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Gene Rearrangement and Modification of Immunity Factors Are Correlated with the Insertion of Bacteriocin Cassettes in Streptococcus mutans. Microbiol Spectr 2022; 10:e0180621. [PMID: 35604175 PMCID: PMC9241761 DOI: 10.1128/spectrum.01806-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Bacteriocins have been applied in the food industries and have become promising next-generation antibiotics. Some bacteria produce bacteriocins and possess immunity factors for self-protection. Nisin A, a bacteriocin produced by Lactococcus lactis, shows broad-spectrum activity. However, the evolution and cross-resistance ability of the immunity factors in some species results in reduced susceptibility to bacteriocins. Here, we investigated the elements responsible for nisin A resistance in Streptococcus mutans and their contribution to mutacins (bacteriocins produced by S. mutans) resistance. We classified the nisin A-resistance regions into six types based on the different combinations of 3 immunity factors, mutFEG, nsrX, and mutHIJ, and the presence of mutacin synthesis operon upstream of mutF. Data shows that NsrX effectively acts against nisin A but not mutacins, while the newly identified ABC transporter MutHIJ acts against three mutacins but not nisin A. Three types of MutFEG are identified based on their amino acid sequences: α (in Nsr-types C and D-I), β (in Nsr-types B and d-III), and γ (in Nsr-type E). MutFEG-α strongly contributes to mutacin I resistance, while MutFEG-β and MutFEG-γ strongly contribute to mutacin III, IIIb, and nisin A resistance. Additionally, mutFEG-like structures could be found in various streptococcal species isolated from the oral cavity of humans, chimpanzees, monkeys, bears, and hamsters. Our findings suggest that immunity factors rearrange and adapt in the presence of bacteriocins and could be transferred among closely related species, thus altering the bacterial competition within the microflora. IMPORTANCEStreptococcus mutans is an important organism of oral microbiota and associated with dental caries and systemic diseases such as stroke and endocarditis. They produce bacteriocins known as mutacins to compete with other oral bacteria and possess immune factors for self-protection. We found that the nisin A and mutacins resistance patterns correlated with the immunity components and MutFEG variants, and the genetic difference was driven by the insertion of mutacin-synthesis cassettes. Our study provides an understanding of the development of bacteriocin resistance among streptococcal species, which may alter the bacterial interaction and ecology within the oral biofilm.
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2
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Xu RR, Yang WD, Niu KX, Wang B, Wang WM. An Update on the Evolution of Glucosyltransferase ( Gtf) Genes in Streptococcus. Front Microbiol 2018; 9:2979. [PMID: 30568640 PMCID: PMC6290343 DOI: 10.3389/fmicb.2018.02979] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Accepted: 11/19/2018] [Indexed: 11/13/2022] Open
Abstract
In many caries-promoting Streptococcus species, glucosyltransferases (Gtfs) are recognized as key enzymes contributing to the modification of biofilm structures, disruption of homeostasis of healthy microbiota community and induction of caries development. It is therefore of great interest to investigate how Gtf genes have evolved in Streptococcus. In this study, we conducted a comprehensive survey of Gtf genes among 872 streptococci genomes of 37 species and identified Gtf genes from 364 genomes of 18 species. To clarify the relationships of these Gtf genes, 45 representative sequences were used for phylogenic analysis, which revealed two clear clades. Clade I included 12 Gtf genes from nine caries-promoting species of the Mutans and Downei groups, which produce enzymes known to synthesize sticky, water-insoluble glucans (WIG) that are critical for modifying biofilm structures. Clade II primarily contained Gtf genes responsible for synthesizing water-soluble glucans (WSG) from all 18 species, and this clade further diverged into three subclades (IIA, IIB, and IIC). An analysis of 16 pairs of duplicated Gtf genes revealed high divergence levels at the C-terminal repeat regions, with ratios of the non-synonymous substitution rate (dN) to synonymous substitution rate (dS) ranging from 0.60 to 1.03, indicating an overall relaxed constraint in this region. However, among the clade I Gtf genes, some individual repeat units possessed strong functional constraints by the same criterion. Structural variations in the repeat regions were also observed, with detection of deletions or recent duplications of individual repeat units. Overall, by establishing an updated phylogeny and further elucidating their evolutionary patterns, this work enabled us to gain a greater understanding of the origination and divergence of Gtf genes in Streptococcus.
