Calcium- and myristoyl-dependent subcellular localization of the neuronal calcium-binding protein VILIP in transfected PC12 cells

被引:20
作者
Spilker, C [1 ]
Gundelfinger, ED [1 ]
Braunewell, KH [1 ]
机构
[1] FED INST NEUROBIOL,DEPT MOL BIOL & NEUROCHEM,D-39008 MAGDEBURG,GERMANY
关键词
calcium-binding protein; calcium-myristoyl switch; cell transfection; myristoyl mutant; PC12; subcellular localization;
D O I
10.1016/S0304-3940(97)00201-2
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Wild-type neuronal calcium-binding protein VILIP (visinin-like protein), and a myristoylation mutant of VILIP which lacks the consensus sequence for N-terminal myristoylation, have been stably transfected in PC12 cells. Immunocytochemical studies of VILIP-transfected PC12 cells have revealed that wild-type VILIP is strongly concentrated at the cell membrane, particularly at cell-cell contact sites, but is also distributed throughout the cytosol at moderate levels. In contrast, myristoylation-mutant VILIP shows a more even distribution, with significantly less association at cell-cell contact sites. Western blot analysis of subcellular fractions has shown that wild-type VILIP associates in a calcium-dependent manner with membrane fractions, whereas the myristoylation mutant only weakly associates with this fraction. Therefore, a calcium-myristoyl switch seems to be a major, but not sole determinant for the association of VILIP with membranes in Living cells. (C) 1997 Elsevier Science Ireland Ltd.
引用
收藏
页码:126 / 128
页数:3
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