A differential location of phosphoinositide kinases, diacylglycerol kinase, and phospholipase C in the nuclear matrix
Several enzymes involved in the phosphoinositide metabolism have been shown to be present in nuclei of rat liver and Friend cells. In this paper we demonstrate that nuclear matrices of mouse NIH 3T3-fibroblasts and rat liver cells, isolated by nuclease treatment and high salt extraction, contain pho...
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Published in | The Journal of biological chemistry Vol. 267; no. 8; pp. 5078 - 5084 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Bethesda, MD
American Society for Biochemistry and Molecular Biology
15.03.1992
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Subjects | |
Online Access | Get full text |
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Summary: | Several enzymes involved in the phosphoinositide metabolism have been shown to be present in nuclei of rat liver and Friend
cells. In this paper we demonstrate that nuclear matrices of mouse NIH 3T3-fibroblasts and rat liver cells, isolated by nuclease
treatment and high salt extraction, contain phosphatidylinositol 4-kinase (PdtIns 4-kinase), phosphatidylinositol 4-phosphate
5-kinase (PtdIns(4)P 5-kinase), diacylglycerol kinase, and phospholipase C. By a selective extraction the nucleus can be dissected
in the peripheral matrix (lamina-pore complex) and the internal matrix as shown by using marker antibodies. Surprisingly,
PtdIns 4-kinase was found exclusively in the peripheral nuclear matrix, whereas PtdIns(4)P 5-kinase was found to be associated
to internal matrix structures. Diacylglycerol kinase and phospholipase C activities were also preferentially detected in the
internal matrix. These data demonstrate a differential localization of the phosphoinositide kinases in the nucleus and suggest
that the phosphoinositide metabolism may play a specific role in the nucleus. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0021-9258 1083-351X |
DOI: | 10.1016/s0021-9258(18)42732-9 |