The serine/threonine kinase Par1b regulates epithelial lumen polarity via IRSp53-mediated cell-ECM signaling.
The serine/threonine kinase Par1b regulates epithelial lumen polarity via IRSp53-mediated cell-ECM signaling.
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DOI:
10.1083/jcb.201007002
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发表时间:
2011-02-07
期刊:
影响因子:
--
通讯作者:
Müsch A
中科院分区:
文献类型:
--
作者:
Cohen D;Fernandez D;Lázaro-Diéguez F;Müsch A
Par1b regulates cell–ECM signaling and dictates epithelial lumenal organization by targeting IRSp53, a Rho GTPase adaptor and scaffolding protein. The serine/threonine kinase Par1b promotes cell–cell adhesion and determines the polarity of the luminal domain in epithelial cells. In this study, we demonstrate that Par1b also regulates cell–extracellular matrix (ECM) signaling in kidney-derived Madin–Darby canine kidney (MDCK) cells and identified the rho–guanosine triphosphatase adaptor and scaffolding protein IRSp53 as a Par1b substrate involved in this pathway. Par1b overexpression inhibits basal lamina formation, cell spreading, focal adhesion, stress fiber formation, and compaction, whereas Par1b depletion has the opposite effect. IRSp53 depletion mimics Par1b overexpression on cell–ECM signaling and lumen polarity but had no effect on adherens junction formation. Par1b directly phosphorylates IRSp53 on S366 in cell lysates and stimulates phosphorylation on S453/3/5 via an indirect mechanism. A Par1b phosphorylation–deficient IRSp53 mutant but not the wild-type protein efficiently rescues both the cell spreading and the lumen polarity defects in Par1b MDCK cells. Our data suggest a model in which Par1b phosphorylation prevents recruitment of IRSp53 effector proteins to its Src homology domain 3 by promoting 14-3-3 binding in the vicinity of that domain.
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影响因子:
2.9
作者:
DUNN, JCY;TOMPKINS, RG;YARMUSH, ML
通讯作者:
YARMUSH, ML
DOI:
10.1042/bj20091834
发表时间:
2010-03-15
期刊:
The Biochemical journal
影响因子:
--
作者:
Johnson C;Crowther S;Stafford MJ;Campbell DG;Toth R;MacKintosh C
通讯作者:
MacKintosh C
DOI:
10.1073/pnas.0708966105
发表时间:
2008-02-05
影响因子:
11.1
作者:
Blethrow, Justin D.;Glavy, Joseph S.;Shokat, Kevan M.
通讯作者:
Shokat, Kevan M.
影响因子:
4.5
作者:
Massari, Silvia;Perego, Carla;Pietrini, Grazia
通讯作者:
Pietrini, Grazia
影响因子:
5.4
作者:
Mackie, S;Aitken, A
通讯作者:
Aitken, A