- Extended genome report
- Open Access
Draft genome sequence of Acidithiobacillus thiooxidans CLST isolated from the acidic hypersaline Gorbea salt flat in northern Chile
Standards in Genomic Sciencesvolume 12, Article number: 84 (2017)
Acidithiobacillus thiooxidans CLST is an extremely acidophilic gamma-proteobacteria that was isolated from the Gorbea salt flat, an acidic hypersaline environment in northern Chile. This kind of environment is considered a terrestrial analog of ancient Martian terrains and a source of new material for biotechnological applications. A. thiooxidans plays a key role in industrial bioleaching; it has the capacity of generating and maintaining acidic conditions by producing sulfuric acid and it can also remove sulfur layers from the surface of minerals, which are detrimental for their dissolution. CLST is a strain of A. thiooxidans able to tolerate moderate chloride concentrations (up to 15 g L−1 Cl−), a feature that is quite unusual in extreme acidophilic microorganisms. Basic microbiological features and genomic properties of this biotechnologically relevant strain are described in this work. The 3,974,949 bp draft genome is arranged into 40 scaffolds of 389 contigs containing 3866 protein-coding genes and 75 RNAs encoding genes. This is the first draft genome of a halotolerant A. thiooxidans strain. The release of the genome sequence of this strain improves representation of these extreme acidophilic Gram negative bacteria in public databases and strengthens the framework for further investigation of the physiological diversity and ecological function of A. thiooxidans populations.
The genus Acidithiobacillus comprises a group of obligatory acidophilic, Gram negative, rod shaped bacteria that derive energy from the aerobic oxidation of reduced sulfur compounds (RISCs) to support autotrophic growth. In the process of oxidizing RISCs, these bacteria produce sulfuric acid and contribute to the bioleaching of ores. Currently, the genus comprises seven described species, A. thiooxidans ATCC 19377, Acidithiobacillus ferrooxidans ATCC2327, Acidithiobacillus albertensis ATCC35403, Acidithiobacillus caldus DSM 8584 , Acidithiobacillus ferrivorans , Acidtithiobacillus ferridurans  and Acidithiobacillus ferriphilus . Despite being the first acidophile ever isolated , A. thiooxidans investigation lags behind other members of the genus, especially when compared to the iron oxidizer A. ferrooxidans , for which extensive knowledge on its basic ecophysiology and biotechnological use has been gathered .
The draft genomes of ten isolates of A. thiooxidans are available: the type strain ATCC 19377 obtained from the Kimmeridge clay formation in England , the strain DSM 17318 named Licanantay isolated from a copper mine in northern Chile , the A01 strain isolated from wastewater of a coal dump in China  and seven other isolates obtained from copper mines (BY-02, DXS-W, GD1-3, TYC-17, ZBY) and coal heaps (A02, DMC) in China .
The A. thiooxidans type strain (ATCC 19377) is motile, grows on elemental sulfur, thiosulfate or tetrathionate, and has temperature optimum of 30 °C and a pH optimum of 2.0 to 3.0 . Members of the species have been found to occur in a variety of natural-acidic and man-made environments, including sulfidic caves , shales , fresh water , sea water , sewer pipes , mineral leaching heaps , mine dumps  and mine wastes  from different parts of the world. With the exception of A. thiooxidans strain SH isolated from sea water, which has a confirmed requirement of NaCl (2%; 0.35 M) for growth in synthetic media , all characterized A. thiooxidans strains are inhibited by even moderate NaCl concentrations .
A. thiooxidans CLST is a new NaCl tolerant strain (15 g L−1 Cl−) isolated from the Gorbea salt flat in the Central Andean plateau (Bolivia, Chile and Argentina, between 19° and 27° S latitude). This salt flat is located in an endorheic basin displaying strongly acidic brines (with a pH between 2 and 4 and a salinity ranging between 1.7 - 76.9 g L−1 NaCl) and one of the few acid saline systems known worldwide [20,21,22]. These uncommon types of natural extreme environments are considered terrestrial analogs to certain ancient Martian terrains and a source of new material for biotechnological applications [23, 24].
This work reports the microbiological properties of this NaCl-tolerant acidophilic sulfur-oxidizing Acidithiobacillus from the saline environment in northern Chile, together with its draft genomic sequence and annotation. The release of the genome of the CLST strain will contribute to a better understanding of the ecophysiology of extreme acidophiles inhabiting saline environments and of sodium-requiring processes (e.g. symport, antiport, flagellar rotation, etc.), in acidophilic chemolithotrophic bacteria. Knowledge derived from the study may also provide new opportunities in biotechnological and astrobiological endeavors.
