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. 1972 Nov;112(2):784–790. doi: 10.1128/jb.112.2.784-790.1972

Importance of Facilitated Diffusion for Effective Utilization of Glycerol by Escherichia coli

D P Richey 1, E C C Lin 1
PMCID: PMC251487  PMID: 4563976

Abstract

Wild-type Escherichia coli possesses an inducible permeation system which catalyzes facilitated diffusion of glycerol into the cell. A spectrophotometric method can be used to assess the presence of this mechanism. The structural gene for the facilitator (glpF) and the structural gene for glycerol kinase (glpK) apparently belong to a single operon. The glpF+ allele permits effective glycerol utilization by the cells, and, at millimolar concentrations of glycerol, cells carrying the glpF+ allele grow much faster than glpF genotypes. Although the glycerol-scavenging power of the cell depends both on the facilitated entry of the substrate and its subsequent trapping by an adenosine triphosphate-dependent phosphorylation, the two gene products, the facilitator and kinase, function independently. Wild-type Shigella flexneri appears to be glpK+ but glpF. This organism grows slowly in media at low concentrations of glycerol. When the glpF+ and glpK+ alleles of E. coli are inserted into the S. flexneri genome by transduction, the hybrid strain grows rapidly in low glycerol medium. Vice versa, when the glpF and glpK+ alleles of S. flexneri are incorporated into E. coli, the hybrid strain grows slowly in low glycerol medium.

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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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