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PMID:17905888
| Citation |
Pritchard, DG, Dong, S, Kirk, MC, Cartee, RT and Baker, JR (2007) LambdaSa1 and LambdaSa2 prophage lysins of Streptococcus agalactiae. Appl. Environ. Microbiol. 73:7150-4 |
|---|---|
| Abstract |
Putative N-acetylmuramyl-l-alanine amidase genes from LambdaSa1 and LambdaSa2 prophages of Streptococcus agalactiae were cloned and expressed in Escherichia coli. The purified enzymes lysed the cell walls of Streptococcus agalactiae, Streptococcus pneumoniae, and Staphylococcus aureus. The peptidoglycan digestion products in the cell wall lysates were not consistent with amidase activity. Instead, the structure of the muropeptide digestion fragments indicated that both the LambdaSa1 and LambdaSa2 lysins exhibited gamma-d-glutaminyl-l-lysine endopeptidase activity. The endopeptidase cleavage specificity of the lysins was confirmed using a synthetic peptide substrate corresponding to a portion of the stem peptide and cross bridge of Streptococcus agalactiae peptidoglycan. The LambdaSa2 lysin also displayed beta-d-N-acetylglucosaminidase activity. |
| Links |
PubMed PMC2168211 Online version:10.1128/AEM.01783-07 |
| Keywords |
Bacteriolysis; Catalytic Domain; Cell Wall/metabolism; Chromatography, Liquid; Endopeptidases/metabolism; Gas Chromatography-Mass Spectrometry; Molecular Structure; N-Acetylmuramoyl-L-alanine Amidase/genetics; N-Acetylmuramoyl-L-alanine Amidase/metabolism; Peptidoglycan/chemistry; Peptidoglycan/metabolism; Prophages/genetics; Prophages/metabolism; Spectrometry, Mass, Electrospray Ionization; Staphylococcus aureus/metabolism; Streptococcus agalactiae/metabolism; Streptococcus agalactiae/virology; Streptococcus pneumoniae/metabolism; Viral Proteins/genetics; Viral Proteins/metabolism |
Significance
Annotations
| Gene product | Qualifier | GO Term | Evidence Code | with/from | Aspect | Extension | Notes | Status |
|---|---|---|---|---|---|---|---|---|
| GO:0061786: peptidoglycan stem peptide endopeptidase activity |
ECO:0000314: |
F |
Figure 2 A,B,D,E |
complete | ||||
| GO:0061784: peptidoglycan N-acetylglucosaminidase activity |
ECO:0000314: |
F |
Figure 4 shows that LambdaSa2 possesses N-acetylgucosaminidase activity and not N-acetylmuramidase activity. |
complete | ||||
| GO:0061786: peptidoglycan stem peptide endopeptidase activity |
ECO:0000314: |
F |
Figure 2C |
complete | ||||
Notes
See also
References
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