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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Machaca, Khaled Edmondson, Ricky D. Haun, Shirley Jones, Richard C. Sun, Lu |
| Description | Author Affiliation: Sun L ( Department of Physiology and Biophysics, University of Arkansas for Medical Science, Little Rock, Arkansas 72205, USA.) |
| Abstract | Fertilization induces a species-specific Ca(2+) transient with specialized spatial and temporal dynamics, which are essential to temporally encode egg activation events such as the block to polyspermy and resumption of meiosis. Eggs acquire the competence to produce the fertilization-specific Ca(2+) transient during oocyte maturation, which encompasses dramatic potentiation of inositol 1,4,5-trisphosphate (IP(3))-dependent Ca(2+) release. Here we show that increased IP(3) receptor (IP(3)R) sensitivity is initiated at the germinal vesicle breakdown stage of maturation, which correlates with maturation promoting factor (MPF) activation. Extensive phosphopeptide mapping of the IP(3)R resulted in approximately 70% coverage and identified three residues, Thr-931, Thr-1136, and Ser-114, which are specifically phosphorylated during maturation. Phospho-specific antibody analyses show that Thr-1136 phosphorylation requires MPF activation. Activation of either MPF or the mitogen-activated protein kinase cascade independently, functionally sensitizes IP(3)-dependent Ca(2+) release. Collectively, these data argue that the kinase cascades driving meiotic maturation potentiates IP(3)-dependent Ca(2+) release, possibly trough direct phosphorylation of the IP(3)R. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 30 |
| Volume Number | 284 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2009-07-24 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Inositol 1,4,5-Trisphosphate Receptors Metabolism Maturation-Promoting Factor Oocytes Oogenesis Xenopus Physiology Amino Acid Sequence Animals Calcium Calcium Signaling Inositol 1,4,5-Trisphosphate Mice Molecular Sequence Data Cytology Phosphopeptides Phosphorylation Phosphotransferases Sequence Alignment Research Support, N.I.H., Extramural Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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