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Article
The Acid Stress Response of the Cyanobacterium Synechocystis sp. Strain PCC 6308
2002
  • Jean J. Huang, Franklin W. Olin College of Engineering
  • Nancy H Kolodny
  • Jennifer T Redfearn
  • Mary M Allen
Document Type
Article
Publication Date
1-1-2002
Abstract
The cyanobacterium Synechocystis sp. strain PCC 6308 has been shown to exhibit predictable physiological responses to acid stress. Originally isolated from a Wisconsin lake, this cyanobacterium grows optimally under alkaline conditions in the laboratory. After acid stress at a pH of between 4.4 and 7.7, cells return to exponential growth following a lag phase. The organism's response to this tolerable acid stress involves cell concentration-dependent neutralization of the external medium to pH 6 or above within 5 min, maintenance of a transmembrane pH gradient, and maintenance of photosystem II efficiency. Lethal acid stress, at a pH below 4.4, results in the formation of aggregates of denatured proteins observed as granules near the cell periphery, the disruption of the transmembrane pH gradient, cell color change to blue, and damage to photosystem II.
Comments

© 2002 Springer-Verlag. This article was published in Archives of Microbiology, vol. 177, no. 6, p. 486-493 and may be found here.

Citation Information
Jean J. Huang, Nancy H Kolodny, Jennifer T Redfearn and Mary M Allen. "The Acid Stress Response of the Cyanobacterium Synechocystis sp. Strain PCC 6308" (2002)
Available at: http://works.bepress.com/jean_huang/21/