TY - JOUR
T1 - Mapping the minimum domain of the fibronectin binding site on transglutaminase 2 (TG2) and its importance in mediating signaling, adhesion, and migration in TG2-expressing cells
AU - Soluri, Maria Felicia
AU - Boccafoschi, Francesca
AU - Cotella, Diego
AU - Moro, Laura
AU - Forestieri, Gabriela
AU - Autiero, Ida
AU - Cavallo, Luigi
AU - Oliva, Romina
AU - Griffin, Martin
AU - Wang, Zhuo
AU - Santoro, Claudio
AU - Sblattero, Daniele
PY - 2019/1/30
Y1 - 2019/1/30
N2 - The interaction between the enzyme transglutaminase 2 (TG2) and fibronectin (FN) is involved in the cellmatrix interactions that regulate cell signaling, adhesion, and migration and play central roles in pathologic conditions, particularly fibrosisandcancer.Aprecisedefinitionof the exact interactiondomainsonboth proteins couldprovide a tool to design novelmolecules with potential therapeutic applications.Although specific residues involved in the interaction within TG2 have been analyzed, little is known regarding the TG2 binding site on FN. This site has been mapped to a large internal 45-kDa protein fragment coincident with the gelatin binding domain (GBD). With the goal of defining the minimal FN interacting domain for TG2, we produced several expression constructs encoding different portions or modules of the GBD and tested their binding and functional properties. The results demonstrate that the I8 module is necessary and sufficient forTG2-binding in vitro, but does not have functional effects on TG2-expressing cells.Modules I7 and I9 increase the strength of the binding and are required for cell adhesion. A 15-kDa fragment encompassing modules I7-9 behaves as the whole 45-kDa GBD and mediates signaling, adhesion, spreading, and migration of TG2
+ cells.Thisstudy providesnewinsights into themechanismforTG2binding toFN.
AB - The interaction between the enzyme transglutaminase 2 (TG2) and fibronectin (FN) is involved in the cellmatrix interactions that regulate cell signaling, adhesion, and migration and play central roles in pathologic conditions, particularly fibrosisandcancer.Aprecisedefinitionof the exact interactiondomainsonboth proteins couldprovide a tool to design novelmolecules with potential therapeutic applications.Although specific residues involved in the interaction within TG2 have been analyzed, little is known regarding the TG2 binding site on FN. This site has been mapped to a large internal 45-kDa protein fragment coincident with the gelatin binding domain (GBD). With the goal of defining the minimal FN interacting domain for TG2, we produced several expression constructs encoding different portions or modules of the GBD and tested their binding and functional properties. The results demonstrate that the I8 module is necessary and sufficient forTG2-binding in vitro, but does not have functional effects on TG2-expressing cells.Modules I7 and I9 increase the strength of the binding and are required for cell adhesion. A 15-kDa fragment encompassing modules I7-9 behaves as the whole 45-kDa GBD and mediates signaling, adhesion, spreading, and migration of TG2
+ cells.Thisstudy providesnewinsights into themechanismforTG2binding toFN.
KW - cell adhesion
KW - extracellular matrix
KW - gelatin binding domain (GBD)
KW - ovarian cancer
UR - https://www.fasebj.org/doi/10.1096/fj.201800054RRR
UR - http://www.scopus.com/inward/record.url?scp=85061046523&partnerID=8YFLogxK
U2 - 10.1096/fj.201800054RRR
DO - 10.1096/fj.201800054RRR
M3 - Article
SN - 0892-6638
VL - 33
SP - 2327
EP - 2342
JO - FASEB Journal
JF - FASEB Journal
IS - 2
ER -