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Affiliation(s)
- Rong-Rong Xu
- Nanjing Stomatological Hospital, Nanjing University Medical School, Nanjing, China
| | - Wei-Dong Yang
- Nanjing Stomatological Hospital, Nanjing University Medical School, Nanjing, China
| | - Ke-Xin Niu
- Laboratory of Plant Genetics and Molecular Evolution, School of Life Sciences, Nanjing University, Nanjing, China
| | - Bin Wang
- Laboratory of Plant Genetics and Molecular Evolution, School of Life Sciences, Nanjing University, Nanjing, China
| | - Wen-Mei Wang
- Nanjing Stomatological Hospital, Nanjing University Medical School, Nanjing, China
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3
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Kaspar J, Shields RC, Burne RA. Competence inhibition by the XrpA peptide encoded within the comX gene of Streptococcus mutans. Mol Microbiol 2018; 109:345-364. [PMID: 29802741 DOI: 10.1111/mmi.13989] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/16/2018] [Indexed: 01/06/2023]
Abstract
Streptococcus mutans displays complex regulation of natural genetic competence. Competence development in S. mutans is controlled by a peptide derived from ComS (XIP); which along with the cytosolic regulator ComR controls the expression of the alternative sigma factor comX, the master regulator of competence development. Recently, a gene embedded within the coding region of comX was discovered and designated xrpA (comX regulatory peptide A). XrpA was found to be an antagonist of ComX, but the mechanism was not established. In this study, we reveal through both genomic and proteomic techniques that XrpA is the first described negative regulator of ComRS systems in streptococci. Transcriptomic and promoter activity assays in the ΔxrpA strain revealed an up-regulation of genes controlled by both the ComR- and ComX-regulons. An in vivo protein crosslinking and in vitro fluorescent polarization assays confirmed that the N-terminal region of XrpA were found to be sufficient in inhibiting ComR-XIP complex binding to ECom-box located within the comX promoter. This inhibitory activity was sufficient for decreases in PcomX activity, transformability and ComX accumulation. XrpA serving as a modulator of ComRS activity ultimately results in changes to subpopulation behaviors and cell fate during competence activation.
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Affiliation(s)
- Justin Kaspar
- Department of Oral Biology, University of Florida, Gainesville, FL, 32610, USA
| | - Robert C Shields
- Department of Oral Biology, University of Florida, Gainesville, FL, 32610, USA
| | - Robert A Burne
- Department of Oral Biology, University of Florida, Gainesville, FL, 32610, USA
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4
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Okamoto M, Naito M, Miyanohara M, Imai S, Nomura Y, Saito W, Momoi Y, Takada K, Miyabe-Nishiwaki T, Tomonaga M, Hanada N. Complete genome sequence of Streptococcus troglodytae TKU31 isolated from the oral cavity of a chimpanzee (Pan troglodytes). Microbiol Immunol 2017; 60:811-816. [PMID: 27921343 DOI: 10.1111/1348-0421.12453] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Revised: 11/21/2016] [Accepted: 11/24/2016] [Indexed: 11/27/2022]
Abstract
Streptococcus troglodytae TKU31 was isolated from the oral cavity of a chimpanzee (Pan troglodytes) and was found to be the most closely related species of the mutans group streptococci to Streptococcus mutans. The complete sequence of TKU31 genome consists of a single circular chromosome that is 2,097,874 base pairs long and has a G + C content of 37.18%. It possesses 2082 coding sequences (CDSs), 65 tRNAs and five rRNA operons (15 rRNAs). Two clustered regularly interspaced short palindromic repeats, six insertion sequences and two predicted prophage elements were identified. The genome of TKU31 harbors some putative virulence associated genes, including gtfB, gtfC and gtfD genes encoding glucosyltransferase and gbpA, gbpB, gbpC and gbpD genes encoding glucan-binding cell wall-anchored protein. The deduced amino acid identity of the rhamnose-glucose polysaccharide F gene (rgpF), which is one of the serotype determinants, is 91% identical with that of S. mutans LJ23 (serotype k) strain. However, two other virulence-associated genes cnm and cbm, which encode the collagen-binding proteins, were not found in the TKU31 genome. The complete genome sequence of S. troglodytae TKU31 has been deposited at DDBJ/European Nucleotide Archive/GenBank under the accession no. AP014612.