Classification and features
A. thiooxidans CLST was isolated at the Biotechnology Center (CBAR-UCN) from a sulfur enrichment culture designed to select acidophilic bacteria that could oxidize RISCs under saline conditions. Briefly, salt-water samples obtained from the Gorbea salt flat were inoculated in a batch reactor containing minimal medium  and elemental sulfur as energy source. Phylogenetic analysis of the 16S rRNA sequence indicated that the CLST strain (DSM 103717) is related to A. thiooxidans (Fig. 1). CLST cells are Gram-negative, rod-shaped (0.4 μm × 1-1.5 μm) and motile (Fig. 2). Optimal growth occurs at 28 °C and pH 1.7. It grows autotrophically using sulfur as electron donor and oxygen as the electron acceptor. It is also a facultative anaerobe capable of using RISCs as electron donors and ferric iron as an electron acceptor. Strain CLST forms small white colonies when grown autotrophically on solid medium containing RISCs. It differs from closely related strains, Licanantay and A01 (JMEB00000000 and FJ154514, respectively), in its capacity to grow in 15 g L−1 of chloride. The microorganism information is presented in Table 1.
Extended feature descriptions
The growth rate of A. thiooxidans type strain ATCC 19377 undergoes a significant decrease (μ from 0.76 to 0.52 day−1) at NaCl concentration of 325 mM compared with growth on culture medium without the salt (Additional file 1: Figure S1). Meanwhile there is not a significant change in the growth rate of A. thiooxidans CLST in the same conditions. In addition A. thiooxidans CLST precipitates CuS when it is grown aerobically in culture medium amended with CuSO4 (Additional file 2: Figure S2). This feature has been already observed in E. coli associated to the heterologous expression of the enzyme cysteine desulfhydrase . We identified the gene for a previously described cysteine desulfhydrase (CdsH) in the genome of A. thiooxidans CLST strain. CdsH appears to be the major cysteine-degrading and sulfide-producing enzyme aerobically but not anaerobically .
Genome sequencing information
Genome project history
The organism was selected for sequencing on the basis of its phylogenetic position and 16S rRNA similarity to members of the genus Acidithiobacillus , and for its atypical origin; coming from an extreme acidic and saline biotope. This Whole Genome Shotgun project has been deposited at GenBank under the accession number LGYM00000000. The version described in this paper is the first version, LGYM00000000. The project information is presented in Table 2.
Growth conditions and genomic DNA preparation
The culture obtained from this reactor grew at 15 g L−1 Cl− and exhibited sulfur oxidizing activity. Strain CLST was isolated by plating the reactors culture medium using Phytagel 1% as gelling agent. Strain CLST was grown in minimal medium (0.4 g L−1, (NH4) 2SO4, 0.4 g L−1, MgSO4 × 7H2O, 0.2 g L−1, K2HPO4 and 3.93 g L−1, CuSO4, pH 1.7) containing NaCl (24.7 g L−1). After successive subculturing (three times), DNA was isolated using High Pure Template Preparation Kit (Roche, Germany) according to the manufacturer instructions.
Genome sequencing and assembly
The genome of A. thiooxidans strain CLST was sequenced at Beckman Coulter Genomics using 454 sequencing technology and mate pair libraries with insert sizes of ~500 bp . Pyrosequencing reads were assembled de novo using Newbler (v2.0.01.14). The final draft assembly contained 389 contigs in 40 scaffolds ranging in size from 2298 bp to 409,853 bp. The total size of the genome is ~3,9 Mbp and the final assembly is based on 82 Mbp of 454 data, which provides an average 36× coverage of the genome.
Genes were predicted using Glimmer 3.02  as part of the RAST annotation pipeline . The tRNA and tmRNA identification was achieved using ARAGORN v1.2.36  and the rRNA prediction was carried out with HMMER3 . Additional gene prediction analysis and manual functional annotation was performed at the Center for Bioinformatics and Genome Biology (CBGB-FCV). The predicted CDSs were used to search the NCBI non-redundant database, UniProt, TIGRFam, Pfam, PRIAM, KEGG, COG and InterPro databases. Protein coding genes were analyzed for the presence of signal peptides using SignalP v4.1  and transmembrane helices using TMHMM v2.0 .
