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Identification and functional analysis of novel phosphorylation sites in Cx43 in rat primary granulosa cells
Author(s) -
Yogo Keiichiro,
Ogawa Takuya,
Akiyama Motofusa,
Ishida Norihiro,
Takeya Tatsuo
Publication year - 2002
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(02)03441-5
Subject(s) - phosphorylation , serine , microbiology and biotechnology , intracellular , stimulation , protein phosphorylation , gap junction , folliculogenesis , biology , chemistry , endocrinology , protein kinase a , embryo , embryogenesis
The gap junctional intercellular communication mediated by Cx43 plays indispensable roles in both germ line development and postnatal folliculogenesis. In this study, we focused on the effect of follicle‐stimulating hormone (FSH) on the Cx43 protein in rat primary granulosa cells and found that FSH stimulation elevated the phosphorylation in addition to the protein level of Cx43. Serine residues in the carboxyl‐terminal region were exclusively phosphorylated in this system and we identified Ser365, Ser368, Ser369 and Ser373 as major phosphorylation sites by FSH stimulation. A Cx43 variant containing mutations at all these serine residues was found to severely reduce dye transfer activity when assayed in HeLa cells. The present study revealed a novel regulatory mechanism of Cx43‐mediated gap junctional intercellular communication through phosphorylation in the carboxyl‐terminus.