Abstract:
:DEAE-cellulose column chromatography of Neurospora crassa soluble mycelial extracts leads to the resolution of three major protein kinase activity peaks designated PKI, PKII, and PKIII. PKII activity is stimulated by Ca2+ and Neurospora or brain calmodulin. Maximal stimulation was observed at 2 microM-free Ca2+ and 1 microgram/ml of the modulator. The stimulatory effect of the Ca(2+)-calmodulin complex was blocked by EGTA and by some calmodulin antagonists such as phenothiazine drugs or compound 48/80. PKII phosphorylates different proteins, among which histone II-A at a low concentration and CDPKS, the synthetic peptide specific for Ca(2+-)-calmodulin dependent protein kinase, are the best substrates. Some phosphorylation can be detected in the absence of any exogenous acceptor. PKII activity assayed in the presence of histone II-A or in the absence of exogenous phosphate acceptor (autophosphorylation) co-elute in a DEAE-cellulose column at 0.28 NaCl. As result of the autophosphorylation reaction of the purified enzyme a main phosphorylated component of 70 kDa was resolved by SDS-polyacrylamide gel electrophoresis. It is possible that this component is an active part of this enzyme.
journal_name
Mol Cell Biochemjournal_title
Molecular and cellular biochemistryauthors
Ulloa RM,Torres HN,Ochatt CM,Téllez-Iñón MTdoi
10.1007/BF00234573keywords:
subject
Has Abstractpub_date
1991-04-10 00:00:00pages
155-63issue
2eissn
0300-8177issn
1573-4919journal_volume
102pub_type
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