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Affiliation(s)
- Masaaki Okamoto
- Department of Translational Research, Tsurumi University School of Dental Medicine
| | - Mariko Naito
- Division of Microbiology and Oral Infection, Department of Molecular Microbiology and Immunology, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki 852-8588
| | - Mayu Miyanohara
- Department of Translational Research, Tsurumi University School of Dental Medicine
| | - Susumu Imai
- Department of Translational Research, Tsurumi University School of Dental Medicine
| | - Yoshiaki Nomura
- Department of Translational Research, Tsurumi University School of Dental Medicine
| | - Wataru Saito
- Department of Operative Dentistry, 2-1-3, Tsurumi, Tsurumi-ku, Yokohama 230-8501
| | - Yasuko Momoi
- Department of Operative Dentistry, 2-1-3, Tsurumi, Tsurumi-ku, Yokohama 230-8501
| | - Kazuko Takada
- Department of Oral Microbiology, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo, Chiba, 271-8587
| | | | - Masaki Tomonaga
- Language and Intelligence Section, Primate Research Institute, Kyoto University, Inuyama, Aichi 484-8506, Japan
| | - Nobuhiro Hanada
- Department of Translational Research, Tsurumi University School of Dental Medicine
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5
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Tammaro P, Richard N, Andre B, Andremont A, Mammeri H. First report of human infection due to Streptococcus devriesei. New Microbes New Infect 2016; 15:72-73. [PMID: 28053705 PMCID: PMC5198732 DOI: 10.1016/j.nmni.2016.11.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Revised: 11/03/2016] [Accepted: 11/09/2016] [Indexed: 11/30/2022] Open
Abstract
So far, Streptococcus devriesei, which belongs to the mutans streptococci group, has been incriminated in the formation of caries in Equidae. We report the first human infection due to this species in a 54-year-old man with gangrenous cholecystitis. The patient was treated successfully by cholecystectomy and ceftriaxone.
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Affiliation(s)
- P Tammaro
- Service de Chirurgie digestive, APHP, Hôpital Bichat Claude Bernard, Paris, France
| | - N Richard
- Laboratoire de Bactériologie, APHP, Hôpital Bichat Claude Bernard, Paris, France
| | - B Andre
- Laboratoire de Bactériologie, APHP, Hôpital Bichat Claude Bernard, Paris, France
| | - A Andremont
- Laboratoire de Bactériologie, APHP, Hôpital Bichat Claude Bernard, Paris, France; INSERM, IAME, UMR 1137, Sorbonne Paris Cité, Paris, France; Université Paris Diderot, IAME, UMR 1137, Sorbonne Paris Cité, Paris, France
| | - H Mammeri
- Laboratoire de Bactériologie, APHP, Hôpital Bichat Claude Bernard, Paris, France; INSERM, IAME, UMR 1137, Sorbonne Paris Cité, Paris, France; Université Paris Diderot, IAME, UMR 1137, Sorbonne Paris Cité, Paris, France
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6
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Streptococcus dentiloxodontae sp. nov., isolated from the oral cavity of elephants. Int J Syst Evol Microbiol 2016; 66:3878-3883. [DOI: 10.1099/ijsem.0.001280] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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7
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Bai X, Xiong Y, Lu S, Jin D, Lai X, Yang J, Niu L, Hu S, Meng X, Pu J, Ye C, Xu J. Streptococcuspantholopis sp. nov., isolated from faeces of the Tibetan antelope (Pantholops hodgsonii). Int J Syst Evol Microbiol 2016; 66:3281-3286. [PMID: 27226124 DOI: 10.1099/ijsem.0.001189] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Two bacterial strains were isolated from faecal samples of Tibetan antelopes. The isolates were Gram-stain-positive, catalase-negative, coccus-shaped organisms that were tentatively identified as representing a novel streptococcal species based on their morphological features, biochemical test results and phylogenomic findings. Comparative 16S rRNA gene