Comparison of Ca2+/calmodulin-dependent protein kinase II purified from control and diisopropyl phosphorofluoridate (DFP)-treated hens.

Abstract:

:Diisopropyl phosphorofluoridate (DFP) produces type I organophosphorus ester-induced delayed neurotoxicity in humans and sensitive animal species. This is accompanied by enhanced Ca2+/CaM-dependent protein kinase II (CaM-kinase II) activity, and [125I]calmodulin binding to CaM-kinase II in DFP-treated hen brain supernatant without increase in the enzyme quantity. We have purified CaM-kinase II from control and DFP-treated hen whole brains and compared various physical and biochemical properties. The two enzymes exhibited similar properties in many respects. However, there was a decrease in calcium-independent protein kinase II activity after autophosphorylation, and an increase in K0.5 for free calcium and calmodulin of enzyme purified from DFP-treated hen brains. This change in kinetic parameters may result in greater percentage of total CaM-kinase II present in unphosphorylated form, which is consistent with the increased autophosphorylation of CaM-kinase II and [125I]calmodulin binding in the brain supernatant of DFP-treated hens.

journal_name

Neurochem Res

journal_title

Neurochemical research

authors

Gupta RP,Abou-Donia MB

doi

10.1007/BF00969081

subject

Has Abstract

pub_date

1993-03-01 00:00:00

pages

259-69

issue

3

eissn

0364-3190

issn

1573-6903

journal_volume

18

pub_type

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