Isolation of cDNAs encoding typical and novel types of phosphoinositide-specific phospholipase C from the moss Physcomitrella patens.
Two cDNAs encoding proteins, PpPLC1 and PpPLC2, with catalytic and C2 domains conserved in plant phosphoinositide-specific phospholipase C (PI-PLC) were isolated from Physcomitrella patens. The N domain, which has been identified in Arabidopsis PI-PLCs as an EF hand-like domain, was found in both isoforms, although that in PpPLC2 was a split type. At micromolar Ca2+ concentrations, PpPLC1 preferentially hydrolysed phosphatidylinositol-4,5-bisphosphate, while PpPLC2 showed no specificity. Furthermore, at millimolar Ca2+, phosphatidylinositol was hydrolysed by PpPLC2, but not by PpPLC1. Thus, PpPLC1 and PpPLC2 are typical and novel types of plant PI-PLC, respectively.
Mikami
Koji
K
National Institute for Basic Biology, 38 Nishigonaka, Myodaiji, Okazaki 444-8585, Japan. mikami@nibb.ac.jp
Repp
Alexander
A
Graebe-Abts
Elena
E
Hartmann
Elmar
E
D001483:Base Sequence; D019068:Bryopsida / Q000201:enzymology / Q000235:genetics*; D018076:DNA, Complementary / Q000737:chemistry / Q000235:genetics; D008969:Molecular Sequence Data; D043265:Phosphatidylinositol Diacylglycerol-Lyase / Q000235:genetics* / Q000378:metabolism; D054801:Phosphoinositide Phospholipase C; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D017422:Sequence Analysis, DNA; D012689:Sequence Homology, Nucleic Acid
D018076:DNA, Complementary; D010940:Plant Proteins; D054801:Phosphoinositide Phospholipase C; D043265:Phosphatidylinositol Diacylglycerol-Lyase