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Front. Microbiol., 13 September 2016 | https://doi.org/10.3389/fmicb.2016.01442

Complete Genome Sequence of Carbonic Anhydrase Producing Psychrobacter sp. SHUES1

Mengmeng Li1, Xuejiao Zhu1, Stephenson Wilkinson2, Minsheng Huang1 and Varenyam Achal1*
  • 1Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai, China
  • 2Department of Civil Engineering, University of Wolverhampton, Wolverhampton, UK

Recent advances in biotechnology have allowed the study of new bacterial strains, which can produce enzymes that can be used in the bioremediation of heavy metals. Microbially induced carbonate precipitation (MICP) is a recent well-recognized process that has the potential to precipitate heavy metals, mainly those with a valency of +2 (Kumari et al., 2016). There are two enzymes, urease, and carbonic anhydrase, that play an important role in the MICP process. The role of carbonic anydrase (EC 4.2.1.1) in MICP is generally underestimated and most of the studies in past mainly focus on urease-producing microorganisms (Li et al., 2013, 2014; Kumari et al., 2014).

In the present study, Psychrobacter sp. SHUES1 was isolated from frozen alkaline soil sample collected at Shanghai, China. This bacterium produced lipase and protease at 4°C in a plate assay. The ability of Psychrobacter sp. to show extracellular lipolytic activity at low temperatures is widely known (Xuezheng et al., 2010); however, the remarkable property of this strain was in the precipitation of heavy metals including cadmium and zinc in parallel to the MICP process. Therefore, to know the type of enzyme or genes involved in the process of metal precipitation, this research aims to sequence the whole genome of Psychrobacter sp. SHUES1, and thus provide a genomic insight into its behavior.

Genomic DNA from Psychrobacter sp. SHUES1 was extracted using the DNeasy Blood & Tissue Kit (Qiagen, USA), and its quantity and quality were evaluated on the Qubit. The extracted DNA was subjected to whole-genome shotgun sequencing using the NEBNext Ultra DNA Library Prep Kit (Illumina, San Diego, CA). Library construction was performed with the following process: DNA fragmentation, end repair, adding “A” to the 3′ end, adaptor ligation and amplification. After library construction, the generated cluster was sequenced on an Illumina HiSeq2500 sequencing system, according to a paired end 2 × 125 nt multiplex program. 13,716,515 raw reads resulted in 13,144,818 quality-filtered trimmed reads, yielding a not less than 3 Mb genome size. De novo genome assembly was performed using SPAdes-3.5.0. After purification, the assembly produced 3,115,590 bp of sequence across 115 contigs with an N50 of 47,049 bp, with a longest sequence of 182,144 bp, and a G+C content of 43.5% (Table 1). Gene prediction and annotation were carried out using Prodigal_v2.6.1, blastp in the National Center for Biotechnology Information (NCBI) “nr” database. Gene ontology (GO) functional annotation of genes was carried out using the blast2GO algorithm, dominated by the following features: biological process (44%), molecular process (42%), and cellular component (14%). Clusters of Orthologous Groups (COG) annotation was carried out in the NCBI COG database using rpsblast. A total of 2627 protein-coding genes, 45 tRNA-coding genes, and 6 rRNA genes were predicted in the draft genome.

TABLE 1
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Table 1. Genome features of Psychrobacter sp. SHUES1.

The most significant finding of the whole genome sequencing of Psychrobacter sp. SHUES1 was the presence of carbonic anhydrase gene in it. Carbonic anhydrase participates in all physiological processes dealing with CO2 and HCO3, such as cellular pH regulation, calcification, acid, and ion transport (Smith and Ferry, 2000; Achal and Pan, 2011). It catalyses the interconversion of CO2 and HCO3, which ultimately promotes the precipitation of calcium carbonate in the presence of Ca2+ ions. Although there are a number of genome sequences of Psychrobacter sp. deposited in NCBI database, this is the first characterization of the genome sequence of strain SHUES1, which produces carbonic anhydrase which has a significant role in metal bioremediation based on the ability to promote the precipitation of metal carbonates. This sequencing result also suggests the importance of carbonic anhydrase in the MICP process which is a novel element in this field of research.

The present study is especially valuable in the area of biomineralization based on MICP processes, in the bioremediation of metals and in the development of microbial concrete (biocement). Urease is the main enzyme responsible in such studies; however, in our study the urease gene was not present in Pyschrobacter sp. SHUES1. This indicates the importance of carbonic anhydrase, as a less studied secondary enzyme for the MICP process. It is hoped that this research will encourage other researchers to look for this carbonic anhydrase precipitation pathway when carrying out MICP studies.

Nucleotide Sequence Accession and Culture Collection Number

The Psychrobacter sp. SHUES1 whole genome shotgun (WGS) project has been deposited at DDBJ/ENA/GenBank under the accession LXWA00000000. The version described in this paper is version LXWA01000000, and consists of sequences LXWA01000001-LXWA01000115. The detail information and data related to sequences LXWA01000001-LXWA01000115 can be accessed as well as downloaded at http://www.ncbi.nlm.nih.gov/Traces/wgs/wgsviewer.cgi?val=LXWA01&search=LXWA01000000&display=contigs. This strain has also been deposited in the China General Microbiological Culture Collection Center (CGMCC 1.15733).

Author Contributions

ML and XZ, performed experiments; MH and VA, analyzed data; SW and VA, wrote manuscript.

Conflict of Interest Statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Acknowledgments

This work was supported by the National Natural Science Foundation of China under Grant number 41550110499.

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Keywords: whole genome sequencing, Psychrobacter sp., carbonic anhydrases, urease, biocement

Citation: Li M, Zhu X, Wilkinson S, Huang M and Achal V (2016) Complete Genome Sequence of Carbonic Anhydrase Producing Psychrobacter sp. SHUES1. Front. Microbiol. 7:1442. doi: 10.3389/fmicb.2016.01442

Received: 30 June 2016; Accepted: 30 August 2016;
Published: 13 September 2016.

Edited by:

Prayad Pokethitiyook, Mahidol University, Thailand

Reviewed by:

Christopher L. Hemme, University of Rhode Island, USA
Mark Sutherland, University of Bradford, UK

Copyright © 2016 Li, Zhu, Wilkinson, Huang and Achal. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Varenyam Achal, varenyam@re.ecnu.edu.cn