(DY15, DY26, DC) Afe0022

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1 Vol.21 No.4 The Chinese Journal of Nonferrous Metals Apr (2011) (DY15, DY26, DC) Afe0022 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2 ( ) 3 Acidithiobacillus ferrooxidans (At. ferrooxidans) DY15 DY26 DC Cu 2+ Cu 2+ Real time RT(Reverse transcriptase) PCR Afe0022 Cu 2+ DY15 DY26 DC Cu mol/l 9K 3 DY15 DY26 DC ph 7 d DY h DY15 DY26 DC Fe 2+ 80% 100% 100% DY15 DY26 DC DY15 3 Cu 2+ Afe0022 Cu 2+ At. ferrooxidans Cu 2+ Q819 A Bioleaching of chalcopyrite by Acidithiobacillus ferrooxidans DY15, DY26 and DC and difference expressions of gene Afe0022 WU Xue-ling 1, 2, YUAN Peng 1, 2, HU Qi 1, 2, HOU Dong-mei 1, 2, MIAO Bo 1, 2, QIU Guan-zhou 1, 2 (1. School of Resources Processing and Bioengineering, Central South University, Changsha , China; 2. Key Laboratory of Biometallurgy, Ministry of Education, Central South University, Changsha , China) Abstract: The effects of different initial concentrations of Cu 2+ on chalcopyrite concentrate bioleaching and the difference of ability in response to copper ion (Cu 2+ ) were investigated with three strains of Acidithiobacillus ferrooxidans (At. ferrooxidans) DY15, DY26 and DC. The real time reverse transcriptase (RT) PCR was used to analyze the difference expression of gene Afe0022 cation channel protein in copper ion with different concentrations. The results show that strain DY15, DY26 and DC have the copper ion tolerance level of 0.40, 0.22 and 0.04 mol/l, respectively. When the elemental sulfur acts as the energy resource in 9K medium, the oxidation capacity of elemental sulfur of strain DY15 is better than that of elemental sulfur of DY26 and DC, and after 7 d, the ph values of DY15, DY26 and DC decline from 1.8 to 0.8, 1.2 and 1.3, respectively. All three strains can oxidize ferrous ions well, and after 40 h, the oxidation capacities of ferrous ions of three strains are 80% (DY15), 100% (DY26), and 100% (DC), respectively. In the leaching experiment, strain DY15 has the highest bioleaching efficiency on chalcopyrite concentrate while strain DC has the least bioleaching efficiency in the three strains, but the mixed cultures containing 3 strains exhibit the highest bioleaching efficiency than the pure cultures of DY15. The stronger the capacity of strain resistance to Cu 2+ is, the more the expression of gene Afe0022 is. This result assists interpretation of bacterium resistance to Cu 2+, and provides theoretical basis to study the mechanism of bacterium resistance to Cu 2+ in molecular level. Key words: Acidithiobacillus ferrooxidans; chalcopyrite concentrate bioleaching; sulfur oxidation; Cu 2+ resistance; difference expression xueling0714@yahoo.com.cn

2 21 4 (DY15, DY26, DC) Afe Acidithiobacillus ferrooxidans Fe 2+ [1 4] [5 7], [8 10] [11] Cu 2+ Cu 2+ Cu 2+ Cu 2+ [12] Cu 2+ 3 At. ferrooxidans Cu 2+ Fe 2+ Cu 2+ At. Ferrooxidans Fe 2+ At. ferrooxidans Real time RT-PCR Cu 2+ Afe0022 mrna (DC) (DY15 DY26) Fe 2+ (9K ) (NH 4 ) 2 SO g/l, KCl 0.1 g/l, K 2 HPO g/l, MgSO 4 7H 2 O 0.5 g/l, Ca(NO 3 ) g/l FeSO 4 7H 2 O 20 g/l ph cell/ml (K 2 Cr 2 O 7 ) Fe 2+ 1 ml 6 mmol/l K 2 Cr 2 O 7 (1.8 mg) 2 mg Fe 2+ Fe 2+ FeSO 4 7H 2 O 9K 10 g/l ph Cu 2+ Cu 2+ (0.02~0.42 mol/l) 9K 160 r/min 30 [13 14] (K 2 Cr 2 O 7 ) Fe 2+ Cu 2+ Fe mm 1 1 Table 1 Main components of chalcopyrite concentrate (mass fraction, %) S Zn Pb Fe Ca Cu Co Ni Mg K 150 g/l cell/ml [15 16] Cu 2+ ( mol/l) Cu r/min 30 ph d AA d Cu Real-time RT-PCR 3 Cu 2+ 9K (Fe 2+ 20%) 4 ( r/min) 10 min RNA TRIzol (Invitrogen) RNA RNeasy Mini Kit (Qiagen) RNA RNase-free DNase set (Qiagen) DNA (Revert Aid TM First Strand cdna Synthesis Kit MBI) cdna MyiQTM single color Real-time PCR Detection systerm (BIO-Rad) SYBR Green Realtime PCR MasterMix (QPK 201 YOBO Co.Ltd.)

