TY  - JOUR
AU  - Susec, Maja
AU  - Senćanski, Milan V.
AU  - Glišić, Sanja
AU  - Veljković, Nevena V.
AU  - Pedersen, Christina
AU  - Drinovec, Luka
AU  - Stojan, Jurij
AU  - Nøhr, Jane
AU  - Vrecl, Milka
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8490
AB  - This study aimed to functionally characterize β2-adrenergic (β2AR) and insulin receptor (IR) heteromers in regard to β-arrestin 2 (βarr2) recruitment and cAMP signaling and to examine the involvement of the cytoplasmic portion of the IR β chain in heteromerization with β2AR. Evidence for β2AR:IR:βarr2 complex formation and the specificity of the IR:βarr2 interaction was first provided by bioinfomatics analysis. Receptor-heteromer investigation technology (HIT) then provided functional evidence of β2AR:IR heterodimerization by showing isoproterenol-induced but not insulin-induced GFP2-βarr2 recruitment to the β2AR:IR complex; the IR:βarr2 interaction was found to only be constitutive. The constitutive IR:βarr2 BRET signal (BRETconst) was significantly smaller in cells coexpressing IR-RLuc8 and a GFP2-βarr2 1–185 mutant lacking the proposed IR binding domain. β2AR:IR heteromerization also influenced the pharmacological phenotype of β2AR, i.e., its efficacy in recruiting βarr2 and activating cAMP signaling. Evidence suggesting involvement of the cytoplasmic portion of the IR β chain in the interaction with β2AR was provided by BRET2 saturation and HIT assays using an IR 1–1271 stop mutant lacking the IR C-terminal tail region. For the complex consisting of IR 1–1271–RLuc8:β2AR-GFP2, saturation was not reached, most likely reflecting random collisions between IR 1–1271 and β2AR. Furthermore, in the HIT assay, no substantial agonist-induced increase in the BRET2 signal was detected that would be indicative of βarr2 recruitment to the IR 1–1271:β2AR heteromer. Complementary 3D visualization of β2AR:IR provided supporting evidence for stability of the heterotetramer complex and identified amino acid residues involved in β2AR:IR heteromerization. © 2019
T2  - Neuropharmacology
T1  - Functional characterization of β2-adrenergic and insulin receptor heteromers
VL  - 152
SP  - 78
EP  - 89
DO  - 10.1016/j.neuropharm.2019.01.025
ER  - 

@article{
author = "Susec, Maja and Senćanski, Milan V. and Glišić, Sanja and Veljković, Nevena V. and Pedersen, Christina and Drinovec, Luka and Stojan, Jurij and Nøhr, Jane and Vrecl, Milka",
year = "2019",
abstract = "This study aimed to functionally characterize β2-adrenergic (β2AR) and insulin receptor (IR) heteromers in regard to β-arrestin 2 (βarr2) recruitment and cAMP signaling and to examine the involvement of the cytoplasmic portion of the IR β chain in heteromerization with β2AR. Evidence for β2AR:IR:βarr2 complex formation and the specificity of the IR:βarr2 interaction was first provided by bioinfomatics analysis. Receptor-heteromer investigation technology (HIT) then provided functional evidence of β2AR:IR heterodimerization by showing isoproterenol-induced but not insulin-induced GFP2-βarr2 recruitment to the β2AR:IR complex; the IR:βarr2 interaction was found to only be constitutive. The constitutive IR:βarr2 BRET signal (BRETconst) was significantly smaller in cells coexpressing IR-RLuc8 and a GFP2-βarr2 1–185 mutant lacking the proposed IR binding domain. β2AR:IR heteromerization also influenced the pharmacological phenotype of β2AR, i.e., its efficacy in recruiting βarr2 and activating cAMP signaling. Evidence suggesting involvement of the cytoplasmic portion of the IR β chain in the interaction with β2AR was provided by BRET2 saturation and HIT assays using an IR 1–1271 stop mutant lacking the IR C-terminal tail region. For the complex consisting of IR 1–1271–RLuc8:β2AR-GFP2, saturation was not reached, most likely reflecting random collisions between IR 1–1271 and β2AR. Furthermore, in the HIT assay, no substantial agonist-induced increase in the BRET2 signal was detected that would be indicative of βarr2 recruitment to the IR 1–1271:β2AR heteromer. Complementary 3D visualization of β2AR:IR provided supporting evidence for stability of the heterotetramer complex and identified amino acid residues involved in β2AR:IR heteromerization. © 2019",
journal = "Neuropharmacology",
title = "Functional characterization of β2-adrenergic and insulin receptor heteromers",
volume = "152",
pages = "78-89",
doi = "10.1016/j.neuropharm.2019.01.025"
}

Susec, M., Senćanski, M. V., Glišić, S., Veljković, N. V., Pedersen, C., Drinovec, L., Stojan, J., Nøhr, J.,& Vrecl, M.. (2019). Functional characterization of β2-adrenergic and insulin receptor heteromers. in Neuropharmacology, 152, 78-89.
https://doi.org/10.1016/j.neuropharm.2019.01.025

Susec M, Senćanski MV, Glišić S, Veljković NV, Pedersen C, Drinovec L, Stojan J, Nøhr J, Vrecl M. Functional characterization of β2-adrenergic and insulin receptor heteromers. in Neuropharmacology. 2019;152:78-89.
doi:10.1016/j.neuropharm.2019.01.025 .

Susec, Maja, Senćanski, Milan V., Glišić, Sanja, Veljković, Nevena V., Pedersen, Christina, Drinovec, Luka, Stojan, Jurij, Nøhr, Jane, Vrecl, Milka, "Functional characterization of β2-adrenergic and insulin receptor heteromers" in Neuropharmacology, 152 (2019):78-89,
https://doi.org/10.1016/j.neuropharm.2019.01.025 . .

