Characterization of a calcium- and lipid-dependent protein kinase associated with the plasma membrane of oat

Journal Article · Tue Feb 18 00:00:00 EST 1992 · Biochemistry; (United States)

DOI:https://doi.org/10.1021/bi00121a020· OSTI ID:5618952

Schaller, G E; Sussman, M R ^[1]; Harmon, A C ^[2]

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1. Univ. of Wisconsin, Madison (United States)
2. Univ. of Florida, Gainesville (United States)

A protein kinase that is activated by calcium and lipid has been partially purified from the plasma membrane of oat roots. This protein kinase cross-reacts with four monoclonal antibodies directed against a soluble calcium-dependent protein kinase from soybean described previously indicating that the oat enzyme is a member of this calcium-dependent protein kinase family. Immunoblots demonstrate that the membrane-derived protein kinase is slightly larger than that observed in the cytosolic fraction of oat. Limited digestion of the membrane-derived kinase with trypsin generates a smaller water-soluble kinase that is still activated by calcium but is no longer activated by lipid. When posthomogenization proteolysis is minimized, the bulk of the immunoreactive kinase material is localized in the membrane. These results suggest that a calcium-dependent protein kinase observed in the supernatant fraction of oat extracts may originate in situ from a calcium- and lipid-dependent protein kinase which is associated with the oat plasma membrane. They further indicate that, in contrast to animal cells, the predominant calcium- and lipid-dependent protein kinase associated with the plasma membrane of plant cells has biochemical properties and amino acid sequence unlike protein kinase C.

• DOE Contract Number: AC02-83ER13086
• OSTI ID: 5618952
• Journal Information: Biochemistry; (United States), Vol. 31:6; ISSN 0006-2960
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
PHOSPHOTRANSFERASES
ENZYME ACTIVITY
CALCIUM COMPOUNDS
CELL MEMBRANES
ENZYME INDUCTION
LIPIDS
OATS
ALKALINE EARTH METAL COMPOUNDS
CELL CONSTITUENTS
CEREALS
ENZYMES
GENE REGULATION
GRAMINEAE
LILIOPSIDA
MAGNOLIOPHYTA
MEMBRANES
ORGANIC COMPOUNDS
PHOSPHORUS-GROUP TRANSFERASES
PLANTS
PROTEINS
TRANSFERASES
550200* - Biochemistry