TY  - JOUR
AU  - Radibratović, Milica
AU  - Al-Hanish, Ayah
AU  - Minić, Simeon
AU  - Radomirović, Mirjana
AU  - Milčić, Miloš
AU  - Stanić-Vučinić, Dragana
AU  - Ćirković Veličković, Tanja
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3212
AB  - α-Lactalbumin (ALA) is a Ca2+-binding protein which constitutes up to 20% of whey protein. At acidic pH, and in the apo-state at elevated temperatures, ALA is the classic 'molten globule' (MG). This study examined epigallocatechin-3-gallate (EGCG) binding to ALA in its apo form (apoALA) and stabilizing effect on protein structure thereof.

EGCG binds to apoALA in both native and MG state. The complex of EGCG and ALA is more stable to thermal denaturation. The docking analysis and molecular dynamic simulation (MDS) showed that Ca2+ removal decreased conformational stability of ALA, because of the local destabilization of Ca2+-binding region. EGCG binding to apoALA increases its stability by reverting of conformation and stability of Ca2+-binding region. Therefore, EGCG-induced thermal stability of apoALA is based on increased apoALA conformational rigidity. This study implies that during gastric digestion of tea with milk EGCG would remain bound to ALA, albeit in the Ca2+-free form
PB  - Elsevier
T2  - Food Chemistry
T1  - Stabilization of apo α-lactalbumin by binding of epigallocatechin-3-gallate: Experimental and molecular dynamics study
VL  - 278
SP  - 388
EP  - 395
DO  - 10.1016/j.foodchem.2018.11.038
ER  - 

@article{
author = "Radibratović, Milica and Al-Hanish, Ayah and Minić, Simeon and Radomirović, Mirjana and Milčić, Miloš and Stanić-Vučinić, Dragana and Ćirković Veličković, Tanja",
year = "2019",
abstract = "α-Lactalbumin (ALA) is a Ca2+-binding protein which constitutes up to 20% of whey protein. At acidic pH, and in the apo-state at elevated temperatures, ALA is the classic 'molten globule' (MG). This study examined epigallocatechin-3-gallate (EGCG) binding to ALA in its apo form (apoALA) and stabilizing effect on protein structure thereof.

EGCG binds to apoALA in both native and MG state. The complex of EGCG and ALA is more stable to thermal denaturation. The docking analysis and molecular dynamic simulation (MDS) showed that Ca2+ removal decreased conformational stability of ALA, because of the local destabilization of Ca2+-binding region. EGCG binding to apoALA increases its stability by reverting of conformation and stability of Ca2+-binding region. Therefore, EGCG-induced thermal stability of apoALA is based on increased apoALA conformational rigidity. This study implies that during gastric digestion of tea with milk EGCG would remain bound to ALA, albeit in the Ca2+-free form",
publisher = "Elsevier",
journal = "Food Chemistry",
title = "Stabilization of apo α-lactalbumin by binding of epigallocatechin-3-gallate: Experimental and molecular dynamics study",
volume = "278",
pages = "388-395",
doi = "10.1016/j.foodchem.2018.11.038"
}

Radibratović, M., Al-Hanish, A., Minić, S., Radomirović, M., Milčić, M., Stanić-Vučinić, D.,& Ćirković Veličković, T.. (2019). Stabilization of apo α-lactalbumin by binding of epigallocatechin-3-gallate: Experimental and molecular dynamics study. in Food Chemistry
Elsevier., 278, 388-395.
https://doi.org/10.1016/j.foodchem.2018.11.038

Radibratović M, Al-Hanish A, Minić S, Radomirović M, Milčić M, Stanić-Vučinić D, Ćirković Veličković T. Stabilization of apo α-lactalbumin by binding of epigallocatechin-3-gallate: Experimental and molecular dynamics study. in Food Chemistry. 2019;278:388-395.
doi:10.1016/j.foodchem.2018.11.038 .

Radibratović, Milica, Al-Hanish, Ayah, Minić, Simeon, Radomirović, Mirjana, Milčić, Miloš, Stanić-Vučinić, Dragana, Ćirković Veličković, Tanja, "Stabilization of apo α-lactalbumin by binding of epigallocatechin-3-gallate: Experimental and molecular dynamics study" in Food Chemistry, 278 (2019):388-395,
https://doi.org/10.1016/j.foodchem.2018.11.038 . .

