Abstract
Several calcium-dependent protein kinases (CDPKs) are located in plant plasma membranes where they phosphorylate enzymes and transporters, like the H+-ATPase and water channels, thereby regulating their activities. In order to determine which kinases phosphorylate the H+-ATPase, a calcium-dependent kinase was purified from beetroot (Beta vulgaris L.) plasma membranes by anion-exchange chromatography, centrifugation in glycerol gradients and hydrophobic interaction chromatography. The kinetic parameters of this kinase were determined (V max: 3.5 μmol mg−1 min−1, K m for ATP: 67 μM, K m for syntide 2: 15 μM). The kinase showed an optimum pH of 6.8 and a marked dependence on low-micromolar Ca2+ concentrations (K d : 0.77 μM). During the purification procedure, a 63-kDa protein with an isoelectric point of 4.7 was enriched. However, this protein was shown not to be a kinase by mass spectrometry. Kinase activity gels showed that a 50-kDa protein could be responsible for most of the activity in purified kinase preparations. This protein was confirmed to be a CDPK by mass spectrometry, possibly the red beet ortholog of rice CDPK2 and Arabidopsis thaliana CPK9, both found associated with membranes. This kinase was able to phosphorylate purified H+-ATPase in a Ca2+-dependent manner.
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Abbreviations
- CDPK:
-
Calcium-dependent protein kinase
- CID:
-
Collision-induced dissociation
- ESI:
-
Electrospray ionization
- GFP:
-
Green fluorescent protein
- HEDTA:
-
N-hydroxyethylethylenediamine-triacetic acid
- K d :
-
Dissociation constant
- MALDI-ToF:
-
Matrix-assisted laser desorption ionization-time of flight
- MBP:
-
Myelin basic protein
- MS:
-
Mass spectrometry
- PDI:
-
Protein disulfide isomerase
- PMF:
-
Peptide-mass fingerprinting
- PMSF:
-
Phenylmethylsulfonyl fluoride
- Q-ToF:
-
Quadrupole-time of flight
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Acknowledgments
We thank Dr. Gregory W. Kilby from Agilent Technologies and Dr. Tonya Pekar and Dr. Larry Burchfield from Thermo Electron Corporation for performing the MS analyses of the active kinases. We also thank Dr. June Simpson for kindly reviewing this manuscript. This work was supported in part by Conacyt, Mexico (grant no. 31802N). Conacyt also granted a postdoctoral fellowship to MTCR.
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Lino, B., Carrillo-Rayas, M.T., Chagolla, A. et al. Purification and characterization of a calcium-dependent protein kinase from beetroot plasma membranes. Planta 225, 255–268 (2006). https://doi.org/10.1007/s00425-006-0343-8
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DOI: https://doi.org/10.1007/s00425-006-0343-8