A Survey of Chloroplast Protein Kinases and Phosphatases in Arabidopsis thaliana
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A Survey of Chloroplast Protein Kinases and Phosphatases in Arabidopsis thaliana. / Schliebner, I; Pribil, M; Zühlke, J; Dietzmann, A; Leister, D.
In: Current Genomics, Vol. 9, No. 3, 2008, p. 184-90.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - A Survey of Chloroplast Protein Kinases and Phosphatases in Arabidopsis thaliana
AU - Schliebner, I
AU - Pribil, M
AU - Zühlke, J
AU - Dietzmann, A
AU - Leister, D
PY - 2008
Y1 - 2008
N2 - Protein phosphorylation is a major mode of regulation of metabolism, gene expression and cell architecture. In chloroplasts, reversible phosphorylation of proteins is known to regulate a number of prominent processes, for instance photosynthesis, gene expression and starch metabolism. The complements of the involved chloroplast protein kinases (cpPKs) and phosphatases (cpPPs) are largely unknown, except 6 proteins (4 cpPKs and 2 cpPPs) which have been experimentally identified so far. We employed combinations of programs predicting N-terminal chloroplast transit peptides (cTPs) to identify 45 tentative cpPKs and 21 tentative cpPPs. However, test sets of 9 tentative cpPKs and 13 tentative cpPPs contain only 2 and 7 genuine cpPKs and cpPPs, respectively, based on experimental subcellular localization of their N-termini fused to the reporter protein RFP. Taken together, the set of enzymes known to be involved in the reversible phosphorylation of chloroplast proteins in A. thaliana comprises altogether now 6 cpPKs and 9 cpPPs, the function of which needs to be determined in future by functional genomics approaches. This includes the calcium-regulated PK CIPK13 which we found to be located in the chloroplast, indicating that calcium-dependent signal transduction pathways also operate in this organelle.
AB - Protein phosphorylation is a major mode of regulation of metabolism, gene expression and cell architecture. In chloroplasts, reversible phosphorylation of proteins is known to regulate a number of prominent processes, for instance photosynthesis, gene expression and starch metabolism. The complements of the involved chloroplast protein kinases (cpPKs) and phosphatases (cpPPs) are largely unknown, except 6 proteins (4 cpPKs and 2 cpPPs) which have been experimentally identified so far. We employed combinations of programs predicting N-terminal chloroplast transit peptides (cTPs) to identify 45 tentative cpPKs and 21 tentative cpPPs. However, test sets of 9 tentative cpPKs and 13 tentative cpPPs contain only 2 and 7 genuine cpPKs and cpPPs, respectively, based on experimental subcellular localization of their N-termini fused to the reporter protein RFP. Taken together, the set of enzymes known to be involved in the reversible phosphorylation of chloroplast proteins in A. thaliana comprises altogether now 6 cpPKs and 9 cpPPs, the function of which needs to be determined in future by functional genomics approaches. This includes the calcium-regulated PK CIPK13 which we found to be located in the chloroplast, indicating that calcium-dependent signal transduction pathways also operate in this organelle.
KW - Journal Article
U2 - 10.2174/138920208784340740
DO - 10.2174/138920208784340740
M3 - Journal article
C2 - 19440515
VL - 9
SP - 184
EP - 190
JO - Current Genomics
JF - Current Genomics
SN - 1389-2029
IS - 3
ER -
ID: 174440557