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2016 ; 129
(12
): 2394-406
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The O-glycosylated ectodomain of FXYD5 impairs adhesion by disrupting cell-cell
trans-dimerization of Na,K-ATPase ?1 subunits
#MMPMID27142834
Tokhtaeva E
; Sun H
; Deiss-Yehiely N
; Wen Y
; Soni PN
; Gabrielli NM
; Marcus EA
; Ridge KM
; Sachs G
; Vazquez-Levin M
; Sznajder JI
; Vagin O
; Dada LA
J Cell Sci
2016[Jun]; 129
(12
): 2394-406
PMID27142834
show ga
FXYD5 (also known as dysadherin), a regulatory subunit of the Na,K-ATPase,
impairs intercellular adhesion by a poorly understood mechanism. Here, we
determined whether FXYD5 disrupts the trans-dimerization of Na,K-ATPase molecules
located in neighboring cells. Mutagenesis of the Na,K-ATPase ?1 subunit
identified four conserved residues, including Y199, that are crucial for the
intercellular Na,K-ATPase trans-dimerization and adhesion. Modulation of
expression of FXYD5 or of the ?1 subunit with intact or mutated ?1-?1 binding
sites demonstrated that the anti-adhesive effect of FXYD5 depends on the presence
of Y199 in the ?1 subunit. Immunodetection of the plasma membrane FXYD5 was
prevented by the presence of O-glycans. Partial FXYD5 deglycosylation enabled
antibody binding and showed that the protein level and the degree of
O-glycosylation were greater in cancer than in normal cells. FXYD5-induced
impairment of adhesion was abolished by both genetic and pharmacological
inhibition of FXYD5 O-glycosylation. Therefore, the extracellular O-glycosylated
domain of FXYD5 impairs adhesion by interfering with intercellular ?1-?1
interactions, suggesting that the ratio between FXYD5 and ?1-?1 heterodimer
determines whether the Na,K-ATPase acts as a positive or negative regulator of
intercellular adhesion.