however , major quantitative differences appear to exist : whereas synapsin i phosphorylation is relatively weak , the major kinase substrates of gcps are a 46,000-dalton membrane protein ( calcium/calmodulin dependent ) and two acidic proteins of 80,000 and 40,000 daltons , phosphorylated by a calcium/phospholipid-dependent protein kinase .
C0031715
phosphorylation
C0031727
kinase