TY  - CONF
AU  - Radibratović, Milica
AU  - Al-Hanish, Ayah
AU  - Minić, Simeon
AU  - Radomirović, Mirjana Ž.
AU  - Milčić, Miloš
AU  - Stanić-Vučinić, Dragana
AU  - Ćirković-Veličković, Tanja
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7462
AB  - α-Lactalbumin (ALA) is a small, acidic, Ca2+-binding protein that might constitute up to 20% of whey protein. ALA has several partially folded intermediate states. It is very attractive for studies of the properties and structure of intermediate molten globule-like states since at acidic pH and in the apo-state at elevated temperatures ALA is the classic ‘molten globule’.The aim of our study was to examine if epi-gallo-catechin-3-gallate (EGCG) binds to ALA in its Ca-depleted (apo-ALA) and less ordered states. Moreover we examined if the polyphenol binding can stabilize protein structure. The experimental investigation of EGCG binding and protein’s stability were supported by molecular dynamics data.Green tea catechin binds to apo-ALA in neutral and acidic conditions. Binding affinity determined by intrinsic fluorescence quenching is of a similar magnitude as to the holo form of the protein. The complex of EGCG and ALA at neutral conditions is more stable to thermal denaturation then protein alone. The stabilizing effect is more pronounced for apo-ALA than for the holo-ALA.The docking analysis and molecular dynamic simulation (MDS) showed that EGCG binds to apoALA at the same site as to holoALA, in the hydrophobic pocket at the entrance of cleft between α and β subdomains, remaining bound during MDS. Ca2+ removal results in decreased conformational stability of ALA, where local destabilization of Ca2+-binding region propagates to cleft, with its slight opening. EGCG binding to apo-ALA increases stability of ALA by reverting of conformation and stability of disturbed Ca2+-binding region, which is transmitted to cleft, resulting in rejoining of α and β subdomains and slight cleft closing by the same mechanism. EGCG binding could retard transition of apo-ALA to less ordered states under conditions favoring its formation.Therefore, non-covalent binding of EGCG can stabilize structural fold of calcium-depleted ALA.
PB  - Univerzitet u Beogradu
C3  - UNIFOOD Conference, Belgrade, Serbia, 5th–6th October, 2018. In: UNIFOOD Conference - Programme and Book of Abstracts
T1  - Stabilization of apo-alpha-lactalbumin by binding of epigallocatechin-3-gallate: experimental and molecular dynamics study
SP  - 268
EP  - 268
UR  - https://hdl.handle.net/21.15107/rcub_cer_7462
ER  - 

@conference{
author = "Radibratović, Milica and Al-Hanish, Ayah and Minić, Simeon and Radomirović, Mirjana Ž. and Milčić, Miloš and Stanić-Vučinić, Dragana and Ćirković-Veličković, Tanja",
year = "2018",
abstract = "α-Lactalbumin (ALA) is a small, acidic, Ca2+-binding protein that might constitute up to 20% of whey protein. ALA has several partially folded intermediate states. It is very attractive for studies of the properties and structure of intermediate molten globule-like states since at acidic pH and in the apo-state at elevated temperatures ALA is the classic ‘molten globule’.The aim of our study was to examine if epi-gallo-catechin-3-gallate (EGCG) binds to ALA in its Ca-depleted (apo-ALA) and less ordered states. Moreover we examined if the polyphenol binding can stabilize protein structure. The experimental investigation of EGCG binding and protein’s stability were supported by molecular dynamics data.Green tea catechin binds to apo-ALA in neutral and acidic conditions. Binding affinity determined by intrinsic fluorescence quenching is of a similar magnitude as to the holo form of the protein. The complex of EGCG and ALA at neutral conditions is more stable to thermal denaturation then protein alone. The stabilizing effect is more pronounced for apo-ALA than for the holo-ALA.The docking analysis and molecular dynamic simulation (MDS) showed that EGCG binds to apoALA at the same site as to holoALA, in the hydrophobic pocket at the entrance of cleft between α and β subdomains, remaining bound during MDS. Ca2+ removal results in decreased conformational stability of ALA, where local destabilization of Ca2+-binding region propagates to cleft, with its slight opening. EGCG binding to apo-ALA increases stability of ALA by reverting of conformation and stability of disturbed Ca2+-binding region, which is transmitted to cleft, resulting in rejoining of α and β subdomains and slight cleft closing by the same mechanism. EGCG binding could retard transition of apo-ALA to less ordered states under conditions favoring its formation.Therefore, non-covalent binding of EGCG can stabilize structural fold of calcium-depleted ALA.",
publisher = "Univerzitet u Beogradu",
journal = "UNIFOOD Conference, Belgrade, Serbia, 5th–6th October, 2018. In: UNIFOOD Conference - Programme and Book of Abstracts",
title = "Stabilization of apo-alpha-lactalbumin by binding of epigallocatechin-3-gallate: experimental and molecular dynamics study",
pages = "268-268",
url = "https://hdl.handle.net/21.15107/rcub_cer_7462"
}

Radibratović, M., Al-Hanish, A., Minić, S., Radomirović, M. Ž., Milčić, M., Stanić-Vučinić, D.,& Ćirković-Veličković, T.. (2018). Stabilization of apo-alpha-lactalbumin by binding of epigallocatechin-3-gallate: experimental and molecular dynamics study. in UNIFOOD Conference, Belgrade, Serbia, 5th–6th October, 2018. In: UNIFOOD Conference - Programme and Book of Abstracts
Univerzitet u Beogradu., 268-268.
https://hdl.handle.net/21.15107/rcub_cer_7462

Radibratović M, Al-Hanish A, Minić S, Radomirović MŽ, Milčić M, Stanić-Vučinić D, Ćirković-Veličković T. Stabilization of apo-alpha-lactalbumin by binding of epigallocatechin-3-gallate: experimental and molecular dynamics study. in UNIFOOD Conference, Belgrade, Serbia, 5th–6th October, 2018. In: UNIFOOD Conference - Programme and Book of Abstracts. 2018;:268-268.
https://hdl.handle.net/21.15107/rcub_cer_7462 .

Radibratović, Milica, Al-Hanish, Ayah, Minić, Simeon, Radomirović, Mirjana Ž., Milčić, Miloš, Stanić-Vučinić, Dragana, Ćirković-Veličković, Tanja, "Stabilization of apo-alpha-lactalbumin by binding of epigallocatechin-3-gallate: experimental and molecular dynamics study" in UNIFOOD Conference, Belgrade, Serbia, 5th–6th October, 2018. In: UNIFOOD Conference - Programme and Book of Abstracts (2018):268-268,
https://hdl.handle.net/21.15107/rcub_cer_7462 .