| Association of protein kinase C with phospholipid monolayers: two-stage irreversible binding. | |
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MedLine Citation:
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PMID: 3143405 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The association of protein kinase C (PKC) with phospholipid (PL) monolayers spread at the air-water interface was examined. PKC-PL binding induced surface pressure changes that were dependent on the amount of PKC, the phospholipid composition of the monolayers, the presence of Ca2+, and the initial surface pressure of the monolayer (pi 0). Examination of surface pressure increases induced by PKC as a function of phospholipid surface pressure, pi 0, revealed that PKC-phosphatidylserine (PS) association had a critical pressure of 43 dyn/cm. Above this surface pressure, PKC cannot cause further surface pressure changes. This high critical pressure indicated that PKC should be able to penetrate many biological membranes which appear to have surface pressures of about 30 dyn/cm. PKC-induced surface pressure changes were Ca2+ dependent only for PL monolayers spread at a pi 0 greater than 26 dyn/cm. PKC alone (in the absence of PL) formed a film at the air-water interface with a surface pressure of about 26 dyn/cm. Calcium-dependent binding was studied at the higher surface pressures which effectively excluded PKC from the air-water interface. Subphase depletion measurements suggested that association of PKC with PS monolayers consisted of two stages: a rapid Ca2+-dependent interaction followed by a slower process that resulted in irreversible binding of PKC to the monolayer. The second stage appeared to involve penetration of PKC into the hydrocarbon region of the phospholipid. The commonly used in vitro substrates for PKC, histone and protamine sulfate, also associated with and penetrated PS monolayers with critical pressures of 50 and 60 dyn/cm, respectively.(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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M D Bazzi; G L Nelsestuen |
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Publication Detail:
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Type: In Vitro; Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Biochemistry Volume: 27 ISSN: 0006-2960 ISO Abbreviation: Biochemistry Publication Date: 1988 Sep |
Date Detail:
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Created Date: 1989-01-17 Completed Date: 1989-01-17 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0370623 Medline TA: Biochemistry Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 6776-83 Citation Subset: IM |
Affiliation:
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Department of Biochemistry, University of Minnesota, St. Paul 55108. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Binding Sites Calcium / pharmacology Egtazic Acid / pharmacology Kinetics Phosphatidylserines Phospholipids / metabolism* Pressure Protein Kinase C / metabolism* |
| Grant Support | |
ID/Acronym/Agency:
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GM 38819/GM/NIGMS NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Phosphatidylserines; 0/Phospholipids; 67-42-5/Egtazic Acid; 7440-70-2/Calcium; EC 2.7.11.13/Protein Kinase C |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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