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Evidence for an efflux carrier system involved in the secretion of glutamate by Corynebacterium glutamicum

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Abstract

Corynebacterium glutamicum effectively secretes L-glutamate when growing under biotin limitation. The secretion of glutamate was studied with respect to kinetic and energetic parameters: rate of glutamate uptake and efflux, specificity of transport, dependence of efflux on the energy state of the cell, concentration gradient of glutamate and ions, and membrane potential. By comparing these parameters when measured in biotin-limited, i.e. “producer” cells, and biotin-supplemented, i.e. “non-producer” cells, respectively, the following conclusions could be drawn: 1. The efflux of L-glutamate in C. glutamicum cannot be explained by passive permeation of this amino acid through the plasma membrane, as it has been assumed in the generally accepted model of glutamate secretion in biotin-limited cells. 2. It is unlikely that the efflux of glutamate occurs via an inversion of the glutamate uptake system. 3. Based on our results concerning the specificity and the kinetics of glutamate transport as well as the observed regulation phenomena, we conclude that secretion of glutamate in C. glutamicum occurs by a special efflux carrier system.

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Abbreviations

dw:

dry weight

OD:

optical density

TPP:

tetraphenyl phosphonium bromide

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Hoischen, C., Krämer, R. Evidence for an efflux carrier system involved in the secretion of glutamate by Corynebacterium glutamicum . Arch. Microbiol. 151, 342–347 (1989). https://doi.org/10.1007/BF00406562

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