Construction of Streptococcus pyogenes mutants by allele replacement mutagenesis
S. pyogenes secrete a large array of molecules that might contribute to resistance against antimicrobial peptides (AMPs). Some of these are anchored in the cell-wall by enzymes called sortases and others are released from the cell after secretion. One of the released proteins that have previously be...
| Main Authors: | , , |
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| Format: | Proceeding Paper |
| Language: | English |
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2010
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| Online Access: | http://irep.iium.edu.my/15867/ http://irep.iium.edu.my/15867/1/construction_of_streptococcus.pdf |
| _version_ | 1848777849170821120 |
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| author | Shahdan, Intan Azura Smith, Wendy Kehoe, Mike |
| author_facet | Shahdan, Intan Azura Smith, Wendy Kehoe, Mike |
| author_sort | Shahdan, Intan Azura |
| building | IIUM Repository |
| collection | Online Access |
| description | S. pyogenes secrete a large array of molecules that might contribute to resistance against antimicrobial peptides (AMPs). Some of these are anchored in the cell-wall by enzymes called sortases and others are released from the cell after secretion. One of the released proteins that have previously been reported to inhibit bactericidal effect of the AMPs are streptococcal inhibitor of complement (SIC). SIC has been recognised as a substantial virulence factor in the M1 GAS strain AP1, because Δsic mutant failed to colonise mouse throat (Lukomski et al., 2000). In fact, the colonisation of the SIC-negative strain was significantly impaired during the first four days of post-inoculation, showing that SIC is a crucial virulence factor during the early stages of infection by this strain (Lukomski et al., 2000). Hoe and colleagues then showed that GAS Δsic mutant was easily internalised and killed more effectively by human epithelial cells than the wild-type strain (Hoe et al., 2002). Previous studies used SIC-defective mutants which were constructed by insertion of transposon. The disadvantage of such mutagenesis is that
the GAS mutants may have retained an intact copy of the sic gene, which could express some SIC protein. Therefore, the specific objective of the project was to construct a sic deletion mutant of GAS strain SF370 by allele-replacement mutagenesis. The constructed mutant would have a genetically clearly-defined deletion mutant, that completely removed sic gene from the S. pyogenes strain SF370 chromosome, without leaving any foreign sequences (such as an inserted plasmid) behind. |
| first_indexed | 2025-11-14T14:52:31Z |
| format | Proceeding Paper |
| id | iium-15867 |
| institution | International Islamic University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T14:52:31Z |
| publishDate | 2010 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | iium-158672013-08-22T02:10:51Z http://irep.iium.edu.my/15867/ Construction of Streptococcus pyogenes mutants by allele replacement mutagenesis Shahdan, Intan Azura Smith, Wendy Kehoe, Mike Q Science (General) S. pyogenes secrete a large array of molecules that might contribute to resistance against antimicrobial peptides (AMPs). Some of these are anchored in the cell-wall by enzymes called sortases and others are released from the cell after secretion. One of the released proteins that have previously been reported to inhibit bactericidal effect of the AMPs are streptococcal inhibitor of complement (SIC). SIC has been recognised as a substantial virulence factor in the M1 GAS strain AP1, because Δsic mutant failed to colonise mouse throat (Lukomski et al., 2000). In fact, the colonisation of the SIC-negative strain was significantly impaired during the first four days of post-inoculation, showing that SIC is a crucial virulence factor during the early stages of infection by this strain (Lukomski et al., 2000). Hoe and colleagues then showed that GAS Δsic mutant was easily internalised and killed more effectively by human epithelial cells than the wild-type strain (Hoe et al., 2002). Previous studies used SIC-defective mutants which were constructed by insertion of transposon. The disadvantage of such mutagenesis is that the GAS mutants may have retained an intact copy of the sic gene, which could express some SIC protein. Therefore, the specific objective of the project was to construct a sic deletion mutant of GAS strain SF370 by allele-replacement mutagenesis. The constructed mutant would have a genetically clearly-defined deletion mutant, that completely removed sic gene from the S. pyogenes strain SF370 chromosome, without leaving any foreign sequences (such as an inserted plasmid) behind. 2010 Proceeding Paper NonPeerReviewed application/pdf en http://irep.iium.edu.my/15867/1/construction_of_streptococcus.pdf Shahdan, Intan Azura and Smith, Wendy and Kehoe, Mike (2010) Construction of Streptococcus pyogenes mutants by allele replacement mutagenesis. In: IIUM Research, Innovation & Invention Exhibition (IRIIE 2010), 26 - 27 January 2010, Kuala Lumpur. http://www.iium.edu.my/irie/10/info/Programme_Book%20Part_2.pdf |
| spellingShingle | Q Science (General) Shahdan, Intan Azura Smith, Wendy Kehoe, Mike Construction of Streptococcus pyogenes mutants by allele replacement mutagenesis |
| title | Construction of Streptococcus pyogenes mutants by allele replacement mutagenesis |
| title_full | Construction of Streptococcus pyogenes mutants by allele replacement mutagenesis |
| title_fullStr | Construction of Streptococcus pyogenes mutants by allele replacement mutagenesis |
| title_full_unstemmed | Construction of Streptococcus pyogenes mutants by allele replacement mutagenesis |
| title_short | Construction of Streptococcus pyogenes mutants by allele replacement mutagenesis |
| title_sort | construction of streptococcus pyogenes mutants by allele replacement mutagenesis |
| topic | Q Science (General) |
| url | http://irep.iium.edu.my/15867/ http://irep.iium.edu.my/15867/ http://irep.iium.edu.my/15867/1/construction_of_streptococcus.pdf |