Forchhammer, K., and Tandeau de Marsac, N. 1995. Functional analysis of the phosphoprotein PII (glnB gene product) in the cyanobacterium Synechococcus sp. strain PCC 7942. J. Bacteriol. 177:2033-2040
Forchhammer, K., and Tandeau de Marsac, N. 1995. Phosphorylation of the PII protein (glnB gene product) in the cyanobacterium Synechococcus sp.strain PCC 7942: Analysis of in vitro kinase activity J. Bacteriol. 177: 5812-5817
de Zamaroczy, M., Paquelin, A., Peltre, G., Forchhammer, K., and Elmerich, C.1996. Coexistence of two structurally similar but functionally different PII proteins in Azospirillum brasiliense. J. Bacteriol. 178: 4143-4149
Forchhammer, K. and Hedler, A. 1997. Phosphoprotein PII from Cyanobacteria: Functional homology to the PII signal transduction protein from Escherichia coli . Eur. J. Biochem. 244: 869- 875
Irmler, A., Sanner, S., Dierks, H. and Forchhammer, K. 1997. Dephosphorylation of the phosphoprotein PII in Synechococcus PCC 7942: Identification of an ATP and 2-oxoglutarate- regulated phosphatase activity. Mol. Microbiol. 26: 81-90
Hanson, T.H., Forchhammer, K., Tandeau de Marsac, N. and Meeks, J.C. 1998. Characterization of the glnB gene product of Nostoc punctiforme strain ATCC 29133: The PII protein may be essential. Microbiology 144: 1537-1547
Görl, M., Sauer, J., Baier, T. and Forchhammer, K. 1998. Nitrogen starvation induced chlorosis in Synechococcus PCC 7942: Adaptation to long-term survival. Microbiology 144: 2449-2458.
Forchhammer, K. 1998. Protein-(Ser/Thr)-Phosphorylierung in Bakterien: Fragmente des "eukaryotischen" Typs der Signaltransduktion? Biospektrum 4, Nr. 3: 38-40
Forchhammer, K. 1999. The PII protein in Synechococcus sp. PCC 7942 senses and signals 2-oxoglutarate under ATP replete conditions. in : The Phototrophic Prokaryotes (Hrsg: G. Peschek, W. Löffelhardt und G. Schmetterer) p. 549-553
Forchhammer, K., Hedler, A., Strobel, H. and Weiss, V. 1999. Heterotrimerization of PII-like signalling proteins: implications for PII-mediated signal transduction systems. Mol. Microbiol 33: 338-349
Sauer, J., Görl, M. and Forchhammer, K. 1999. Nitrogen starvation in Synechococcus PCC 7942: Involvement of glutamine synthetase and NtcA in phycobiliprotein degradation and survival. Arch. Microbiol. 172: 247-255
Lee, H-M., Flores, E., Forchhammer, K., Herrero, A. and Tandeau de Marsac, N. 2000. Phosphorylation of the signal transducer PII protein and an additional effector are required for the PII-mediated regulation of nitrate and nitrite uptake in the cyanobacterium Synechococcus sp. PCC 7942. Eur. J. Biochem. 267: 591-600
Forchhammer, K. 2000. Heterotrimerization of PII-like signalling proteins: lessons from a comparative analysis between a cyanobacterial PII homologue and its proteobacterial counterparts. Nitrogen Fixation: From Molecules to Crop Productivity p. 103- 104 (Hrsg: F.O. Pedroso, et al..), Kluwer Academic Publishers, Dordrcht, NL
Huckauf, J., Nomura, C., Forchhammer,, K. and Hagemann, M. 2000. Stress responses of Synechocystis sp. strain PCC 6803 mutants impaired in genes encoding putative alternative sigma factors. Microbiology 146: 2877-2889
Sauer, J., Dirmeier, U. und Forchhammer, K. 2000. The Synechococcus PCC 7942 glnN product (glutamine synthetase III) helps recovery from prolonged nitrogen chlorosis. J. Bacteriol 182: 5615-5619
Sauer, J., Schreiber, U., Schmid, R., Völker, U. und Forchhammer, K. 2001. Nitrogen-starvation induced chlorosis in Synechococcus PCC 7942: low-level photosynthesis as a mechanism of long-term survival. Plant Physiol. 126: 233-243
Forchhammer, K. 2001. Nitrogen-starvation in non-diazotrophic cyanobacteria: survival through chlorosis. Recent Res. Devel. Microbiol. 6: 45-54
Irmler, A. und Forchhammer, K. 2001. A PP2C-type phosphatase dephosphorylates the PII signaling protein in the cyanobacterium Synechocystis PCC 6803 Proc. Natl. Acad. Sci. USA 98: 12978-12983
Ruppert, U., Irmler, A., Kloft, N. und Forchhammer, K. 2002.The novel protein phosphatase PphA from Syenchocystis PCC6803 controls dephosphorylation of the signaling protein PII. Mol. Microbiol. 44: 855-864
Aldehni, M.F., Sauer, J., Spielhaupter, C., Schmid, R. und Forchhammer, K. 2003. The signal transduction protein PII is required for NtcA-regulated gene expression during nitrogen deprivation in the cyanobacteium Synechococcus elongatus strain PCC 7942. J. Bacteriol. (in press)
Forchhammer, K. 2003. PII signal transduction in Cyanobacteria. Symbiosis (in press)
Maheswaran, M. und Forchhammer, K. 2003. Carbon-source dependent nitrogen regualtion in Escherichia coli is mediated through glutamine dependent GlnB-signalling (submitted)