Biochemical characterization of Ca2+/calmodulin dependent protein kinase from Candida albicans.
A multifunctional Ca2+/calmodulin dependent protein kinase was purified approximately 650 fold from cytosolic extract of Candida albicans. The purified preparation gave a single band of 69 kDa on sodium dodecyl sulfate polyacrylamide gel electrophoresis with its native molecular mass of 71 kDa suggesting that the enzyme is monomeric. Its activity was dependent on calcium, calmodulin and ATP when measured at saturating histone IIs concentration. The purified Ca2+/CaMPK was found to be autophosphorylated at serine residue(s) in the presence of Ca2+/calmodulin and enzyme stimulation was strongly inhibited by W-7 (CaM antagonist) and KN-62 (Ca2+/CaM dependent PK inhibitor). These results confirm that the purified enzyme is Ca2+/CaM dependent protein kinase of Candida albicans. The enzyme phosphorylated a number of exogenous and endogenous substrates in a Ca2+/calmodulin dependent manner suggesting that the enzyme is a multifunctional Ca2+/calmodulin-dependent protein kinase of Candida albicans.
Department of Biochemistry, Postgraduate Institute of Medical Education and Research, Chandigarh, India.
Navneet Kaur
NK
Dhillon
Sadhna
S
Sharma
G K
GK
Khuller
D000595:Amino Acid Sequence; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000302:isolation & purification / Q000378:metabolism*; D002176:Candida albicans / Q000201:enzymology*; D002850:Chromatography, Gel; D004591:Electrophoresis, Polyacrylamide Gel; D007700:Kinetics; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010766:Phosphorylation
D017871:Calcium-Calmodulin-Dependent Protein Kinases