TY  - JOUR
AU  - Mandić, Maja
AU  - Drinovec, Luka
AU  - Glišić, Sanja
AU  - Veljković, Nevena V.
AU  - Nohr, Jane
AU  - Vrecl, Milka
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/216
AB  - Glucose metabolism is under the cooperative regulation of both insulin receptor (IR) and beta(2)-adrenergic receptor (beta(2)AR), which represent the receptor tyrosine kinases (RTKs) and seven transmembrane receptors (7TMRs), respectively. Studies demonstrating cross-talk between these two receptors and their endogenous coexpression have suggested their possible interactions. To evaluate the effect of IR and prospective heteromerization on beta(2)AR properties, we showed that IR coexpression had no effect on the ligand binding properties of beta(2)AR; however, IR reduced beta(2)AR surface expression and accelerated its internalization. Additionally, both receptors displayed a similar distribution pattern with a high degree of colocalization. To test the possible direct interaction between beta(2)AR and IR, we employed quantitative BRET 2 saturation and competition assays. Saturation assay data suggested constitutive beta(2)AR and IR homo-and heteromerization. Calculated acceptor/donor (AD(50)) values as a measure of the relative affinity for homo-and heteromer formation differed among the heteromers that could not be explained by a simple dimer model. In heterologous competition assays, a transient increase in the BRET2 signal with a subsequent hyperbolical decrease was observed, suggesting higher-order heteromer formation. To complement the BRET2 data, we employed the informational spectrum method (ISM), a virtual spectroscopy method to investigate protein-protein interactions. Computational peptide scanning of beta(2)AR and IR identified intracellular domains encompassing residues at the end of the 7th TM domain and C-terminal tail of beta(2)AR and a cytoplasmic part of the IR beta chain as prospective interaction domains. ISM further suggested a high probability of heteromer formation and homodimers as basic units engaged in heteromerization. In summary, our data suggest direct interaction and higher-order beta(2)AR: IR oligomer formation, likely comprising heteromers of homodimers.
T2  - PLOS One
T1  - Demonstration of a Direct Interaction between beta(2)-Adrenergic Receptor and Insulin Receptor by BRET and Bioinformatics
VL  - 9
IS  - 11
DO  - 10.1371/journal.pone.0112664
ER  - 

@article{
author = "Mandić, Maja and Drinovec, Luka and Glišić, Sanja and Veljković, Nevena V. and Nohr, Jane and Vrecl, Milka",
year = "2014",
abstract = "Glucose metabolism is under the cooperative regulation of both insulin receptor (IR) and beta(2)-adrenergic receptor (beta(2)AR), which represent the receptor tyrosine kinases (RTKs) and seven transmembrane receptors (7TMRs), respectively. Studies demonstrating cross-talk between these two receptors and their endogenous coexpression have suggested their possible interactions. To evaluate the effect of IR and prospective heteromerization on beta(2)AR properties, we showed that IR coexpression had no effect on the ligand binding properties of beta(2)AR; however, IR reduced beta(2)AR surface expression and accelerated its internalization. Additionally, both receptors displayed a similar distribution pattern with a high degree of colocalization. To test the possible direct interaction between beta(2)AR and IR, we employed quantitative BRET 2 saturation and competition assays. Saturation assay data suggested constitutive beta(2)AR and IR homo-and heteromerization. Calculated acceptor/donor (AD(50)) values as a measure of the relative affinity for homo-and heteromer formation differed among the heteromers that could not be explained by a simple dimer model. In heterologous competition assays, a transient increase in the BRET2 signal with a subsequent hyperbolical decrease was observed, suggesting higher-order heteromer formation. To complement the BRET2 data, we employed the informational spectrum method (ISM), a virtual spectroscopy method to investigate protein-protein interactions. Computational peptide scanning of beta(2)AR and IR identified intracellular domains encompassing residues at the end of the 7th TM domain and C-terminal tail of beta(2)AR and a cytoplasmic part of the IR beta chain as prospective interaction domains. ISM further suggested a high probability of heteromer formation and homodimers as basic units engaged in heteromerization. In summary, our data suggest direct interaction and higher-order beta(2)AR: IR oligomer formation, likely comprising heteromers of homodimers.",
journal = "PLOS One",
title = "Demonstration of a Direct Interaction between beta(2)-Adrenergic Receptor and Insulin Receptor by BRET and Bioinformatics",
volume = "9",
number = "11",
doi = "10.1371/journal.pone.0112664"
}

Mandić, M., Drinovec, L., Glišić, S., Veljković, N. V., Nohr, J.,& Vrecl, M.. (2014). Demonstration of a Direct Interaction between beta(2)-Adrenergic Receptor and Insulin Receptor by BRET and Bioinformatics. in PLOS One, 9(11).
https://doi.org/10.1371/journal.pone.0112664

Mandić M, Drinovec L, Glišić S, Veljković NV, Nohr J, Vrecl M. Demonstration of a Direct Interaction between beta(2)-Adrenergic Receptor and Insulin Receptor by BRET and Bioinformatics. in PLOS One. 2014;9(11).
doi:10.1371/journal.pone.0112664 .

Mandić, Maja, Drinovec, Luka, Glišić, Sanja, Veljković, Nevena V., Nohr, Jane, Vrecl, Milka, "Demonstration of a Direct Interaction between beta(2)-Adrenergic Receptor and Insulin Receptor by BRET and Bioinformatics" in PLOS One, 9, no. 11 (2014),
https://doi.org/10.1371/journal.pone.0112664 . .