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001-es BibID:	BIBFORM056930
Első szerző:	Tóth László (vegyész)
Cím:	Dynamic properties of the native free antithrombin from molecular dynamics simulations : computational evidence for solvent- exposed Arg393 side chain / László Tóth, Attila Fekete, Gábor Balogh, Zsuzsanna Bereczky, István Komáromi
Dátum:	2015
ISSN:	0739-1102
Megjegyzések:	While antithrombin (AT) has small basal inhibitory activity, it reaches its full inhibitory potential against activated blood coagulation factors, FXa, FIXa, and FIIa (thrombin), via an allosteric and/or template (bridging) mechanism by the action of heparin, heparan sulfate, or heparin-mimetic pentasaccharides (PS). From the numerous X-ray structures available for different conformational states of AT, only indirect and incomplete conclusions can be drawn on the inherently dynamic properties of AT. As a typical example, the basal inhibitory activity of AT cannot be interpreted on the basis of "non-activated" free antithrombin X-ray structures since the Arg393 side chain, playing crucial role in antithrombin-proteinase interaction, is not exposed. In order to reveal the intrinsic dynamic properties and the reason of basal inhibitory activity of antithrombin, 2 ?s molecular dynamics simulations were carried out on its native free-forms. It was shown from the simulation trajectories that the reactive center loop which is functioning as "bait" for proteases, even without any biasing potential can populate conformational state in which the Arg393 side chain is solvent exposed. It is revealed from the trajectory analysis that the peptide sequences correspond to the helix D extension, and new helix P formation can be featured with especially large root-mean-square fluctuations. Mutual information analyses of the trajectory showed remarkable (generalized) correlation between those regions of antithrombin which changed their conformations as the consequence of AT-PS complex formation. This suggests that allosteric information propagation pathways are present even in the non-activated native form of AT.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban allostery antithrombin fluctuation generalized correlation molecular dynamics simulation principal component analysis reactive center loop serpin structure
Megjelenés:	Journal of Biomolecular Structure & Dynamics. - 33 : 9 (2015), p. 2023-2036. -
További szerzők:	Fekete Attila (1983-) (vegyész) Balogh Gábor (1991-) (gyógyszerész) Bereczky Zsuzsanna (1974-) (orvosi laboratóriumi diagnosztika szakorvos) Komáromi István (1957-) (vegyész, molekuláris biológus, biokémikus)
Pályázati támogatás:	K-106294 OTKA K-105459 OTKA PD-101120 OTKA TÁMOP-4.2.2.A-11/1/KONV-2012-0045 TÁMOP Trombózis Kutató Központ Kutatócsoport TÁMOP 4.2.4.A/2- 11-1-2012-0001 TÁMOP TAMOP-4.2.2.C-11/1/KONV-2012- 0010.1. TÁMOP NIIF-1057 Egyéb
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