3 Cu 2+ rrs (16s rdna) (Real-time)PCR Optical system software (Version 1.0) DY15 DY26 DC Cu mol/l( 1) 3 Cu 2+ DY15 Cu 2+ DC Cu 2+ Cu 2+ Cu Fe 2+ Fe 2+ DY15 DY26 DC 9K 7 d cell/ml cell/ml ph ( 2(a) (b)) DY15 DY26 DC Fe h DY15 DY26 DC cell/ml cell/ml cell/ml cell/ml( 2(c)) 40 h DY15 DY26 DC Fe 2+ 80% 100% 100% Fe 2+ DY15 Fe 2+ 3 DY15 Cu 2+ Fe 2+ DC Fe 2+ Cu 2+ ( 2(c) (d)) d Cu mol/l [17] DC Cu mol/l Cu mol/l 3 36 d 1 Cu 2+ Fe 2+ Fig.1 Oxidation curves of Fe 2+ at different initial Cu 2+ concentrations: (a) 0.40 mol/l, DY15; (b) 0.22 mol/l, DY26; (c) 0.04 mol/l, DC cell/ml cell/ml( 3) 3 36 d

4 21 4 (DY15, DY26, DC) Afe Fig.2 Growth(a) and sulfur oxidation(b) of 3 strains in 9K medium with different energy resources: (a), (b) Sulfur; (c), (d) FeSO 4 7H 2 O 3 Cu 2+ Fig.3 Growth curves of bacteria in leaching system at different initial Cu 2+ concentrations: (a) 0; (b) mol/l; (c) 0.05 mol/l

5 Cu 2+ 0 DY15 DY26 DC cell/ml cell/ml cell/ml cell/ml( 3(a)) DY15 9K DY cell/ml( 2(a)) Fe cell/ml( 2(c)) DY15 Cu mol/l DY cell/ml DY26( cell/ml) DC( cell/ml)( 3(b)) DY15 Cu Cu 2+ 0 Cu mol/l, mol/l Cu 2+ DC (0.04 mol/l) DC DY cell/ml DY15 ( cell/ml)( 3(c)) DY15 Cu Cu 2+ 6 d ( 4 Mix 3 ) Cu mol/l, 3 ( 4(b)) Cu 2+ ( Cu 2+ ) g (DY15) g (DY26) g (DC) Cu 2+ 0 ( 4(a)) Cu 2+ ( mol/l) 3 Cu mol/l ( 4(c)) 3 ( 3(c)) DY15 DY26 DC 3 DY15 Fe 3+ 4 Cu 2+ Cu 2+ Fig.4 Cu 2+ leaching curves in leaching system at different initial Cu 2+ concentrations: (a) 0; (b) mol/l; (c) 0.05 mol/l CuFeS 2 +4Fe 3+ Cu 2+ +2S 0 +5Fe 2+ (At. ferrooxidans) Fe 2+ S Cu 2+ 4(a) (b) DY15

6 21 4 (DY15, DY26, DC) Afe Fe 2+ DY15 Cu 2+ Cu 2+ (0.05 mol/l)( 4(c)) DY15 DY26 DY15 Fe 2+ DY15 DY26 [18] 2.4 Cu 2+ 3 Afe0022 DC DY26 DY15 Cu 2+ Afe Cu 2+ Cu 2+ Afe0022 DC DY26 DY15 Cu 2+ Afe0022 Cu Cu 2+ Afe0022 DY15 Afe DC Cu 2+ DC Cu 2+ Cu 2+ Afe0022 Cu 2+ 2 Cu 2+ Afe0022 Table 2 Difference expression of Afe0022 in At. ferrooxidans strain DC and DY26 under different Cu 2+ concentrations Bacteria At. ferrooxidans strain DC At. ferrooxidans strain DY26 Cu 2+ concentration/ (mol L 1 ) Fold expression Afe Afe0022 Cu 2+ Cu mol/l 3 Afe0022 DC DY DY Cu 2+ Cu 2+ Cu 2+ Cu 2+ Cu 2+ Afe0022 Cu ) 3 At. ferrooxidans DY15 DY26 DC Cu 2+ Fe 2+ Cu mol/l 0.22 mol/l 0.04 mol/l DY15 DY26 DC Fe 2+ DY15 DY26 DC 2) 3 DY15 Cu 2+ DY15 Cu 2+ 3) Cu 2+ DY15 DY26 DC Fe 2+ 4) Cu 2+ Cu 2+ Afe0022 Cu 2+ Cu 2+ Afe0022 Cu 2+ Cu 2+ REFERENCES At. ferrooxidans strain DY [1] SASAKI K, NAKAMUTA Y, HIRAJIMA T, TUOVINEN O H. Raman characterization of secondary minerals formed during chalcopyrite leaching with Acidithiobacillus ferrooxidans[j]. Hydrometallurgy, 2009, 95:

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15-17 September 2007 Beijing, China. Theme: Care for Life & Health: Scientific Therapeutics and Prevention for Cancer.

15-17 September 2007 Beijing, China. Theme: Care for Life & Health: Scientific Therapeutics and Prevention for Cancer. 2007 Asia-Pacific Conference of Tumor Biology and Medicine with 1st Oncology Summit of General Hospital of the Chinese People s Liberation Army and 2nd Chinese Middle-Age and Youth Oncologist Forum 15-17