The draft genome contains 3,974,949 nucleotides and has an average G + C content of 48.8% (Table 3). From a total of 3941 genes, 3866 are predicted to be protein coding genes and 75 are RNA genes. The RNA genes partitioned into 1 tmRNA, 1 rRNA operon and 71 tRNAs distributed in 17 scaffolds (40% of which map to a single scaffold), suggesting the presence of an additional complete set of tRNAs as in the case of strain Licanantay  and A. ferrooxidans type strain (ATCC 23270) . Predicted protein functional distributions follow highly similar profiles of other A. thiooxidans sequenced strains according to COG classification, with 36% of the genes being related to metabolism, 26% to information flux and 15% to cellular structure maintenance. A total of 43.63% of the genes were assigned a putative function while the remaining were annotated as hypotheticals. The distribution of genes in COGs functional categories is presented in Table 4.
Insights from the genome sequence
A. thiooxidans CLST predicted gene complement was compared against the genome of the type strain of the species (ATCC 19377) and the publically available draft genomes of nine additional strains using the sequence based comparison tools of RAST [36, 37]. CLST shares 86% of its gene complement with the most similar strain in the set (Licanantay) and little over 70% with the type strain of the species (ATCC 19377 T). All diagnostic features of A. thiooxidans strains [1, 38, 39] are encoded in the core genome, and have been described elsewhere [7,8,9,10]. The exclusive gene complement of strain CLST encompasses 200 protein-coding genes, 95% of which are hypotheticals. An additional 1234 genes are partially shared with a subset of the strains under comparison (Fig. 3) and thus constitute the flexible gene complement. A number of these exclusive genes can be linked to osmotolerance responses, including active uptake of potassium (kdpFABC), synthesis of the counterion glutamate (glutamate synthase), synthesis of compatible solutes such as the aminoacid Proline (proQ) and possibly also polyamines (carbamoyl-phosphate synthase). Several genes involved in mitigation of other types of stress also formed part of the flexible gene pool of the CLST strain, including the ruberythrin gene cluster and a non-heme chloroperoxidase involved in oxidative stress resistance , copper and mercury resistance genes to withstand metal toxicity  and genes for the export of protective extracellular polysaccharides (kps system) . Besides, these functions and an extensive number of hypotheticals, the CLST flexible gene complement also includes a variety of functions linked mobile genetic elements of diverse nature , suggesting that many of the differentiating features of CLST may have been horizontally transferred from other members of the microbial community.
This work reports the first draft genome and annotation of a halotolerant acidophilic sulfur-oxidizing Acidithiobacillus (A. thioooxidans strain CLST), together with its basic microbiological properties and fundamental metadata from the saline environment in northern Chile from which it was isolated. The 3.9 Mbp draft genome sequence of strain CLST is arranged in 40 high quality scaffolds, being 24% larger than the genome of the type strain and resembling in size other industrial isolates recently sequenced. It encodes 75 RNAs and 3866 predicted protein-coding genes, 43% of which were assigned putative functions. Over one third of the gene complement is flexible, being represented in few strains other than CLST. Several of the exclusive genes identified in this study can be linked to osmotolerance and other stress responses. Further study of these and other features will likely provide new insights into sodium-requiring processes in acidophilic chemolithotrophic bacteria and further understanding of the mechanisms used by acidophilic bacteria to endure high osmotic stress in natural and industrial saline environments. The release of the genome sequence of this strain improves the representation of these extreme acidophilic Gram negative bacteria in public databases and strengthens the framework for further investigation of the physiological diversity and ecological function of A. thioooxidans.
American Type Culture Collection
Centro de Biotecnología “Profesor Alberto Ruiz”, Universidad Católica del Norte
Deutsche Sammlung von Mikroorganismen
Fundación Ciencia & Vida
Reduced Inorganic Sulfur Compound
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We would like to acknowledge Dr. Francisco Remonsellez, Dr. Cristina Dorador and Mónica Gonzalez for technical assistance.
This work was performed under the auspices of the following projects: Innova CORFO 08CM01-03, Joint BHP Billiton – UCN – FCV Phase I, Fondecyt 1,140,048, Fondecyt 1,130,683, Fondecyt 1,100,795, Basal PFB 16.
The author(s) declare(s) that they have no competing interests.
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About this article
- Sulfur oxidization
- Flexible gene complement
- Mars analog
- Salar de Gorbea