Permeability barrier to hydrophilic solutes in Mycobacterium chelonei.
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Journal: 1990/April - Journal of Bacteriology
ISSN: 0021-9193
PUBMED: 2307653
Abstract:
In order to define the permeability barrier to hydrophilic molecules in mycobacteria, we used as a model a smooth, beta-lactamase-producing strain of Mycobacterium chelonei. The rates of hydrolysis of eight cephalosporins by intact and sonicated cells were measured, and the permeability coefficient (P) was calculated from these rates by the method of Zimmermann and Rosselet (W. Zimmermann and A. Rosselet, Antimicrob. Agents Chemother. 12:368-372, 1977). P ranged from (0.9 +/- 0.3) x 10(-8) (benzothienylcephalosporin) to (10 +/- 3.3) x 10(-8) cm/s (cephaloridine); i.e., the P values were lower than those reported for Pseudomonas aeruginosa and Escherichia coli by 1 and 3 orders of magnitude, respectively. The permeability barrier was shown to reduce drastically the stream of drug molecules entering the cell, allowing the rather low level of beta-lactamase (0.1 U/mg of protein with penicillin G) to decrease radically the concentration of the drug at the target; this explains the poor in vitro activities of the beta-lactams against M. chelonei. We also estimated P for small, hydrophilic molecules (glucose, glycerol, glycine, leucine), by studying their uptake kinetics. The values found, ranging from 15 x 10(-8) to 490 x 10(-8) cm/s, were consistent again with a very low permeability of M. chelonei cell wall. The permeation of cephalosporins was not very dependent on the hydrophobicity of the molecules or on the temperature, suggesting a hydrophilic pathway of penetration for these molecules.
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J Bacteriol 172(3): 1418-1423
PMID: 2307653

Permeability barrier to hydrophilic solutes in Mycobacterium chelonei.

Abstract

In order to define the permeability barrier to hydrophilic molecules in mycobacteria, we used as a model a smooth, beta-lactamase-producing strain of Mycobacterium chelonei. The rates of hydrolysis of eight cephalosporins by intact and sonicated cells were measured, and the permeability coefficient (P) was calculated from these rates by the method of Zimmermann and Rosselet (W. Zimmermann and A. Rosselet, Antimicrob. Agents Chemother. 12:368-372, 1977). P ranged from (0.9 +/- 0.3) x 10(-8) (benzothienylcephalosporin) to (10 +/- 3.3) x 10(-8) cm/s (cephaloridine); i.e., the P values were lower than those reported for Pseudomonas aeruginosa and Escherichia coli by 1 and 3 orders of magnitude, respectively. The permeability barrier was shown to reduce drastically the stream of drug molecules entering the cell, allowing the rather low level of beta-lactamase (0.1 U/mg of protein with penicillin G) to decrease radically the concentration of the drug at the target; this explains the poor in vitro activities of the beta-lactams against M. chelonei. We also estimated P for small, hydrophilic molecules (glucose, glycerol, glycine, leucine), by studying their uptake kinetics. The values found, ranging from 15 x 10(-8) to 490 x 10(-8) cm/s, were consistent again with a very low permeability of M. chelonei cell wall. The permeation of cephalosporins was not very dependent on the hydrophobicity of the molecules or on the temperature, suggesting a hydrophilic pathway of penetration for these molecules.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
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Department of Molecular and Cell Biology, University of California, Berkeley 94720.
Department of Molecular and Cell Biology, University of California, Berkeley 94720.
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Abstract
In order to define the permeability barrier to hydrophilic molecules in mycobacteria, we used as a model a smooth, beta-lactamase-producing strain of Mycobacterium chelonei. The rates of hydrolysis of eight cephalosporins by intact and sonicated cells were measured, and the permeability coefficient (P) was calculated from these rates by the method of Zimmermann and Rosselet (W. Zimmermann and A. Rosselet, Antimicrob. Agents Chemother. 12:368-372, 1977). P ranged from (0.9 +/- 0.3) x 10(-8) (benzothienylcephalosporin) to (10 +/- 3.3) x 10(-8) cm/s (cephaloridine); i.e., the P values were lower than those reported for Pseudomonas aeruginosa and Escherichia coli by 1 and 3 orders of magnitude, respectively. The permeability barrier was shown to reduce drastically the stream of drug molecules entering the cell, allowing the rather low level of beta-lactamase (0.1 U/mg of protein with penicillin G) to decrease radically the concentration of the drug at the target; this explains the poor in vitro activities of the beta-lactams against M. chelonei. We also estimated P for small, hydrophilic molecules (glucose, glycerol, glycine, leucine), by studying their uptake kinetics. The values found, ranging from 15 x 10(-8) to 490 x 10(-8) cm/s, were consistent again with a very low permeability of M. chelonei cell wall. The permeation of cephalosporins was not very dependent on the hydrophobicity of the molecules or on the temperature, suggesting a hydrophilic pathway of penetration for these molecules.
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