期刊
INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
卷 128, 期 2, 页码 212-218出版社
ELSEVIER
DOI: 10.1016/j.ijfoodmicro.2008.08.010
关键词
Endolysin; Natural antimicrobials; Biopreservation; Staphylococcus aureus
资金
- Ministry of Education of Spain [AGL2006-03659/ALI]
- FICYT (Regional Government of Asturias) [PC06-009]
- Spanish Ministry of Education Ramon y Cajal Research Programme
- Spanish Ministry of Education (13P Programme-CSIC)
The endolysin gene (lysH5) from the genome of the Staphylococcus aureus bacteriophage (Phi H5 was cloned in Escherichia coli and characterized. The lysH5 gene encoded a protein (LysH5) whose calculated molecular mass and pl were 53.7 kDa and 8.7, respectively. Comparative analysis revealed that LysH5 significantly resembled other murein hydrolases encoded by staphylococcal phages. The modular organization of LysH5 comprised three putative domains, namely, CHAP (cysteine, histidine-dependent amidohydrolase/peptidase) amiclase (L-muramoyl-L-alanine amidase), and SH3b (cell wall recognition). In turbidity reduction assays, the purified protein lysed bovine and human S. aureus, and human Staphylococcus epiden-nidis strains. Other bacteria belongingto different genera were not affected. The lytic activity was optimal at pH 7.0, 37 degrees C, and sensitive to high temperatures. The purified protein was able to kill rapidly S. aureus growing in pasteurized milk and the pathogen was not detected after 4 h of incubation at 37 degrees C. As far as we know, this is the first report to assess the antimicrobial activity of a phage endolysin which might be useful for novel biocontrol strategies in dairying. (C) 2008 Elsevier B.V. All rights reserved.
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