Molecular characterization of the dextran-binding lectin B gene dblB of Streptococcus criceti in Streptococcus mutans strain GS-5 with mutations in both gbpC and spaP genes
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- Tamura Haruki
- Division of Bioregulatory Pharmacology, Department of Pharmacology, Iwate Medical University
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- Yamada Arisa
- Division of Bioregulatory Pharmacology, Department of Pharmacology, Iwate Medical University
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- Kato Hirohisa
- Division of Bioregulatory Pharmacology, Department of Pharmacology, Iwate Medical University
書誌事項
- タイトル別名
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- Molecular characterization of the dextran-binding lectin B gene <i>dblB</i> of <i>Streptococcus criceti</i> in <i>Streptococcus mutans</i> strain GS-5 with mutations in both <i>gbpC</i> and <i>spaP</i> genes
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抄録
Streptococcus mutans, a cariogenic agent, has a glucan-binding protein gene, gbpC, and S. criceti possesses four gbpC homologs, including dblA and dblB, as does S. sobrinus. The S. criceti dblB gene encodes a 1,717-amino-acid protein having two repetitive alanine-rich and proline-rich regions and an LPXTG motif, which is recognized by the sortase SrtA, near the C terminus. Reverse transcription-PCR analysis indicated no cotranscription of the dblA and dblB genes of S. criceti. As we could not obtain a dblB mutant of S. criceti, the dblB gene was characterized in S. mutans strain GS-5, which has genetic mutations in both gbpC and spaP genes and shows an inability to agglutinate triggered by dextran. A dextran-induced agglutination assay showed that S. mutans cells carrying dblB agglutinated in the presence of dextran. A hydrophobicity assay showed that the cells containing dblB were hydrophobic. A biofilm formation assay showed that the dblB gene was associated with biofilm formation by cells cultivated in brain heart infusion broth supplemented with glucose and maltose, but not sucrose. Nucleotide sequence analysis of the S. criceti strains studied revealed a frameshift mutation in the srtA gene encoding sortase, but intact dblA and dblB genes were found in dextran-induced agglutination-negative strains, whereas intact dblA, dblB and srtA genes were found in dextran-induced agglutination-positive strains. These results suggest the cell-surface localization of dblA and dblB gene products by SrtA and the responsibility of dblB for dextran-induced agglutination, cell-surface hydrophobicity and biofilm formation in S. criceti.
収録刊行物
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- Genes & Genetic Systems
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Genes & Genetic Systems 89 (2), 41-50, 2014
日本遺伝学会
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詳細情報 詳細情報について
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- CRID
- 1390282680450720384
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- NII論文ID
- 130004687229
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- NII書誌ID
- AA11077421
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- COI
- 1:STN:280:DC%2BC2M7hvVWktQ%3D%3D
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- ISSN
- 18805779
- 13417568
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- NDL書誌ID
- 025732077
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- PubMed
- 25224970
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可