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Draft genome sequence of silver nanoparticle producing bacterium Paenibacillus anseongense MAH-34T
Korean J. Microbiol. 2020;56(4):394-396
Published online December 31, 2020
© 2020 The Microbiological Society of Korea.

Muhammad Zubair Siddiqi1,2, Sathiyaraj Srinivasan3, Ramesh Subramani4, Wan-Taek Im1,2, and Md. Amdadul Huq5*

1Department of Biotechnology, Hankyong National University, Anseong 17579, Republic of Korea
2AceEMzyme Co., Ltd., Academic Industry Cooperation, Anseong 17579, Republic of Korea
3Department of Bio & Environmental Technology, College of Natural Science, Seoul Women’s University, Seoul 01797, Republic of Korea
4School of Biological and Chemical Sciences, Faculty of Science, Technology & Environment, The University of the South Pacific, Laucala Campus, Private Mail Bag, Suva, Republic of Fiji
5Department of Food and Nutrition, College of Biotechnology and Natural Resource, Chung-Ang University, Anseong 17546, Republic of Korea
Correspondence to: E-mail: amdadbge@gmail.com;
Tel.: +82-31-670-4568
Received July 27, 2020; Revised October 13, 2020; Accepted October 14, 2020.
Abstract
A bacterial strain MAH-34T was isolated from rhizosphere soil of magnolia flower tree. The isolate can grow on R2A agar/ broth at 10~37°C with optimum growth at 28~30°C and pH 7.0 without NaCl supplement. The MAH-34T was responsible for the silver nanoparticle (AgNP) production via hydrolysis of AgNO3. Thus, to know about the nitrate reductase genes, the genome analysis of Paenibacillus anseongense MAH-34T was carried out. The assembled genome of MAH-34T consists of 42 scaffolds with a total of 8,647,101 bp with N50 and N75 values of 553,491 and 230,930, respectively. The DAN G + C content was 46.0 mol%. Additionally, the genome annotation also shows the nitrate and/or nitrite reductase genes using the Rapid Annotation using Subsystem Technology (RAST), which may be responsible for the production of silver nanoparticle (AgNP) through the hydrolysis of AgNO3.
Keywords : Paenibacillus anseongense, genome analysis, nitrate reductase, RAST, rhizosphere soil
Body

Previously, the genus Paenibacillus was considered as a common member of genus Bacillus. However, based on its unique phenotypic and genotypic characteristics, the Paenibacillus was proposed as a separate genus in 1993 (Ash et al., 1993). Members of this genus are Gram-stain variable, aerobic, motile rods, and endospore-forming. Currently, the genus contained 296 species and 4 sub-species (https://lpsn.dsmz.de), which have been isolated from various environmental samples including soil, clinical specimens, fresh and saltwater, flowers, forage, and insect larvae (Huang et al., 2014; Siddiqi et al., 2015, 2017; Sáez-Nieto et al., 2017; Huq, 2020). Many research studies describe the importance of the members of the genus Paenibacillus which produce various metabolites, catalyze a wide variety of synthetic reactions in both cosmetics and biofuel production. Therefore, the species of the genus Paenibacillus have achieved the importance in agriculture, industrial and medical applications (Konishi and Maruhashi, 2003).

The microbial reduction of valuable metal ions such as silver, platinum, gold, and palladium into metallic nanoparticles has been reported previously (Hennebel et al., 2009; Lin et al., 2014). Among these nanoparticles, the silver nanoparticles (AgNPs) are used progressively in various fields, including, food, biosensors, medical, consumer, health care, and industrial purposes due to their unique chemical and physical properties (Majdalawieh et al., 2014; Singh et al., 2015).

Therefore, here we report several nitrate reductase genes from the genome analysis of MAH-34T, which may be responsible for the production of silver nanoparticles (AgNPs) via the hydrolysis of AgNO3. The strain MAH-34T was isolated from rhizosphere soil of magnolia tree in Anseong city Republic of Korea (37° 00' 39''N 127° 22' 79''E). The isolate grows well on R2A agar medium at 10~37°C (optimum growth at 28~30°C) with a pH range 6.0~9.5 (optimum pH 7.0) (Huq, 2020). The genomic and phylogenetic analysis put the strain MAH-34T within the genus Paenibacillus.

