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Research Article | Molecular Biology and Physiology

Characterization of a Type II-A CRISPR-Cas System in Streptococcus mutans

Cas Mosterd, Sylvain Moineau
Maria L. Marco, Editor
Cas Mosterd
aDépartement de Biochimie, de Microbiologie, et de Bio-Informatique, Faculté des Sciences et de Génie, Université Laval, Québec City, Quebec, Canada
bGroupe de Recherche en Écologie Buccale, Faculté de Médecine Dentaire, Université Laval, Québec City, Quebec, Canada
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Sylvain Moineau
aDépartement de Biochimie, de Microbiologie, et de Bio-Informatique, Faculté des Sciences et de Génie, Université Laval, Québec City, Quebec, Canada
bGroupe de Recherche en Écologie Buccale, Faculté de Médecine Dentaire, Université Laval, Québec City, Quebec, Canada
cFélix d’Hérelle Reference Center for Bacterial Viruses, Faculté de Médecine Dentaire, Université Laval, Québec City, Quebec, Canada
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  • ORCID record for Sylvain Moineau
Maria L. Marco
University of California, Davis
Roles: Editor
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DOI: 10.1128/mSphere.00235-20
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  • FIG 1
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    FIG 1

    Type II-A CRISPR-Cas system of S. mutans P42S. Squences are from 5′ to 3′. The tracrRNA is in yellow, the cas genes are in blue, the leader is a black arrow, the repeats are represented as red diamonds, and the spacers are green squares.

  • FIG 2
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    FIG 2

    tracrRNA in S. mutans. (A) Comparison of predicted tracrRNA in S. mutans UA159 and P42S. Complementarity to crRNA is highlighted in green. (B) The anti-repeat region within the tracrRNA of S. mutans UA159 and P42S compared to crRNA.

  • FIG 3
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    FIG 3

    PAM downstream of protospacers.

  • FIG 4
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    FIG 4

    Percent identity between Cas9 N terminus and C terminus found in several S. mutans strains.

Tables

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  • TABLE 1

    Relative frequencies of acquired PAMs

    TABLE 1
  • TABLE 2

    Phage adsorption assay

    TABLE 2
    • ↵a n = 2.

    • ↵b NA, not applicable.

  • TABLE 3

    Plasmid interference assaysa

    TABLE 3
    • ↵a No CSP was used during this experiment.

    • ↵b n = 2.

  • TABLE 4

    Plasmid interference assays to determine the PAMa

    TABLE 4
    • ↵a The darker the boxes, the stronger the interference. CSP was used during this experiment. *, n = 2.

Supplemental Material

  • Figures
  • Tables
  • FIG S1

    Comparison of cas genes (left) and Cas proteins (right) of nine S. mutans strains. Percent identity to the sequences found in S. mutans P42S is indicated. Download FIG S1, TIF file, 0.3 MB.

    Copyright © 2020 Mosterd and Moineau.

    This content is distributed under the terms of the Creative Commons Attribution 4.0 International license.

  • TABLE S1

    List of spacers acquired by different bacteriophage insensitive mutants of S. mutans. Mismatches to the M102AD genome are shown in italics in the protospacer sequence. Spacers that are not 100% identical to M102AD are indicated by an asterisk in the spacer column. Download Table S1, DOCX file, 0.02 MB.

    Copyright © 2020 Mosterd and Moineau.

    This content is distributed under the terms of the Creative Commons Attribution 4.0 International license.

  • TABLE S2

    Construct insert sequences. Protospacer sequences with flanking PAM are in italics. Download Table S2, DOCX file, 0.02 MB.

    Copyright © 2020 Mosterd and Moineau.

    This content is distributed under the terms of the Creative Commons Attribution 4.0 International license.

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Characterization of a Type II-A CRISPR-Cas System in Streptococcus mutans
Cas Mosterd, Sylvain Moineau
mSphere Jun 2020, 5 (3) e00235-20; DOI: 10.1128/mSphere.00235-20

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Characterization of a Type II-A CRISPR-Cas System in Streptococcus mutans
Cas Mosterd, Sylvain Moineau
mSphere Jun 2020, 5 (3) e00235-20; DOI: 10.1128/mSphere.00235-20
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    • ABSTRACT
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KEYWORDS

CRISPR
CRISPR-Cas
Cas9
Streptococcus
mutans
bacteriophages
phage resistance
plasmids
spacers

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