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. 1981 Apr;67(4):716–719. doi: 10.1104/pp.67.4.716

Accumulation of Cyanophycin Granules as a Result of Phosphate Limitation in Agmenellum quadruplicatum1

S Edward Stevens Jr 1,2,2, Domenic A M Paone 1,2, David L Balkwill 1,2
PMCID: PMC425760  PMID: 16661742

Abstract

Phosphate-limited growth of the blue-green alga Agmenellum quadruplicatum resulted in the accumulation of cyanophycin granule polypeptide (CGP), which is a 1:1 co-polymer of aspartic acid and arginine. The progressive accumulation of CGP began after depletion of phosphate from the medium. CGP increased in concentration much faster than the increase in cell number. Electron microscopy indicated that both the number of cyanophycin granules per cell section and the diameter of each granule increased as phosphate starvation progressed. A marked decrease in the electron density of the inter-thylakoidal areas took place concurrently with the accumulation of CGP. At the same time a progessive decrease in the pigment concentration of cells and in the rate of nitrate uptake was observed. Thirty-two hours after phosphate depletion from the medium up to 28% of total cellular nitrogen was found in CGP.

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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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