Evidence for a new, high-molecular weight isoform of protein kinase C in rat hippocampus.
We describe a new form of protein kinase C (PKC) with a molecular weight of 97 kDa, higher than the known forms of vertebrate PKC. This putative new high-molecular weight isoform, which we are calling PKC (HMW), is increased in the membrane fraction either upon application of phorbol esters or with afferent synaptic stimulation of Schaffer collaterals in hippocampal slices. The protein cross-reacts on immunoblot with affinity-purified polyclonal antiserum raised against a peptide derived from the carboxy-terminus of PKC eta; it does not cross-react, however, with antiserum against the amino-terminal region of PKC eta. In the tissues examined, PKC(HMW) is localized primarily in brain, in contrast to PKC eta, which is found predominantly in lung and skin.
Sublette
E
E
Department of Pharmacology, State University of New York at Brooklyn 11203.
Naik
M U
MU
Jiang
X
X
Osten
P
P
Valsamis
H
H
Osada
S
S
Ohno
S
S
Sacktor
T C
TC
D000595:Amino Acid Sequence; D000818:Animals; D006624:Hippocampus / Q000187:drug effects / Q000201:enzymology*; D015151:Immunoblotting; D007527:Isoenzymes / Q000737:chemistry / Q000276:immunology / Q000378:metabolism*; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009475:Neurons, Afferent / Q000201:enzymology; D010703:Phorbol Esters / Q000494:pharmacology; D011493:Protein Kinase C / Q000737:chemistry / Q000276:immunology / Q000378:metabolism*; D051381:Rats
D007527:Isoenzymes; D010703:Phorbol Esters; D011493:Protein Kinase C