Method for the lysis of Gram-positive, asporogenous bacteria with lysozyme.

Applied and Environmental Microbiology
B M Chassy, A Giuffrida

Abstract

A method developed for the lysis of oral streptococci that employed the action of lysozyme suspended in dilute tris(hydroxymethyl)aminomethane-hydrochloride buffer containing polyethylene glycol has been adapted for use with lactobacilli, actinomycetes, propionibacteria, and pediococci. Most of the cellular deoxyribonucleic acid was liberated from many strains of bacteria usually thought to be lysozyme resistant. The major observations were as follows: (i) supplementation of the growth medium with L-threonine, L-lysine, or both frequently produced cells that were more susceptible to lysis by lysozyme; (ii) glucose-containing media produced cells that were more easily lysed than those from cultures grown on other substrates; (iii) polyethylene glycol not only served as an osmotic stabilizer, it also enhanced the extent of lysis; and (iv) dilute tris(hydroxymethyl)aminomethane buffer was superior to the buffer systems most commonly employed in published muramidase-based lysis techniques. Stationary-phase cells of Lactobacillus casei and Streptococcus mutans were more easily lysed than those isolated from log-phase cultures. The method as detailed in this report should be generally applicable for the lysis of gram-positive, asporo...Continue Reading

Citations

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