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2016 ; 55
(49
): 6880-6896
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Binding Properties of the Transforming Growth Factor-? Coreceptor Betaglycan:
Proposed Mechanism for Potentiation of Receptor Complex Assembly and Signaling
#MMPMID27951653
Villarreal MM
; Kim SK
; Barron L
; Kodali R
; Baardsnes J
; Hinck CS
; Krzysiak TC
; Henen MA
; Pakhomova O
; Mendoza V
; O'Connor-McCourt MD
; Lafer EM
; López-Casillas F
; Hinck AP
Biochemistry
2016[Dec]; 55
(49
): 6880-6896
PMID27951653
show ga
Transforming growth factor (TGF) ?1, ?2, and ?3 (TGF-?1-TGF-?3, respectively) are
small secreted signaling proteins that each signal through the TGF-? type I and
type II receptors (T?RI and T?RII, respectively). However, TGF-?2, which is
well-known to bind T?RII several hundred-fold more weakly than TGF-?1 and TGF-?3,
has an additional requirement for betaglycan, a membrane-anchored nonsignaling
receptor. Betaglycan has two domains that bind TGF-?2 at independent sites, but
how it binds TGF-?2 to potentiate T?RII binding and how the complex with TGF-?,
T?RII, and betaglycan undergoes the transition to the signaling complex with
TGF-?, T?RII, and T?RI are not understood. To investigate the mechanism, the
binding of the TGF-?s to the betaglycan extracellular domain, as well as its two
independent binding domains, either directly or in combination with the T?RI and
T?RII ectodomains, was studied using surface plasmon resonance, isothermal
titration calorimetry, and size-exclusion chromatography. These studies show that
betaglycan binds TGF-? homodimers with a 1:1 stoichiometry in a manner that
allows one molecule of T?RII to bind. These studies further show that betaglycan
modestly potentiates the binding of T?RII and must be displaced to allow T?RI to
bind. These findings suggest that betaglycan functions to bind and concentrate
TGF-?2 on the cell surface and thus promote the binding of T?RII by both
membrane-localization effects and allostery. These studies further suggest that
the transition to the signaling complex is mediated by the recruitment of T?RI,
which simultaneously displaces betaglycan and stabilizes the bound T?RII by
direct receptor-receptor contact.