Identification of a major maturation-activated acetyl-CoA carboxylase kinase in sea star oocytes as p44 super(mpk)
Maturation-activated protein-serine/threonine kinases were investigated in the high-speed supernatant fractions from sea-star oocytes harvested at the time of germinal vesicle breakdown. One of the major stimulated protein kinases able to phosphorylate acetyl-CoA carboxylase in these extracts was fo...
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| Veröffentlicht in: | Biochemical journal 1991-01, Vol.274 (3), p.759-767 |
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| container_end_page | 767 |
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| container_issue | 3 |
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| container_title | Biochemical journal |
| container_volume | 274 |
| creator | Pelech, S L Sanghera, J S Paddon, H B Quayle, KA Brownsey, R W |
| description | Maturation-activated protein-serine/threonine kinases were investigated in the high-speed supernatant fractions from sea-star oocytes harvested at the time of germinal vesicle breakdown. One of the major stimulated protein kinases able to phosphorylate acetyl-CoA carboxylase in these extracts was found to co-purify with a 44 kDa myelin basic protein kinase (p44 super(mpk)) that is activated with a similar time course during oocyte maturation. Purified sea-star oocyte p44 super(mpk) phosphorylated acetyl-CoA carboxylase (purified from rat liver) predominantly on serine and to a small extent on threonine. Furthermore, the phosphorylation of acetyl-CoA carboxylase occurred principally on a tryptic phosphopeptide which displayed electrophoretic and chromatographic properties very similar to those of the peptide that has previously been shown to undergo increased phosphorylation in response to insulin in rat adipocytes. |
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One of the major stimulated protein kinases able to phosphorylate acetyl-CoA carboxylase in these extracts was found to co-purify with a 44 kDa myelin basic protein kinase (p44 super(mpk)) that is activated with a similar time course during oocyte maturation. Purified sea-star oocyte p44 super(mpk) phosphorylated acetyl-CoA carboxylase (purified from rat liver) predominantly on serine and to a small extent on threonine. Furthermore, the phosphorylation of acetyl-CoA carboxylase occurred principally on a tryptic phosphopeptide which displayed electrophoretic and chromatographic properties very similar to those of the peptide that has previously been shown to undergo increased phosphorylation in response to insulin in rat adipocytes.</abstract></addata></record> |
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| identifier | ISSN: 0264-6021 |
| ispartof | Biochemical journal, 1991-01, Vol.274 (3), p.759-767 |
| issn | 0264-6021 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_16043860 |
| source | EZB-FREE-00999 freely available EZB journals; PubMed Central; Alma/SFX Local Collection |
| subjects | Asteroidea biochemical analysis eggs enzymatic activity Marine maturation p44 super(mpk) protein |
| title | Identification of a major maturation-activated acetyl-CoA carboxylase kinase in sea star oocytes as p44 super(mpk) |
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