sequencing studies confirmed that the organisms were members of the genus Streptococcus, but they did not correspond to any recognized species of the genus. The nearest phylogenetic relative of the unknown coccus was Streptococcus ursoris NUM 1615T (93.4 % 16S rRNA gene sequence similarity). Analysis of groEL and rpoB gene sequences of the novel isolates showed interspecies divergence of 27.0 and 22.2 %, respectively, from the type strain of its closest 16S rRNA gene phylogenetic relative, S. ursoris. The complete genome of strain TA 26T has been sequenced. Digital DNA-DNA hybridization studies between strain TA 26T and other species of the genus Streptococcus deposited in the GenBank database showed less than 70 % DNA-DNA relatedness, supporting a novel species status of the strain. On the basis of their genotypic and phenotypic differences from recognized Streptococcus species, the two isolates represent a novel species of the genus Streptococcus, for which the nameStreptococcus pantholopis sp. nov. (type strain TA 26T=CGMCC 1.15667T=DSM 102135T) is proposed.
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Affiliation(s)
- Xiangning Bai
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, China CDC, Beijing, PR China
| | - Yanwen Xiong
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, China CDC, Beijing, PR China
| | - Shan Lu
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, China CDC, Beijing, PR China
| | - Dong Jin
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, China CDC, Beijing, PR China
| | - Xinhe Lai
- Institute of Translational Medicine, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, PR China.,Institute of Inflammation and Diseases, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, PR China
| | - Jing Yang
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, China CDC, Beijing, PR China
| | - Lina Niu
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, China CDC, Beijing, PR China.,School of Tropical and Laboratory Medicine, Hainan Medical University, Haikou, PR China
| | - Shoukui Hu
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, China CDC, Beijing, PR China
| | - Xiangli Meng
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, China CDC, Beijing, PR China
| | - Ji Pu
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, China CDC, Beijing, PR China
| | - Changyun Ye
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, China CDC, Beijing, PR China
| | - Jianguo Xu
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, China CDC, Beijing, PR China
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8
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Streptococcus oricebi sp. nov., isolated from the oral cavity of tufted capuchin. Int J Syst Evol Microbiol 2016; 66:1063-1067. [DOI: 10.1099/ijsem.0.000834] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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9
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Okamoto M, Imai S, Miyanohara M, Saito W, Momoi Y, Nomura Y, Ikawa T, Ogawa T, Miyabe-Nishiwaki T, Kaneko A, Watanabe A, Watanabe S, Hayashi M, Tomonaga M, Hanada N. Streptococcus panodentissp. nov. from the oral cavities of chimpanzees. Microbiol Immunol 2015; 59:526-32. [DOI: 10.1111/1348-0421.12290] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Revised: 07/15/2015] [Accepted: 07/29/2015] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | | | | | | | - Tomoko Ikawa
- Department of Fixed Prosthodontics; Tsurumi University School of Dental Medicine, 2-1-3, Tsurumi; Tsurumi-ku Yokohama 230-8501
| | - Takumi Ogawa
- Department of Fixed Prosthodontics; Tsurumi University School of Dental Medicine, 2-1-3, Tsurumi; Tsurumi-ku Yokohama 230-8501
| | | | | | | | | | - Misato Hayashi
- Language and Intelligence Section; Primate Research Institute, Kyoto University; Inuyama Aichi 484-8506, Japan
| | - Masaki Tomonaga
- Language and Intelligence Section; Primate Research Institute, Kyoto University; Inuyama Aichi 484-8506, Japan
