Oocyte Maturation and Furrow Formation in an Unfertilized Egg by Fusion with a Fertilized Egg or Blastomeres in the Ascidian, Ascidia sydneiensis divisa. (ascidian egg/cell fusion/oocyte maturation/polar body extrusion/furrow formation)
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چکیده
منابع مشابه
VanabinP, a novel vanadium-binding protein in the blood plasma of an ascidian, Ascidia sydneiensis samea.
Some ascidians accumulate high levels of the transition metal vanadium in their blood cells. The process of vanadium accumulation has not yet been elucidated. In this report, we describe the isolation and cDNA cloning of a novel vanadium-binding protein, designated as VanabinP, from the blood plasma of the vanadium-rich ascidian, Ascidia sydneiensis samea. The predicted amino acid sequence of V...
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A gastrulation center is described in ascidian eggs. Extensive cytoplasmic rearrangements occur in ascidian eggs between fertilization and first cleavage. During ooplasmic segregation, a specific cytoskeletal domain (the myoplasm) is translocated first to the vegetal pole (VP) and then to the posterior region of the zygote. A few hours later, gastrulation is initiated by invagination of endoder...
متن کاملCleavage Furrow Formation in a Telolecithal Egg
Formation of the first cleavage furrow in the telolecithal egg of Loligo was studied with the electron microscope . Before the actual furrow forms, a dense filamentous band develops below the plasma membrane from membrane-bounded dense bodies which appear to be Golgi-derived . The egg surface is thrown into a number of longitudinal folds which parallel the furrow and eventually become incorpora...
متن کاملGlutathione transferases with vanadium-binding activity isolated from the vanadium-rich ascidian Ascidia sydneiensis samea.
Some ascidians accumulate vanadium in vanadocytes, which are vanadium-containing blood cells, at high levels and with high selectivity. However, the mechanism and physiological significance of vanadium accumulation remain unknown. In this study, we isolated novel proteins with a striking homology to glutathione transferases (GSTs), designated AsGST-I and AsGST-II, from the digestive system of t...
متن کاملSelective metal binding by Vanabin2 from the vanadium-rich ascidian, Ascidia sydneiensis samea.
Vanadium-binding proteins, or Vanabins, have recently been isolated from the vanadium-rich ascidian, Ascidia sydneiensis samea. Recent reports indicate that Vanabin2 binds twenty V(IV) ions at pH 7.5, and that it has a novel bow-shaped conformation. However, the role of Vanabin2 in vanadium accumulation by the ascidian has not yet been determined. In the present study, the effects of acidic pH ...
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ژورنال
عنوان ژورنال: Development, Growth and Differentiation
سال: 1994
ISSN: 0012-1592,1440-169X
DOI: 10.1111/j.1440-169x.1994.00373.x