enhancing cell growth needs further investigation.


Acidithiobacillus caldus SM-1 NaCl stress Proline Single-stranded DNA-binding proteins Bioleaching 



This work was supported by the National High Technology Research and Development Program of China (2012AA061501), the National Key Basic Research and Development Program of China (2010CB630903) and the National Natural Sciences Foundation of China (31171234).


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Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.State Key Laboratory of Microbial Resources, Institute of MicrobiologyChinese Academy of SciencesBeijingChina
  2. 2.Environmental Microbiology and Biotechnology Research Center, Institute of MicrobiologyChinese Academy of SciencesBeijingChina
  3. 3.University of Chinese Academy of SciencesBeijingChina
  4. 4.Lehrstuhl for Biochemie der PflanzenRuhr UniversitaetBochumGermany

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