The PII protein in the cyanobacterium Synechococcus sp. strain PCC 7942 is modified by serine phosphorylation and signals the cellular N-status.

@article{Forchhammer1994ThePP,
  title={The PII protein in the cyanobacterium Synechococcus sp. strain PCC 7942 is modified by serine phosphorylation and signals the cellular N-status.},
  author={Karl Forchhammer and Nicole Tandeau de Marsac},
  journal={Journal of bacteriology},
  year={1994},
  volume={176 1},
  pages={84-91}
}
The glnB gene product (PII protein) from Synechococcus sp. has previously been identified among 32P-labeled proteins, and its modification state has been observed to depend on both the nitrogen source and the spectral light quality (N. F. Tsinoremas, A. M. Castets, M. A. Harrison, J. F. Allen, and N. Tandeau de Marsac, Proc. Natl. Acad. Sci. USA 88:4565-4569, 1991). As shown in this study, modification of the PII protein primarily responds to the N-status of the cell, and its light-dependent… CONTINUE READING

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