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10
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Shinozaki-Kuwahara N, Saito M, Hirasawa M, Takada K. Streptococcus
oriloxodontae sp. nov., isolated from the oral cavities of elephants. Int J Syst Evol Microbiol 2014; 64:3755-3759. [DOI: 10.1099/ijs.0.064048-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Two strains were isolated from oral cavity samples of healthy elephants. The isolates were Gram-positive, catalase-negative, coccus-shaped organisms that were tentatively identified as a streptococcal species based on the results of biochemical tests. Comparative 16S rRNA gene sequence analysis suggested classification of these organisms in the genus
Streptococcus
with
Streptococcus criceti
ATCC 19642T and
Streptococcus orisuis
NUM 1001T as their closest phylogenetic neighbours with 98.2 and 96.9 % gene sequence similarity, respectively. When multi-locus sequence analysis using four housekeeping genes, groEL, rpoB, gyrB and sodA, was carried out, similarity of concatenated sequences of the four housekeeping genes from the new isolates and
Streptococcus mutans
was 89.7 %. DNA–DNA hybridization experiments suggested that the new isolates were distinct from
S. criceti
and other species of the genus
Streptococcus
. On the basis of genotypic and phenotypic differences, it is proposed that the novel isolates are classified in the genus
Streptococcus
as representatives of Streptococcus oriloxodontae sp. nov. The type strain of S. oriloxodontae is NUM 2101T ( = JCM 19285T = DSM 27377T).
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Affiliation(s)
- Noriko Shinozaki-Kuwahara
- Department of Oral Microbiology, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271-8587, Japan
| | - Masanori Saito
- Department of Oral Microbiology, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271-8587, Japan
| | - Masatomo Hirasawa
- Department of Oral Microbiology, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271-8587, Japan
| | - Kazuko Takada
- Department of Oral Microbiology, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271-8587, Japan
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11
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Miyanohara M, Imai S, Okamoto M, Saito W, Nomura Y, Momoi Y, Tomonaga M, Hanada N. Distribution of Streptococcus troglodytae and Streptococcus dentirousetti in chimpanzee oral cavities. Microbiol Immunol 2013; 57:359-65. [PMID: 23668608 DOI: 10.1111/1348-0421.12047] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2013] [Revised: 03/13/2013] [Accepted: 03/18/2013] [Indexed: 11/29/2022]
Abstract
The aim of this study was to analyze the distribution and phenotypic properties of the indigenous streptococci in chimpanzee (Pan troglodytes) oral cavities. Eleven chimpanzees (aged from 9 to 44 years, mean ± SD, 26.9 ± 12.6 years) in the Primate Research Institute of Kyoto University were enrolled in this research and brushing bacterial samples collected from them. Streptococci were isolated from the oral cavities of all chimpanzees. The isolates (n = 46) were identified as thirteen species by 16S rRNA genes analysis. The predominant species was Streptococcus sanguinis of mitis streptococci from five chimpanzees (45%). Mutans streptococci were isolated from six chimpanzees (55%). The predominant species in the mutans streptococci were Streptococcus troglodytae from four chimpanzees (36%), this species having been proposed as a novel species by us, and Streptococcus dentirousetti from three chimpanzees (27%). Streptococcus mutans was isolated from one chimpanzee (9%). However, Streptococcus sobrinus, Streptococcus macacae and Streptococcus downei, which are indigenous to human and monkey (Macaca fasciclaris) oral habitats, were not isolated. Of the mutans streptococci, S. troglodytae, S. dentirousetti, and S. mutans possessed strong adherence activity to glass surface.
