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    Resistance of rumen bacteria murein to bovine gastric lysozyme

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    Resistance of rumen bacteria ...
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    Genre
    Journal Article
    Date
    2004-05-11
    Author
    Domínguez-Bello, MG
    Pacheco, MA
    Ruiz, MC
    Michelangeli, F
    Leippe, M
    De Pedro, MA
    Subject
    Abomasum
    Animals
    Cattle
    Electrophoresis, Polyacrylamide Gel
    Escherichia coli
    Gastric Mucosa
    Hydrogen-Ion Concentration
    Lactobacillus
    Micrococcus luteus
    Muramidase
    Peptidoglycan
    Pseudomonas aeruginosa
    Rumen
    Streptococcus bovis
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    Permanent link to this record
    http://hdl.handle.net/20.500.12613/5659
    
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    DOI
    10.1186/1472-6785-4-7
    Abstract
    Background- Lysozymes, enzymes mostly associated with defence against bacterial infections, are mureinolytic. Ruminants have evolved a gastric c type lysozyme as a digestive enzyme, and profit from digestion of foregut bacteria, after most dietary components, including protein, have been fermented in the rumen. In this work we characterized the biological activities of bovine gastric secretions against membranes, purified murein and bacteria. Results- Bovine gastric extract (BGE) was active against both G+ and G- bacteria, but the effect against Gram- bacteria was not due to the lysozyme, since purified BGL had only activity against Gram+ bacteria. We were unable to find small pore forming peptides in the BGE, and found that the inhibition of Gram negative bacteria by BGE was due to an artefact caused by acetate. We report for first time the activity of bovine gastric lysozyme (BG lysozyme) against pure bacterial cultures, and the specific resistance of some rumen Gram positive strain to BGL. Conclusions- Some Gram+ rumen bacteria showed resistance to abomasum lysozyme. We discuss the implications of this finding in the light of possible practical applications of such a stable antimicrobial peptide.
    Citation to related work
    Springer Science and Business Media LLC
    Has part
    BMC Ecology
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    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/5641
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