Presently, the complete or draft genome sequence analysis plays a key role in the description of novel bacterial species and target gene identification. As the strain MAH-34T was positive for the production of silver nanoparticles (AgNPs) by the hydrolysis of AgNO3 (Huq, 2020). Therefore, to identify the nitrate and/or nitrite reductase genes, the strain MAH-34T was subjected to whole-genome sequencing analysis.

The genomic DNA of strain MAH-34T was then extracted and purified as described by Marmur (1961), with some modifications. A genomic library was constructed using a TruSeq DNA PCR-free library preparation kit (Illumina) according to the manufacturer’s instructions and sequenced on the Illumina HiSeq-XTen platform to generate 302-bp paired-end reads. High-quality sequence fragments (2,962,264 paired-end reads, total of 785 Mb, and 62-fold coverage of the genome) were then assembled using SOAPdenovo v. 3.10.1. Genome annotation and analysis were performed using the NCBI Prokaryotic Genome Automatic Annotation Pipeline (PGAP, http://www.ncbi.nlm.nih.gov/books/NBK174280/) and RAST (Overbeek et al., 2014). The project information is available from the Genomes OnLine Database.

The assembled genome of Paenibacillus anseongense strain MAH-34T contained 42 scaffolds with a total of 8,647,101 bp (G + C content, 46.0%), an N50 value of 553,491 bp, an average sequencing depth of 62, and maximum contig lengths of 1,491,448 bp. The genome contains 7,720 coding genes, 132 RNA genes, and 99 pseudo-genes.

To find the nitrate reductase genes, the genome of MAH-34T was annotated by RAST (Rapid Annotation Using Subsystem Technology). The annotated analysis shows a total of 22 nitrate and/or nitrite reductase genes. Among these 22 genes, only 4 genes have the RAST IDs (GO IDs) with one published gene [Nitrous-oxide reductase (NosZ)] as shown in Table 1. Thus, it is predicted that some of the genes may be responsible for the production of silver nanoparticles (AgNPs) via the hydrolysis of AgNO3.

The list of nitrate/nitrite reductase of MAH-34T

S.No Abbreviations Functional role GO IDs Literature
1 NorQ Nitric-oxide reductase activation protein NorQ GO:0005524, None
GO:0016887
2 NorB Nitric-oxide reductase subunit B (EC 1.7.99.7) GO:0016966 None
3 NorC Nitric-oxide reductase subunit C (EC 1.7.99.7) GO:0016966 None
4 NosZ Nitrous-oxide reductase (EC 1.7.99.6) GO:0050304 8 Publications


Data Availability

The draft genome sequence of MAH-34T has been deposited at DDBJ/EMBL/GenBank under the accession number WSEM00000000. This strain is available from the Korean Agricultural Culture Collection, South Korea with the accession number KACC 19974T and China General Microbiological Culture Collection Center with the accession number CGMCC1.16610T as well as from the host institution (Chung Ang University, Anseong-si, South Korea).

적 요

목련 나무의 근권 토양에서 박테리아 균주 MAH-34T를 분리하였다. 균주 MAH-34T는 10~37°C의 온도, R2A 고체 및 액체 배지에서 자라고 28~30°C, pH 7.0, NaCl이 없을 때 가장 잘 배양되었다. 균주 MAH-34T는 질산은(AgNO3)의 가수 분해를 통해 은 나노 입자(AgNP)를 생산하는 능력을 갖고 있었다. 이에 질산염 환원 효소 유전자에 대해 알기 위해 Paenibacillus anseongense MAH-34T의 유전체 서열 분석을 수행하였다. MAH-34T의 조립된 유전체 서열은 총 8,647,101 bp, N50 및 N75 값이 각각 553,491 및 230,930 인 42개의 스캐폴드로 구성되며, DNA G + C 함량은 46.0 mol%이었다. 또한 유전체 서열 주석은 RAST (Rapid Annotation using Subsystem Technology)를 사용하여 분석하였으며 그 결과로 AgNO3의 가수 분해를 통해 은 나노 입자(AgNPs)의 생산을 담당할 수 있는 질산염 및 또는 아질산염 환원 효소 유전자가 존재함을 보여주었다.

Acknowledgments

This study was performed with the support of the National Research Foundation (NRF) of Korea grant (Project no. NRF-2018R1C1B5041386, Recipient: Md. Amdadul Huq), funded by the Korean government, Republic of Korea. This work was also supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2019R1I1A1A0106 1945), and by Korea Research Fellowship (KRF) Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (project no. 2019 H1D3A1A02070958).

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