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Affiliation(s)
- Mayu Miyanohara
- Department of Translational Research, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama 230-8501, Japan
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12
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Takada K, Saito M, Tsudukibashi O, Hiroi T, Hirasawa M. Streptococcus
orisasini sp. nov. and
Streptococcus
dentasini sp. nov., isolated from the oral cavity of donkeys. Int J Syst Evol Microbiol 2013; 63:2782-2786. [DOI: 10.1099/ijs.0.047142-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Four Gram-positive, catalase-negative, coccoid isolates that were obtained from donkey oral cavities formed two distinct clonal groups when characterized by phenotypic and phylogenetic studies. From the results of biochemical tests, the organisms were tentatively identified as a streptococcal species. Comparative 16S rRNA gene sequencing studies confirmed the organisms to be members of the genus
Streptococcus
. Two of the isolates were related most closely to
Streptococcus ursoris
with 95.6 % similarity based on the 16S rRNA gene and to
Streptococcus ratti
with 92.0 % similarity based on the 60 kDa heat-shock protein gene (groEL). The other two isolates, however, were related to
Streptococcus criceti
with 95.0 and 89.0 % similarities based on the 16S rRNA and groEL genes, respectively. From both phylogenetic and phenotypic evidence, the four isolates formed two distinct clonal groups and are suggested to represent novel species of the genus
Streptococcus
. The names proposed for these organisms are
Streptococcus
orisasini sp. nov. (type strain NUM 1801T = JCM 17942T = DSM 25193T) and
Streptococcus
dentasini sp. nov. (type strain NUM 1808T = JCM 17943T = DSM 25137T).
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Affiliation(s)
- Kazuko Takada
- Department of Oral Microbiology, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271-8587, Japan
| | - Masanori Saito
- Department of Oral Microbiology, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271-8587, Japan
| | - Osamu Tsudukibashi
- Laboratory Medicine for Dentistry, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271-8587, Japan
| | - Takachika Hiroi
- Department of Genome Medicine, Allergy and Immunology Project, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo 156-8506, Japan
| | - Masatomo Hirasawa
- Department of Oral Microbiology, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271-8587, Japan
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Phylogenetic analysis of glucosyltransferases and implications for the coevolution of mutans streptococci with their mammalian hosts. PLoS One 2013; 8:e56305. [PMID: 23457545 PMCID: PMC3572963 DOI: 10.1371/journal.pone.0056305] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Accepted: 01/08/2013] [Indexed: 11/19/2022] Open
Abstract
Glucosyltransferases (Gtfs) catalyze the synthesis of glucans from sucrose and are produced by several species of lactic-acid bacteria. The oral bacterium Streptococcus mutans produces large amounts of glucans through the action of three Gtfs. GtfD produces water-soluble glucan (WSG), GtfB synthesizes water-insoluble glucans (WIG) and GtfC produces mainly WIG but also WSG. These enzymes, especially those synthesizing WIG, are of particular interest because of their role in the formation of dental plaque, an environment where S. mutans can thrive and produce lactic acid, promoting the formation of dental caries. We sequenced the gtfB, gtfC and gtfD genes from several mutans streptococcal strains isolated from the oral cavity of humans and searched for their homologues in strains isolated from chimpanzees and macaque monkeys. The sequence data were analyzed in conjunction with the available Gtf sequences from other bacteria in the genera Streptococcus, Lactobacillus and Leuconostoc to gain insights into the evolutionary history of this family of enzymes, with a particular emphasis on S. mutans Gtfs. Our analyses indicate that streptococcal Gtfs arose from a common ancestral progenitor gene, and that they expanded to form two clades according to the type of glucan they synthesize. We also show that the clade of streptococcal Gtfs synthesizing WIG appeared shortly after the divergence of viviparous, dentate mammals, which potentially contributed to the formation of dental plaque and the establishment of several streptococci in the oral cavity. The two S. mutans Gtfs capable of WIG synthesis, GtfB and GtfC, are likely the product of a gene duplication event. We dated this event to coincide with the divergence of the genomes of ancestral early primates. Thus, the acquisition and diversification of S. mutans Gtfs predates modern humans and is unrelated to the increase in dietary sucrose consumption.
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