Table II.

Known potential CDPK substrates2-a

SubstrateSite2-bSubstrate Source (Species)2-dCDPK Species (CDPK)2-ePotential Effect2-fRef2-g
Metabolism
 Nitrate reductaseSGPTLKRTASTPFMNLeaves (spinach)Spinach (PKI, PKII); AtCPK3A1–3
 Phosphoenolpyruvate  carboxylaseRoot nodulesSoybean4
 Phosphoenolpyruvate  carboxylaseAPGPGEKHHSIDAQLLeavesMaize5
 PSII D1Peptide Spirodelasp.B6
 Suc-phosphate synthaseTKGRMRRISSVEMMDLeavesSpinach (PKI)A1,7
 Suc synthaseATDRLTRVHSLRERLRec (mung bean)Soybean (nodule)C8
 Suc synthase 2GDRVLSRLHSVRERILeavesMaizeA,D9,10
 Suc synthase (nod 100)ATDRLTRVHSLRERLRoot nodulesSoybeanD11
Stress-related proteins
 PALVSXVXKRXLTTXXXXCell culture, rec (poplar [Populus × generosa])French bean (Phaseolus vulgaris); AtCPK1E12,13
 Pseudoresponse regulatorLeavesIce plant (Mesembryanthemum crystallinumMcCDPK1)14
Antifungal proteins
 Carboxypeptidase inhibitorAWFCQACWNSARTCGTuber (potato)Wheat (embryo)15
 γ-ThioninsUKLCQRPSGTWSG2-c Seeds (yellow mustard [Sinapis alba])Wheat (embryo)16
 Lipid transfer proteinsVXSXXXPCXS/TYXXGXSeeds (wheat [Triticum aestivum] and barley)Wheat (embryo)17
 NapinsQGQQLQQVISRIYQT2-c Seeds (kohlrabi [Brassica napus var. rapifera])Wheat (embryo)18
 Protease inhibitorSDMRLNSCHSACKSC(Soybean)Wheat (embryo)19
Ion/water transport
 Aquaglyceroporin (nod 26)PLSEITKSASFLKGRRoot nodulesSoybeanF20,21
 Aquaglyceroporin (LIMP2)PLRFITKNVSFLKGIPeptide Lotus japonicus 22
 Aquaporin PM28ARAAAIKALGSFRSNPeptideSpinach (PKI, PKII)23
 Ca2+-ATPase ACA2RRFRFTANLSKRYEARecArabidopsis (AtCPK1)G24
 PM H+-ATPaseRootsOat, maize25,26
 Potassium channel KAT1Guard cells V. faba G27,28
Other
 Actin-depolymerizing  factorMANARSGVAVNCell cultures (maize)French beanG29
 CDPK-related kinaseRKAALRALSKTLTVPeptideCarrot (DcCPK1)30
 Myosin light chain Chara 31
 PI 4-kinase activatorCell culturesCarrotB32
 Proteasome regulatory sub.PeptideTobacco (NtCDPK1)33
 Self-incompatibility RNasesStyle N. alata (pollen tube)34
 Ser acetyltransferaseCell culturesSoybeanH35