Bidnenko E, Mercier C, Tremblay J, Tailliez P, Kulakauskas S
Génétique Microbienne, Institut National de la Recherche Agronomique, Domaine de Vilvert, 78352 Jouy-en-Josas, France.
Appl Environ Microbiol. 1998 Aug;64(8):3059-62. doi: 10.1128/AEM.64.8.3059-3062.1998.
Fluorescent in situ hybridization (FISH) is now a widely used method for identification of bacteria at the single-cell level. With gram-positive bacteria, the thick peptidoglycan layer of a cell wall presents a barrier for entry of horseradish peroxidase (HRP)-labeled probes. Therefore, such probes do not give any signal in FISH unless cells are first treated with enzymes which hydrolyze the peptidoglycan. We explored this feature of FISH to detect cells which have undergone permeabilization due to expression of autolytic enzymes. Our results indicate that FISH performed with HRP-labeled probes provides a sensitive method to estimate the states of cell walls of individual gram-positive bacteria.
荧光原位杂交(FISH)现在是一种广泛用于在单细胞水平鉴定细菌的方法。对于革兰氏阳性菌,细胞壁厚厚的肽聚糖层对辣根过氧化物酶(HRP)标记探针的进入构成障碍。因此,除非细胞先用水解肽聚糖的酶处理,否则此类探针在FISH中不会产生任何信号。我们利用FISH的这一特性来检测因自溶酶表达而发生通透性改变的细胞。我们的结果表明,用HRP标记探针进行的FISH提供了一种敏感的方法来评估单个革兰氏阳性菌的细胞壁状态。