Title
Regulation of the SHP-2 tyrosine phosphatase by a novel cholesterol- and cell confluence-dependent mechanism
UMMS Affiliation
Graduate School of Biomedical Sciences; Program in Molecular Medicine
Publication Date
2003-03-04
Document Type
Article
Disciplines
Life Sciences | Medicine and Health Sciences
Abstract
Endothelial cells approaching confluence exhibit marked decreases in tyrosine phosphorylation of receptor tyrosine kinases and adherens junctions proteins, required for cell cycle arrest and adherens junctions stability. Recently, we demonstrated a close correlation in endothelial cells between membrane cholesterol and tyrosine phosphorylation of adherens junctions proteins. Here, we probe the mechanistic basis for this correlation. We find that as endothelial cells reach confluence, the tyrosine phosphatase SHP-2 is recruited to a low-density membrane fraction in a cholesterol-dependent manner. Binding of SHP-2 to this fraction was not abolished by phenyl phosphate, strongly suggesting that this binding was mediated by other regions of SHP-2 beside its SH2 domains. Annexin II, previously implicated in cholesterol trafficking, was associated in a complex with SHP-2, and both proteins localized to adhesion bands in confluent endothelial monolayers. These studies reveal a novel, cholesterol-dependent mechanism for the recruitment of signaling proteins to specific plasma membrane domains via their interactions with annexin II.
DOI of Published Version
10.1074/jbc.M210701200
Source
J Biol Chem. 2003 May 16;278(20):18360-7. Epub 2003 Feb 27. Link to article on publisher's site
Journal/Book/Conference Title
The Journal of biological chemistry
Related Resources
PubMed ID
12611902
Repository Citation
Burkart A, Samii B, Corvera S, Shpetner HS. (2003). Regulation of the SHP-2 tyrosine phosphatase by a novel cholesterol- and cell confluence-dependent mechanism. GSBS Student Publications. https://doi.org/10.1074/jbc.M210701200. Retrieved from https://escholarship.umassmed.edu/gsbs_sp/154